Patents by Inventor Christopher M. Fortunko

Christopher M. Fortunko has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5587534
    Abstract: A new ultrasonic method for measuring wall thickness and detecting material flaws in natural-gas pipelines, risers, and similar structures. The method is inherently suitable for the task, because it relies on the use of the natural gas as the coupling fluid for transmitting the probing ultrasonic signals into and out of the pipe wall. Furthermore, the method facilitates the operation of the inspection from the inside of the pipe. An experimental apparatus used to demonstrate the technical feasibility of this approach and provide experimental and theoretical evidence that support the claims is described. Significantly, it is shown that by the use of a diplexer, the same transducer can be used to generate and detect the probing ultrasonic signals. The same configuration is used in commercial ultrasonic inspection of oil pipelines where oil is the coupling fluid; but until now this method could not be used in natural gas pipelines due to the low specific acoustic impedance of natural gas.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: December 24, 1996
    Assignee: The United States of America as represented by the Secretary of Commerce
    Inventors: Joseph D. McColskey, William P. Dube, Christopher M. Fortunko, Raymond E. Schramm, Martin C. Renken, Cecil M. Teller, II, Glenn M. Light
  • Patent number: 5163027
    Abstract: An ultrasonic calibration block for standardizing an output of a pulse-echo ultrasonic inspection system is provided with an insonification surface for receiving ultrasonic pulses from the inspection system and a plurality of reflective interfaces stacked on top of one another and positioned at different distances from the insonification surface, each reflective interface having a different and characteristic reflectivity. A method of calibrating the output of the inspection system, using the calibration block, employs standard waveforms generated by insonifying the calibration block to generate a look-up table of standard waveform amplitudes related to a standardized output of the inspection system for a given material of a part to be inspected.
    Type: Grant
    Filed: March 20, 1992
    Date of Patent: November 10, 1992
    Assignee: Lockheed Corporation
    Inventors: James T. Miller, Bonner W. Staff, Christopher M. Fortunko
  • Patent number: 4290017
    Abstract: An apparatus for characterizing a surface anomaly in an electrically conductive sample includes an oscillator with an amplifier for supplying gain to the oscillator, a feedback loop linking the input and output of the amplifier, a two port ferromagnetic resonator connected within the loop to modulate the level and frequency of oscillation of the oscillator in response to eddy currents induced in the surface of the sample by the resonator, a variable attenuator connected within the loop to adjust the power level of the oscillator, and an adjustable phase shifter connected within the loop for changing the total phase shift of the loop. A sensing circuit is operably connected to the output of the amplifier to monitor the resonance parameters of the oscillator.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: September 15, 1981
    Assignee: Rockwell International Corporation
    Inventor: Christopher M. Fortunko
  • Patent number: 4248092
    Abstract: Disclosed is a method for generating an ultrasonic wave in a material, utilizing a transducer adapted to induce a higher than fundamental mode wave in the material and a signal generator adapted to drive the transducer at a frequency above the cutoff frequency below which the higher mode wave will not propagate. For a horizontal shear wave, optimal transducer efficiency is obtained by selecting a driven frequency between a minimum cutoff frequency f.sub.c =v.sub.s n/2t and an upper frequency sufficiently close to f.sub.c to drive the transducer with at least a preselected increase in efficiency.
    Type: Grant
    Filed: April 25, 1979
    Date of Patent: February 3, 1981
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Carmine F. Vasile, Robert B. Thompson, Christopher M. Fortunko
  • Patent number: 4218924
    Abstract: Disclosed is an electromagnetic acoustic transducer for generating and detecting an elliptically polarized ultrasonic wave in an electrically conductive material. The transducer includes a row of uniformly sized, adjacent, alternately oriented permanent magnets, which establish a periodic magnetic field. Coaxially wound around the row is a first coil for inducing an alternating current perpendicular to the field and perpendicular to the periodic direction, while a second coil is wound around the coil orthogonal to the first coil to induce an alternating current perpendicular to the field and parallel to the periodic direction. An ultrasonic ellipsometer includes such a dual coil transmitting transducer for generating an elliptically polarized wave and a dual coil receiving transducer for detecting the wave after it has propagated through an electrically conductive medium.
    Type: Grant
    Filed: July 2, 1979
    Date of Patent: August 26, 1980
    Assignee: Rockwell International Corporation
    Inventors: Christopher M. Fortunko, Carmine F. Vasile, Robert B. Thompson
  • Patent number: 4184374
    Abstract: A method and an apparatus are provided for ultrasonically inspecting a cylindrical object. The object is placed between the poles of a magnet to create a circumferential magnetic field in the object. A group of electromagnetic transducers (EMAT's) are placed adjacent the material so that the transducers scan the entire object when it is rotated. When an RF signal is applied to the transducers, elastic waves are generated in the material. These elastic waves reflect from defects in the material and these reflections are received by the transducers.
    Type: Grant
    Filed: June 22, 1978
    Date of Patent: January 22, 1980
    Assignee: Rockwell International Corporation
    Inventors: Robert B. Thompson, Christopher M. Fortunko
  • Patent number: 4167120
    Abstract: A surface acoustic wave bridge for rotation measurement which uses acoustic waves propagated in opposite directions about the circumference of a rotor. The acoustic waves are generated by a transducer adjacent the rotor which is excited by an rf electric field. Clockwise and counterclockwise waves in the surface of the rotor interfere with each other adjacent the transducer to form a bridge system which produces a null when the waves are out of phase. The rf frequency of the electric field is varied to obtain the null and, thus, is a measurement of the rotation rate of the rotor.For the measurement of slow rotation rates two transducers are used to generate the counterrotating acoustic waves in a helical pattern such that the acoustic wave generated by one transducer is received by the other. The outputs of the transducers are detected and provide an approximately linear measurement of slow rotational rates.
    Type: Grant
    Filed: May 18, 1978
    Date of Patent: September 11, 1979
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Herbert J. Shaw, Jacques Souquet, Christopher M. Fortunko