For Flaw Or Discontinuity Detection Patents (Class 73/598)
  • Patent number: 6810743
    Abstract: The present invention uses the generation and detection of acoustic guided waves to evaluate the condition of the insulation on electrical wiring. Low order axisymmetric and flexural acoustic modes are generated in the insulated wire and travel partially in the center conductor and partially in the outer insulation. The stiffness of the insulation and the insulation's condition affect the overall wave speed and amplitude of the guided wave. Analysis of the received signal provides information about the age or useful life of the wire insulation. In accordance with the present invention, signal transmission occurs at one location on the electrical wire to be evaluated, and detection occurs at one or more locations along the electrical wire. Additional receivers can be used to improve measurement accuracy. Either the transmission transducer or one or more receiver transducers may be angled at other than 90 degrees to the wire.
    Type: Grant
    Filed: August 1, 2002
    Date of Patent: November 2, 2004
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Adminstration
    Inventors: Eric I. Madaras, Robert F. Anastasi
  • Patent number: 6810742
    Abstract: The speed of sound c is determined in a material as a function of the temperature T by heating an end of an elongated sample body of the material of the temperature and determining the time difference for the receipt of echoes from two reflective zones at the heated end. The opposite end of the body is cooled in a water bath which can couple an ultrasonic test head to the body.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: November 2, 2004
    Assignee: SMS Meer GmbH
    Inventor: Martin Sauerland
  • Patent number: 6796184
    Abstract: A method and system for determining meat quality in cattle is provided. In preferred embodiments the method comprises obtaining an ultrasound measurement of a cattle specimen between the 12th rib and 13th rib at weaning age. The ultrasound measurement is utilized to extrapolate a harvest quality parameter. Based on the harvest quality parameter, and preferably a yield grade, the specimen is categorized. Particularly preferred harvest quality parameters are ribeye area, fat thickness, intramuscular fat and ribeye shape. Method for determining tenderness, stress and intramuscular fat are described and claimed.
    Type: Grant
    Filed: July 9, 2003
    Date of Patent: September 28, 2004
    Inventor: Rethel C. King
  • Patent number: 6799126
    Abstract: A nondestructive inspection method for composite structures, including thick core structures, is disclosed that imparts a vibration force into the structure and analyzes the response over a range of frequencies to find possible damaged areas. The composite structure is struck to induce vibration at a series of test points and the response of the composite structure as a function of acceleration at each test point is measured. The structural anomalies in the composite structure occur at structural stiffness irregularities near anomalies and are detected with a Gapped Smoothing Method operating on the data and plotting a structural irregularity index as a function of frequency and position.
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: September 28, 2004
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Colin P. Ratcliffe, Roger M. Crane
  • Publication number: 20040182160
    Abstract: The present invention uses the generation and detection of acoustic guided waves to evaluate the condition of the insulation on electrical wiring. Low order axisymmetric and flexural acoustic modes are generated in the insulated wire and travel partially in the center conductor and partially in the outer insulation. The stiffness of the insulation and the insulation's condition affect the overall wave speed and amplitude of the guided wave. Analysis of the received signal provides information about the age or useful life of the wire insulation. In accordance with the present invention, signal transmission occurs at one location on the electrical wire to be evaluated, and detection occurs at one or more locations along the electrical wire. Additional receivers can be used to improve measurement accuracy. Either the transmission transducer or one or more receiver transducers may be angled at other than 90 degrees to the wire.
    Type: Application
    Filed: August 1, 2002
    Publication date: September 23, 2004
    Inventors: Eric I. Madaras, Robert F. Anastasi
  • Publication number: 20040177681
    Abstract: An inspection apparatus includes an inspection unit that is lowered into vertically supported pipe filled with seawater. The apparatus includes a pipe weld location detector module carried by the inspection unit. The apparatus also includes a rotating time of flight diffusion (TOFD) module and a non-rotating wall thickness module carried by the inspection unit. The module includes a pair of rotatably mounted weld volume inspection transducers rotatable by an operator and adapted to inspect for and obtain data on weld volume defects. The TOFD module has a fluid carrier positioned within the TOFD module and contains an acoustic fluid. The non-rotating wall thickness module also contains an acoustic liquid and includes a plurality of fixedly mounted wall inspection transducers adapted to obtain data on wall thickness of a portion of the pipe.
    Type: Application
    Filed: March 22, 2004
    Publication date: September 16, 2004
    Inventors: Larry K. Harthorn, Christopher B. Disher
  • Patent number: 6786096
    Abstract: A system and technique for detecting the presence of foreign material is presented. An ultrasound transmitter interrogates the bulk material and an array of detectors receives the off angle ultrasound scattering response of the bulk material. The presence of foreign material is determined when the off angle scattering response exceeds a predetermined threshold. The technique is especially suitable for the detection of bone in meat.
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: September 7, 2004
    Assignee: Battelle Memorial Institute
    Inventors: Leonard J. Bond, Aaron A. Diaz, Richard A. Pappas, Timothy Stewart
  • Patent number: 6777931
    Abstract: The testing results, etc. of surface flaws such as cracks formed in or just below a surface of a body to be detected are displayed using colors within different color regions in the color space when displaying, on the basis of a preset threshold value, the test signal ranging in magnitude from zero to the threshold value and the test signal falling in magnitude beyond the threshold value while changing the color and/or the depth of color little by little within each of the color regions according to the magnitude of the test signal. This enables small flaw signals, etc. to be displayed without exception, thereby preventing small flaws, etc. from being overlooked.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: August 17, 2004
    Assignee: Kawasaki Steel Corporation
    Inventors: Hajime Takada, Ryouichi Sugimoto, Ikuo Yarita
  • Patent number: 6772633
    Abstract: Described herein is a technology for facilitating diagnosis of the operation of devices or machines based, at least in part, upon the acoustics of such.
    Type: Grant
    Filed: December 11, 2002
    Date of Patent: August 10, 2004
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: James P. Terry, William W. Uhl
  • Patent number: 6772092
    Abstract: A computer program for correlating coatings' material usage and cost impact with coatings ranges evaluated against an industry Cpk standard. Optimum range values are selected from the process and/or coatings applicators' manufacturer guidelines.
    Type: Grant
    Filed: January 14, 2002
    Date of Patent: August 3, 2004
    Inventor: Stephen N. Gaiski
  • Patent number: 6755080
    Abstract: Methods and apparatus for atmospheric sounding using acoustic chirps are disclosed, the transmitted and echo chirps being compared in a mixer that yields frequency sums and differences. Preferably, the mixing is performed as a complex multiplication in the Fourier domain. In one system (1) a signal generator (5) such as a PC sound card drives a loudspeaker (3) that serves as a transmitter and echo pulses are detedcted by a microphone (4) that serves as a receiver. Chirps transmitted by the loudspeaker (3) travel by different paths (7a and 7b) due to reflection from TILS or thermal inversion layers (2a and 2b) at different altitudes. The transmitted and echo chirp signals are compared in a mixer (6) from which various outputs (8 and 9) can be generated. One output (8) might be the magnitude of the difference between the transmitted and echo chirp tones, instant by instant, which is indicative of the altitudes of the respective TILs.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: June 29, 2004
    Assignee: Tele-IP Limited
    Inventor: Andrew Louis Martin
  • Patent number: 6739195
    Abstract: A flexible piezoelectric-based transducer, mounted on a circumference of a rotating object senses acoustical energy traversing portions of the object. In a preferred embodiment, the transducer is affixed, using a suitable adhesive, within the enclosed portion of a wheel/tire assembly. The transducer senses acoustical energy, e.g., ultrasonic transmissions, generated by the tire contacting the road surface at its contact patch and, without need of external power, translates it to an electrical current and communicates it for further processing. Because the acoustical impedance of the tire casing changes with temperature, hot spots within the tire, as well as other characteristics of the tire's operation, can be detected. Further, any Doppler shift which occurs due to the rotating medium may be compensated for since the rate of tire rotation may be made known via a speed sensor. A position sensor may also be employed to indicate the position of the hot spot.
    Type: Grant
    Filed: April 9, 2002
    Date of Patent: May 25, 2004
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: James A. Evans, George L. Mason
  • Patent number: 6739196
    Abstract: An improved method and apparatus for non-destructive cleanliness evaluation in sputter targets using radio frequency waveform phase change and amplitude detection is disclosed. The apparatus acquires phase change and amplitude for a plurality of data points. The method disclosed for characterizing the sputter target material (52) employs the phase change and amplitude magnitude data for calculating cleanliness factors and generating pareto histograms.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: May 25, 2004
    Assignee: Tosoh SMD, Inc.
    Inventor: Alexander Leybovich
  • Patent number: 6715354
    Abstract: A flaw detection system using acoustic Doppler effect for detecting flaws in a medium wherein there is relative motion between the medium and system includes a transducer, spaced from the medium to be inspected, for introducing to and sensing from the medium an acoustic signal that propagates in the medium at a predetermined frequency; and a detector, responsive to the sensed propagating acoustic signal, for detecting in the sensed acoustic signal the Doppler shifted frequency representative of a flaw in the medium.
    Type: Grant
    Filed: February 24, 1998
    Date of Patent: April 6, 2004
    Assignee: Massachusetts Institute of Technology
    Inventor: Shi-Chang Wooh
  • Patent number: 6698289
    Abstract: The invention relates to a device for distance measurement, comprising a transmission element (9) for emitting pulsed acoustic or electromagnetic waves. Said transmission element is provided at a first end of a distance (L) or at a known distance from said first end. The device contains a receiving element (13) for the emitted waves. Said receiving element (13) receives said waves at a second end of the distance (L) or, after reflection at the second end, at the first end. An evaluation and control unit (11) calculates the distance (L) from the running time and the signal speed. According to the invention, a telescope tube (3) with two engaging tube elements (5, 7) is used between the first and second end. The transmission element (9) and the receiving element (13) are arranged on the tube elements (5, 7) respectively or are coupled thereto via waveguides. One of the tube elements can also be coupled to a displaceable element which can change location.
    Type: Grant
    Filed: October 16, 2001
    Date of Patent: March 2, 2004
    Assignee: TRW Automotive Electronics & Components GmbH & Co. KG
    Inventors: Sören Lemcke, Peter Hora
  • Patent number: 6691575
    Abstract: All independent acoustical physical constants (elastic constants, piezoelectric constants, dielectric constants and density) of a material are predetermined as a function of its chemical composition, and the calibration line between the acoustic velocity for each of the substrate crystal plane, the propagation direction and the propagation mode, and other chemical and physical properties is numerically calculated with ease without making any experiments.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: February 17, 2004
    Inventors: Jun-ichi Kushibiki, Izumi Watanabe, Yuji Ohashi
  • Patent number: 6684705
    Abstract: The present invention provides a method, system, and an apparatus for detecting anomalies in a wooden member. The apparatus includes a first roller device comprising a first array of transducers, and a second roller device comprising a second array of transducers. A first transducer in the first array of transducers communicates with more than one transducer in the second array of transducers. The apparatus may be designed such that the wooden member may pass between the first roller device and the second roller device. In addition, the first array of transducers and the second array of transducers maintain an orientation perpendicular to the moving direction of the wooden member as the first roller device and the second roller device roll along the wooden member. Each of the transducers operate in an ultrasonic frequency range. Also, each transducer in the first array of transducers is acoustically isolated from each other transducer.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: February 3, 2004
    Assignee: U.S. Natural Resources, Inc.
    Inventors: Mark E. Schafer, Raymond W. McIntyre, Michael K. Knauer
  • Patent number: 6681632
    Abstract: Ultrasonic waves are produced at the surface of a thin metal sheet (27) welded to a substrate (28): it was noted that the speed of propagation of the surface waves could then be correlated to the resilience of the welded assembly to enable non-destructive monitoring.
    Type: Grant
    Filed: November 23, 2001
    Date of Patent: January 27, 2004
    Assignee: SNECMA Moteurs
    Inventors: Jean-Yves François Roger Chatellier, Daniel Sébastien Ramahefasolo
  • Patent number: 6679120
    Abstract: A method and system for detecting an underground obstacle in which a plurality of acoustic signal sensors are deployed in a predetermined pattern on an area of ground defined by a guided drill path. A drill head of a drill is inserted into the ground and a borehole is drilled in the ground along the guided drill path. The noise signal generated by the drill head is detected at at least two of the acoustic signal sensors and the difference in arrival time of the noise signal at the two acoustic signal sensors is determined. This difference in arrival time of noise signal is analyzed, whereby the presence or absence of an underground obstacle is determined.
    Type: Grant
    Filed: July 15, 2002
    Date of Patent: January 20, 2004
    Assignee: Gas Research Institute
    Inventors: Robert W. Cribbs, Ching-Chen Wu, Douglas G. Niessen
  • Publication number: 20040007070
    Abstract: A method and system for detecting an underground obstacle in which a plurality of acoustic signal sensors are deployed in a predetermined pattern on an area of ground defined by a guided drill path. A drill head of a drill is inserted into the ground and a borehole is drilled in the ground along the guided drill path. The noise signal generated by the drill head is detected at at least two of the acoustic signal sensors and the difference in arrival time of the noise signal at the two acoustic signal sensors is determined. This difference in arrival time of noise signal is analyzed, whereby the presence or absence of an underground obstacle is determined.
    Type: Application
    Filed: July 15, 2002
    Publication date: January 15, 2004
    Inventors: Robert W. Cribbs, Ching-Chen Wu, Douglas G. Niessen
  • Patent number: 6672162
    Abstract: While a transmitting transducer (2a) for transmitting an ultrasonic wave and a receiving transducer (2b) for receiving an ultrasonic wave are moved within a predetermined circular region (7) on a surface of a material being measured, ultrasonic waves are transmitted and received 10,000 times. Then, arithmetic averaging is performed every time an ultrasonic wave is received, on the ultrasonic wave and ultrasonic waves that have been received until then. For example, the aforementioned predetermined frequency is given by ((n±(½))×(106×v/&Dgr;L))(Hz), where &Dgr;L is a variation in distance between the transmitting transducer and the receiving transducer, v is a transmission velocity of an ultrasonic wave transmitting in a material being detected, and n is a natural number.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: January 6, 2004
    Assignee: H & B System Co. Ltd.
    Inventor: Masayuki Hirose
  • Patent number: 6672164
    Abstract: A process for determining the polymer concentration in a spinning dope solution involves measuring the propagation velocity of ultrasonic sound in the solution. The process prevents fluctuations in the polymer concentration as much as possible, and is therefore highly suitable for application in the production of fibers with consistent properties. An ultrasonic device used in the process is easier to clean, install, and calibrate than other presently commercially available devices.
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: January 6, 2004
    Assignee: Teijin Twaron B.V.
    Inventors: Willem G. Haanstra, Hendrikus J. M. Busschers, Hans Lammers
  • Patent number: 6644122
    Abstract: Ultrasonic sensors can be integrated and used to monitor composites throughout their production and during their useful lifetime. In an integrated program, ultrasonic sensors, in the illustrated embodiment contact sensors, can be used for quality control on raw rubber used for making a composite and for monitoring the cure of the rubber as it is transformed into a useful product, and non-contact sensors can be used to evaluate the product when it is completed, and to monitor its aging and wear during use. Such sensors can also be used in research to evaluate potential raw materials, and to compare cured candidate materials for properties useful in a completed product.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: November 11, 2003
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Marc Borowczak, Aaron Scott Puhala, Ran Ding, Fredrick Lewis Magnus, Blake Edward Matthies
  • Patent number: 6640632
    Abstract: In the ultrasonic flaw detection method and apparatus, wideband longitudinal ultrasonic waves are irradiated from an ultrasonic wave generator probe onto a weld portion of a coarse grained material; from the waveforms of flaw detection echoes that are subsequently obtained, the highest frequency component that can be extracted using time frequency analysis is then extracted; subsequent ½ magnification frequency components are then extracted sequentially; waveforms of a necessary plurality of frequency bands from among each of the frequency bands that were extracted and have undergone waveform separation are then multiplied, and waveform peaks that are formed by the multiplication are detected as being defect portion echoes generated by defect portions in the coarse grained material weld portion; and, as a result, information on the defect portion is obtained from the detected defect portion echo.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: November 4, 2003
    Assignee: Ishikawajima-Harima Heavy Industries Co., Ltd.
    Inventors: Hiroaki Hatanaka, Saburo Shibata, Takahiro Arakawa
  • Patent number: 6629463
    Abstract: These objects are achieved by a method of acoustically inspecting a one-piece bladed wheel in which the wheel is driven in rotation; each blade of the wheel is subjected to mechanical excitation; its acoustic response is picked up and a corresponding electrical signal is generated; its frequency response is determined by computing a FFT; the electrical signal and the associated frequency response are stored; the characteristic frequencies of each blade of the wheel are identified; and a wheel is rejected or accepted depending on whether or not the frequency distribution obtained in this way matches a predetermined set of forbidden frequency distributions. Advantageously, an additional step is provided in which the defects of a blade are determined by comparing its frequency response with predetermined frequency responses that are characteristic of various types of defect.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: October 7, 2003
    Assignee: Snecma Moteurs
    Inventors: Jacky Naudet, Jean-Luc Mary, André Collot, Marc Berthillier
  • Patent number: 6606909
    Abstract: An invention to measure of objects of non-homogeneous ultrasonic impedance in the testing path is provided to detect the present of flaws in any part of the object. The invention utilized a reference signal to compare against the actual signal derived from ultrasonic testing of the object. Reference signals are determined based upon the known or calculated properties of the object's layers or previously obtained signals measured from the object.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: August 19, 2003
    Assignee: Lockheed Martin Corporation
    Inventors: Marc Dubois, Peter William Lorraine
  • Patent number: 6595060
    Abstract: A method for determining structural inhomogeneities in sheet material including exposing sheet material to ultrasonic waves, measuring ultrasonic waves transmitted through the sheet material and ultrasonic waves reflected from the sheet material at a plurality of predetermined portions located linearly along at least one track disposed on the sheet material and producing at least one value characteristic based on at least the transmitted or reflected ultrasonic waves from each of the predetermined portions on the at least one track. The method further includes forming a first mean based on the at least one value characteristic and a second mean based on the first mean to determine the structural inhomogeneities in the sheet material representative of the at least one track.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: July 22, 2003
    Assignee: Giesecke & Devrient GmbH
    Inventors: Bernd Wunderer, Ulrich Schanda
  • Patent number: 6595061
    Abstract: Ultrasonic energy in the form of guided waves (plate waves or Lamb waves) is launched into the wall of a container. The guided wave propagates around the circumference of the container from a transmitting transducer to a receiving transducer. Analysis of the received waves determines the presence of corrosion pitting and MIC nodules on the container inner wall, as well as the existence of foreign objects in intimate contact with the container wall. The guided waves are created with wideband transducers excited at certain frequencies that depend on the material and geometry of the part being measured. The guided wave ultrasonic energy is maximized with a shaped tone burst pulse at the specified frequency rather than an electrical spike commonly used to excite transducers in standard ultrasonic search units.
    Type: Grant
    Filed: January 23, 2002
    Date of Patent: July 22, 2003
    Assignee: Digital Wave Corporation
    Inventors: Michael R. Gorman, Steven M. Ziola
  • Publication number: 20030131674
    Abstract: A method of testing a wooden structural member provides a quantitive estimate of the residual strength of the member. The method includes determining the presence of anomalies in each of a plurality of intersecting transverse paths through the structural member at a tested cross section of the structural member. A unit cross section of corresponding shape to the tested cross section has a plurality of predefined regions. For each region of the plurality of regions a determination is made that the region is suspect if each of the paths intersecting at the region has indicated an anomaly. A residual stiffness property for the cross section is calculated discounting at least some of the suspect regions. The calculated residual stiffness property may be displayed together with a visual representation of the cross section of the wooden structural member with the suspect regions highlighted.
    Type: Application
    Filed: November 8, 2002
    Publication date: July 17, 2003
    Inventors: Alfred Denis Foley, Jeffry Paul Foley
  • Patent number: 6591680
    Abstract: A system and method that allows for the immersion ultrasonic inspection of test samples that cannot be immersed in a fluid (e.g., water) bath. A test sample is encapsulated in a sealed evacuated bag made of nonporous flexible material. A portion of the nonporous flexible material is in contact with the surface area of the test sample where the ultrasound wave or beam will impinge. Then the sealed bag with test sample inside are immersed in an acoustic coupling medium, as is an ultrasonic transducer. The transducer is directed to transmit an interrogating ultrasound wave or beam through the vacuum bag into the component being inspected at the area of interest. The sealed bag prevents contact between the inspected component and the acoustic coupling medium.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: July 15, 2003
    Assignee: General Electric Company
    Inventors: Thomas James Batzinger, Francis Alexander Reed
  • Publication number: 20030122682
    Abstract: A plurality of wires (33, 34; 35, 36) are disposed near the bottom (23-25) of blade root sockets (16-18) of a rotating disk 39 of a gas turbine engine by vapor deposition and etching, the wires including connections to excitation nodes (40, 42) and detection nodes (41, 43). A nearby stationary member of the engine mounts an oscillator amplifier (55) which drives a coil (57) that excites the circuitry, and a coil (62) drives an amplifier (65) and a processor (67) which provides an indication of whether or not one or more of the wires are broken by a crack.
    Type: Application
    Filed: December 28, 2001
    Publication date: July 3, 2003
    Inventors: Frank D. Gass, Gonzalo J. Rey
  • Patent number: 6584847
    Abstract: While a transmitting transducer (2a) for transmitting an ultrasonic wave and a receiving transducer (2b) for receiving an ultrasonic wave are moved within a predetermined circular region (7) on a surface of a material being measured, ultrasonic waves are transmitted and received 10,000 times. Then, arithmetic averaging is performed every time an ultrasonic wave is received, on the ultrasonic wave and ultrasonic waves that have been received until then. For example, the aforementioned predetermined frequency is given by ((n±(½))×(106×v/&Dgr;L))(Hz), where &Dgr;L is a variation in distance between the transmitting transducer and the receiving transducer, v is a transmission velocity of an ultrasonic wave transmitting in a material being detected, and n is a natural number.
    Type: Grant
    Filed: September 4, 2001
    Date of Patent: July 1, 2003
    Assignee: H & B System Co., Ltd.
    Inventor: Masayuki Hirose
  • Patent number: 6581472
    Abstract: In the present method for monitoring and controlling a screwing process in creating a screw connection, ultrasonic pulses are coupled into the screw using a pulse-echo method before and during the tightening of the screw. The time for the pulses to traverse the length of the screw, i.e., the propagation time, is measured. A dependency of the propagation time on the predetermined tension of the screw is calculated from the material specific characteristic values of the screw and the measured propagation time. By comparing the values of a change in propagation time dependent on a parameter of the screw with the values of a change in propagation time dependent on the predetermined tension of the screw, the screwing process can be monitored.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: June 24, 2003
    Assignee: Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Eckhardt Schneider, Rüdiger Herzer
  • Patent number: 6581466
    Abstract: A method for inspecting concrete structures includes the steps of exciting the structure to be inspected with a mechanical device such as a chain, sensing resulting vibrations with an acoustical sensor such as a microphone that is not physically coupled to the structure, processing the received signals to exclude signals with frequencies outside of response frequencies of interest corresponding to defects desired to be detected, and examining the received signals. In preferred embodiments, the mean square of the processed signals are compared to a threshold. Areas for which the total energy across the frequency bands of interest exceeds the threshold correspond to defects such as delaminations. The received signals are collected from various locations on the structure. In preferred embodiments, the location of the received signals is also maintained.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: June 24, 2003
    Assignee: Mississippi State University
    Inventors: R. Daniel Costley, Mark E. Henderson, Gary N. Dion
  • Patent number: 6553837
    Abstract: The invention relates to a process for analysis of roller bearings (15) which have been installed in machines, by means of a sensor (10) a signal being recorded which is produced by the rolling motion, and the signal amplitude is evaluated in order to determine the presence and optionally the depth of the damage in the roller bearing running surface (56). In doing so a dynamic model of the roller bearing in the machine is considered, in which at least the bilateral contact stiffnesses (4, 6) of the rolling elements are considered in order to determine the transfer function between the force caused by the damage and the corresponding sensor signal which is then taken into account in the signal amplitude evaluation. The invention furthermore relates to a corresponding analysis device.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: April 29, 2003
    Assignee: Pruftechnik Dieter Busch AG
    Inventor: Heinrich Lysen
  • Publication number: 20030037615
    Abstract: The present invention uses the generation and detection of acoustic guided waves to evaluate the condition of the insulation on electrical wiring. Low order axisymmetric and flexural acoustic modes are generated in the insulated wire and travel partially in the center conductor and partially in the outer insulation. The stiffness of the insulation and the insulation's condition affect the overall wave speed and amplitude of the guided wave. Analysis of the received signal provides information about the age or useful life of the wire insulation. In accordance with the present invention, signal transmission occurs at one location on the electrical wire to be evaluated, and detection occurs at one or more locations along the electrical wire. Additional receivers can be used to improve measurement accuracy. Either the transmission transducer or one or more receiver transducers may be angled at other than 90 degrees to the wire.
    Type: Application
    Filed: August 1, 2002
    Publication date: February 27, 2003
    Inventors: Eric I. Madaras, Robert F. Anastasi
  • Patent number: 6513564
    Abstract: A cleaving tool provides pressurized gas to the edge of a substrate in combination with a sharpened edge to cleave the substrate at a selected interface. The edge of the tool is tapped against the perimeter of a substrate, such as a bonded substrate, and a burst of gas pressure is then applied at approximately the point of contact with the edge of the tool. The combination of mechanical force and gas pressure separates the substrate into two halves at a selected interface, such as a weakened layer in a donor wafer.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: February 4, 2003
    Assignee: Silicon Genesis Corporation
    Inventors: Michael A. Bryan, James K. Kai
  • Publication number: 20020174722
    Abstract: The claimed method of in-tube ultrasonic flaw detection of pipelines is effected, in accordance with one embodiment, by placing inside a pipeline an inspection pig or flaw detector having ultrasonic transducers, devices for measurements, processing and storage of the measured data. During the pig travel, the transducers emit probing ultrasonic pulses and receive the reflected pulses corresponding to said probing pulse thus deriving data on the time intervals corresponding to the transit time of said pulses, the measured data being converted and stored.
    Type: Application
    Filed: May 13, 2002
    Publication date: November 28, 2002
    Inventors: Alexandr Jurievich Bazarov, Alexandr Petrovich Desyatchikov, Nikolai Alekseevich Karasev, Sergei Pavlovich Kirichenko, Andrei Mikhailovich Slepov, Anatoly Valentinovich Smirnov
  • Patent number: 6484581
    Abstract: A ultrasonic transceiver includes a case for housing a ultrasonic sensor having a transducer provided therein, and a resilient member to be interposed between the case and an ultrasonic sensor. The surface of the case opposing the side surface of the ultrasonic sensor is tapered with respect to the surface of the ultrasonic sensor without involvement of the resilient member.
    Type: Grant
    Filed: February 1, 2001
    Date of Patent: November 26, 2002
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yukio Nishimoto, Akiharu Fukuda
  • Patent number: 6481288
    Abstract: A method and apparatus for determining the speed of sound in a gas. An acoustic transmitter is arranged to apply an acoustic signal to the interior of a resonator and an acoustic receiver is arranged to detect the amplitude of the acoustic signal in the interior of the resonator. A control means determines the speed of sound of gas within the resonator from the frequency of a detected non-radial resonant mode.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: November 19, 2002
    Assignee: Lattice Intellectual Property Ltd.
    Inventors: Francis Alan Humphrey, David Byrne, Barry Leonard Price
  • Patent number: 6484121
    Abstract: A system is provided for automatically measuring paint film thickness of painted bodies for closed loop control of a paint process for painting the bodies in a paint booth. The system includes a cell for receiving painted bodies from the paint booth and a conveyor control system for controlling the movement of painted bodies between the paint booth and the cell. The system also includes an AutoPelt system communicating with the conveyor control system for measuring paint film thickness of the painted bodies in the cells. The system includes an integrated paint quality control (IPQC) monitoring system communicating with the AutoPelt system for receiving data of paint film thickness information and combining the paint film thickness information with automation parameters on a vehicle identification number (VIN) basis of the painted bodies to control paint automation equipment of the paint booth.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: November 19, 2002
    Assignee: Ford Global Technologies, Inc.
    Inventors: Dimitar P. Filev, Frank Migda, Gary Farquhar
  • Patent number: 6467352
    Abstract: Ultrasonic techniques are applied to the measurement of wooden members to detect splitting during sawing operations and thereby allow modification of a sawing technique or change in saw cut placement.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: October 22, 2002
    Assignees: Percepton, Inc., The United States of America as represented by the Secretary of Agriculture
    Inventors: Mark E. Schafer, Robert J. Ross
  • Patent number: 6450036
    Abstract: The invention is directed to a method and apparatus for diagnosing deterioration of an article having at least a covering layer made from an organic polymer material. The method comprises (i) forming a data group for deterioration diagnosis comprising deterioration diagnostic characteristic values and corresponding ultrasonic wave propagation characteristic values for samples having different material specifications, (ii) propagating an ultrasonic wave through the covering layer of the article to measure an ultrasonic wave propagation characteristic of the covering layer, and (iii) determining a corresponding deterioration diagnostic characteristic from the data group for the ultrasonic wave propagation characteristic of the covering layer.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: September 17, 2002
    Assignee: Mitsubishi Cable Industries, Ltd.
    Inventors: Tetsuya Ashida, Tsuyoshi Ikeda, Junichiro Ikehara, Masanori Fujii, Hiroshi Ishibashi, Yoshiro Habuka, Minoru Okamoto, Eiji Onuma, Hiroshi Kato
  • Patent number: 6446509
    Abstract: An ultrasonic testing method uses surface waves to prevent false detection of primary cracks, to lower the level of structural noises from grain boundaries, and to improve the detectability in the ultrasonic testing by surface wave testing of hot rolling rolls. A surface wave probe 10 capable of transmitting and receiving a surface wave is provided with a piezoelectric element 10A, a resin wedge 10C disposed on the front surface of the piezoelectric element 10A and a damping block 10B disposed on the back surface. The surface wave probe 10 is driven to produce a short pulse having a pulse length being at most 2.5 times the wavelength of the surface wave to be produced. A coupling liquid medium is supplied to the probe 10 in accordance with the peripheral speed of the roll to be tested. Depending on the height of the reflected waves measured, the grinding allowance of the roll is determined, and the roll is ground according to the thus-determined grinding allowance.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: September 10, 2002
    Assignee: Kawasaki Steel Corporation
    Inventors: Hajime Takada, Ryouichi Sugimoto, Takashi Morii, Ikuo Yarita
  • Publication number: 20020078751
    Abstract: Methods and apparatus for ultrasonically scanning cylinders are provided. The methods and apparatus employ as few as one ultrasonic sensor for full immersion scanning and defect detection. Self-centering fixturing spins the cylinder, reducing vibration, allowing for fast ultrasonic scans. To create the 45 degree angle beam shear waves for the circumferential scans, the ultrasonic sensor is offset from the centerline of the cylinder, creating the correct angle for excitation of the shear wave.
    Type: Application
    Filed: September 26, 2001
    Publication date: June 27, 2002
    Applicant: Digital Wave Corporation
    Inventors: Steven M. Ziola, Michael R. Gorman
  • Patent number: 6401537
    Abstract: A method for inspecting a titanium-based alloy that comprises alpha phase grains to detect flaws in the titanium-based alloy, the titanium-based alloy comprises an alpha phase that is provided by thermomechanically processing the alloy to provide a microstructure which comprises the alpha phase that defines an average grain size and a crystallographic orientation of the grains of the alpha phase that is highly randomized. The method comprises ultrasonically inspecting the titanium-based alloy using an ultrasonic beam, the ultrasonic beam comprising a cross-sectional area that is less than the average grain size of the alpha phase in the titanium-based alloy; and determining flaws based on the step of ultrasonic inspecting.
    Type: Grant
    Filed: July 2, 1999
    Date of Patent: June 11, 2002
    Assignee: General Electric Company
    Inventors: Michael Francis Xavier Gigliotti, Jr., Robert Snee Gilmore, John Broddus Deaton, Jr., John Alan Sutliff
  • Patent number: 6401044
    Abstract: An installation for the automatic evaluation of the condition of the rolling band on wheels of moving trains. It comprises a rail beam (1) for each railway line (8), a guard-rail to assure wheel guidance, feelers (P1, P2, P3, P4) intended to come into contact with the wheels passing over them, feeler holders fitted on the rail beam, to ensure wheel-feeler contact, ultrasonics equipment (12) to transmit ultrasonic pulses towards the wheels and to generate the corresponding ultrasonic plots, a local processor (13) to control the ultrasonics equipment and to receive the ultrasonic plot signals generated, a computer (14) connected to the local processor to manage the ultrasonics equipment, and an antenna (15) connected to the computer to identify the compositions of train measurements. The invention is useful to detect cracks in the rolling band of railway vehicle wheels.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: June 4, 2002
    Assignees: Patentes Talgo, S.A., Consejo Superior de Investigaciones Cientificas
    Inventors: Alberto Ibanez Rodriguez, Luis Gomez-Ullate Alvear, Jose Javier Anaya Velayos, Eugenio Villanueva Martínez, Monserrat Parrilla Romero, Carlos Fritsch Yusta, Teresa Sánchez Martín, Angel Luis Sanchez Revuelta, Jose Antonio Martos Navarro, Antonio Lupianez Garcia
  • Patent number: 6393916
    Abstract: An ultrasonic inspection method for determining acceptability of material for microstructurally sensitive applications comprises providing a material, directing ultrasonic energy of ultrasonic inspection to the material; scattering reflected energy in the material; determining an amount of noise generated by the ultrasonic inspection; and characterizing the material as acceptable if the amount of noise corresponds to a pre-determined noise level. The invention also sets forth a system for implementing the method, as embodied by the invention.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: May 28, 2002
    Assignee: General Electric Company
    Inventors: Bernard Patrick Bewlay, John Broddus Deaton, Jr., Michael Francis Xavier Gigliotti, Jr., Robert Snee Gilmore
  • Patent number: 6378377
    Abstract: An ultrasonic ice detector that can be mounted directly to the skin of an aircraft includes a transducer that is coupled to the interior surface of the skin, and transmits acoustic vibrational energy through the skin. A reflector bar having a reflector surface is mounted on the interior surface of the skin at a location spaced from the transducer and is effective to reflect acoustic energy back to the transducer. The reflector bar is raised from the interior surface and preferably has a width equal to the width of the acoustic wave that is generated by the transducer at the reflector location. The transducer and reflector are non-intrusive and do not alter the aircraft skin structural integrity. The arrangement provides an accurate, responsive sensor for determining presence of ice or other contaminants on the exterior surface of the skin.
    Type: Grant
    Filed: April 23, 1999
    Date of Patent: April 30, 2002
    Assignee: Rosemount Aerospace Inc.
    Inventors: Timothy J. Matuseski, Derrick D. Hongerholt, Krishna M. Rajana
  • Patent number: RE38148
    Abstract: A detector for detecting detonatable devices such as land mines has a search head with a probe having a tip for placing beneath the surface of the ground. The probe tip ultrasonically provides an indication of the presence of a metal or plastic material. A force sensor coupled to the probe time provides an indication of force at the tip a it is placed beneath the ground surface. Therefore, before too much force is applied to the tip, a user is warned and accidental detonation may be prevented.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: June 24, 2003
    Assignees: Dew Engineering and Development Limited, Her Majesty the Queen in right of Canada, as represented by the Minister of National Defense
    Inventors: Michael A. Borza, Patrick J. Gallagher