Abstract: A transducer drive assembly is disclosed having particular application for use in medical diagnostic imaging systems. The drive assembly includes a rotor coupled to drive means for rotation about its longitudinal axis. The rotor is formed such that it includes an integrally formed contact plate which extends upwardly from a generally flat rotor face at a given angle. A transducer is carried in a cradle which is mounted for pivotal movement, and includes a lower base portion having a generally cylindrical cross section. The lower base portion of the cradle is disposed such that it is maintained in physical contact with the rotor contact plate at all times. The rotation of the rotor applies force to the lower base of the cradle resulting in the oscillation of the cradle about the pivot points. The transducer is thereby oscillated back and forth about the pivot points in a uniform and continuous movement so long as the rotor continues to rotate.

Abstract: A method and an apparatus of ultrasonic flaw detection suitable for detecting internal cavern defects of a material, the method involving the mounting on a rotary body of a plural number of skew probes in equidistant positions in the circumferential direction of the rotary body to provide a corresponding number of channels for transmitting and receiving ultrasonic beams in a direction intersecting the axis of rotation of the rotary body at different depths in an inspection zone of a material positioned opposingly to the probes. The rotary body is turned to revolve the probes through 360.degree. about the axis of rotation while transmitting and receiving the ultrasonic pulses. Selected flaw patterns are produced from the peak values of the echoes received at the detection gates of the respective channels in relation with the direction of incidence of the ultrasonic beams.

Abstract: A flexible tying member for a theftproof device which is adapted to give warning in response to a change in a photo signal transmitted in an optical fiber extending through the flexible tying member. The flexible tying member has a coaxial structure comprising a central layer including one of the optical fiber and at least one electric wire, an intermediate layer including the other of these two members, and an outer wall layer including a reinforcing member.

Abstract: The system according to the invention comprises a sensor composed of a movable unit formed by an electrical circuit in which are placed two supple blade switches closed by a rocking member in response to the presence of a yarn. Said circuit comprises a conductor wound on a magnetic core. The data transmitting device comprises a fixed looped conductor of which one part is parallel to the path followed by the sensor and traverses the core. Means are provided for generating oscillations in the looped conductor, as well as means for detecting a variation in the oscillating conditions induced by a change of state of the electrical circuit due to the closure of one switch and indicating that the sensor has met up with a yarn. Due to the detection of the variations in the oscillating conditions, it is possible to find out the number of breakages occurring in the textile machine.

Abstract: A resonant sensing device for measuring the hardness of a workpiece to be tested includes a diamond tipped rod adapted to be resonant and for determining the hardness of a workpiece to be tested is brought into forced contact with such workpiece. The difference in resonant frequency of the rod between its not-constrained condition and its constrained condition (forced contact) is a measure of the hardness of the workpiece. The present invention describes a circuit wherein during a first time interval an up/down counter accumulates the counts arising from the oscillations of the not-constrained rod. During the ensuing interval of the same duration, the counter counts down the accumulated count responsive to the oscillations of the constrained rod.

Abstract: In a method for performing a step rate test on an injection well, a portable pumping unit is employed to increase the pressure on the injected water to a predetermined level in order to carry out the step rate test, and the predetermined pressure and flow rate are maintained and controlled by separating a portion of the pressurized water outflow from the portable pump from the main stream thereof, and the separated portion of pressurized water is returned to the water storage tank which feeds the input to the portable pump.

Abstract: A method of detecting inadequately supported sections or overloaded points in a pipeline including the steps of traversing the interior of the pipeline with an instrumentation pig, sequentially striking or vibrating the wall of the pipeline by means carried by the pig to introduce vibratory signals into the pipeline, receiving said signals from within the pipeline by listening to the sounds generated as a consequence of the striking of the interior wall, and detecting preselected characteristics of received sound which are indicative of unsupported sections or of points of load and stress concentration in the pipeline.

Abstract: An ultrasonic method and apparatus are described for determining the depth of cracks 12 in a pipe or conduit 14. The apparatus 10 includes a transmitting transducer 30 and a receiving transducer 40 that are placed on the outside surface of the pipe to one side of the pipe. The transmit transducer 30 is energized to direct a shear wave beam 34 of ultrasonic energy at the crack to generate a complex reflected wave front from the crack 12 which contains information as to the size of the crack in relation to the wall thickness. The recovery transducer 40 is moved relative to the transmit transducer until a peak or maximum amplitude reading is found. When the maximum amplitude is found, the distance between the transducers is measured. The measured distance is then correlated with information obtained from specimens 80 of the same material and wall thickness as the on-site pipe to determine the depth of the crack 12.

Abstract: A method and apparatus for determining stress in a material independent of micro-structural variations and anisotropies. The method comprises comparing the velocities of two horizontally polarized and horizontally propagating ultrasonic shear waves with interchanged directions of propagation and polarization. The apparatus for carrying out the method comprises periodic permanent magnet-electromagnetic acoustic transducers for generating and detecting the shear waves and means for determining the wave velocities.

Abstract: Real time image zoom is obtained by sampling electrical signals corresponding to reflected ultrasonic waves at a sampling frequency whereby display data is obtained only in an area of interest. The sampling is delayed to eliminate signals from areas not of interest. Ultrasonic pulse repetition rate is selected so that internal resolution in the area of interest is optimized.

Abstract: A method and apparatus for the non-destructive testing of materials, particularly composite structures and other such laminated materials, which comprises repeatedly impacting the material being tested with a precisely regulated force having a pre-determined magnitude. The response generated by the material is detected by a sensor and a proportional electrical signal is generated. The electrical signal is compared with a stored electrical signal previously generated in response to impacting a defect-free reference material with the same precisely regulated pre-determined force. A difference in frequency and amplitude between the two compared electrical signals is indicative of a defect in the material being tested.

Abstract: A roller-type ultrasonic probe comprises a support having two parallel limbs, and two coaxially aligned hubs each extending from a respective limb towards the other. An ultrasonic transmitter is mounted in one hub, a receiver is mounted in the other, and an acoustic screen is disposed between the adjacent ends of the hubs. Respective glycerine-filled rollers are mounted on each hub, and a common (or split) tire fits over both rollers. The respective axes of the transmitter and the receiver are preferably inclined at about 5.degree. and 7.degree. respectively towards the radially extending plane between the transmitter and receiver. The arrangement is particularly compact, and facilitates high-resolution ultrasonic investigation of bond quality in glass or carbon-fibre reinforced plastic sheets and other laminates.

Abstract: Ultrasonic diagnosis apparatus including a plurality of transducer elements in a probe actuated by electric pulses for emitting ultrasonic pulses, for receiving echo ultrasonic pulses, and for issuing electric pulses corresponding to the echo pulses; a pulse generator; apparatus for processing the electric pulse information issued by the probe; a photo transmission line interconnecting the pulse generator and the probe and interconnecting the probe and the processing apparatus; and devices for converting electric pulses to photo pulses for conveyance on the photo transmission line and devices for reconverting the photo pulses to electric pulses after conveyance on the photo transmission lines are utilized with M number of multiplexers. Each multiplexer has L number of taps to drive N number of transducer elements where N=M.times.L.

Abstract: Apparatus for detecting the viscosity of blood comprises a hypodermic syringe including a transparent hollow tube, a needle secured to one end of the tube and a plunger in the tube for creating a vacuum for extracting a predetermined volume of blood and depositing the blood in the transparent hollow tube for immediately performing internal viscosity measurement without substantial change in temperature and without any chemical change (e.g. exidation) in the blood sample. An apertured weight member within the transparent hollow tube is movable by gravity at a rate which is a function of the viscosity of the blood and indicia means, visible on the side of the transparent tube indicates the rate of movement of the apertured weight member through the predetermined volume of blood as a measure of the viscosity of the blood in the tube.

Abstract: An enclosure to define a substantially annular chamber around a conduit to be tested for leakage, and to confine a liquid to permit the visual detection of gas bubbles indicative of a gas leak in the conduit. The enclosure is sleeve-like and includes two body members pivotable about a longitudinal hinge to permit quick attachment to and removal from a pipe section. A longitudinal seal is provided and a radial seal extends from corresponding ends of the body members to define the bottom wall of the enclosure and to sealingly engage the pipe.

Abstract: A method for detecting a polymerization rate, wherein a polymer composition in a polymerization reaction process is sampled out and can be measured, and is separated into a volatile component and a non-volatile component, and the polymerization rate of the polymer composition is determined using the measured amount of the volatile component and/or non-volatile component, and also possibly the measured amount of the sample. Such method is best suited for detecting the rate of polymerization of polymer compositions. This enables proper quality control of the polymer composition in the polymerization reaction process.

Abstract: The scanhead uses a shaft mounted, oscillating rotor driven by a shaft mounted rotor. Energy storage and repulsive means, provided by magnetic "bumpers" helps to reverse the direction of motion of the rotor at the end of the scan angle.

Abstract: A device for determining the stuck point of a drill pipe in a borehole consisting of two relatively movable sections, anchoring means for each section, a sensing means for detecting relative movement of the two sections and producing an inductance representative of the movement. The inductance is transformed into a frequency modulated signal which is transmitted to the surface and converted from a non-linear direct current voltage representation of relative movement to a linear direct current voltage.

Abstract: A method of forming a desired vibration spectrum comprising the steps of preliminarily causing vibration of an article in a predetermined frequency range by the use of harmonic variable-frequency oscillations and using a multichannel signal shaper to produce specific values of spectral vibration acceleration density at each chosen check point on the article under test in each band of the predetermined frequency range, a random output signal level K in each channel being computed by solving a set of linear equations. A device for accomplishing the proposed method comprises the multichannel shaper connected to a vibrator mounting the article under test; vibration pick-ups secured at the chosen check points and connected through a switch to the input of a signal analyzer; a unit for setting parameters of a desired random vibration spectrum; and a control unit. The device forming the subject of the invention also comprises a variable-frequency harmonic oscillator and a memory unit connected thereto.

Abstract: A system for testing articles with random and harmonic vibrations comprises a multichannel random signal shaper, a tuneable rejection filter connected to the output of the shaper, a vibrator connected to the output of the filter through an adder and a power amplifier which are placed in series, first and second tuneable filters and a signal spectrum analyzer connected to the first tuneable filter. The system according to the invention includes a variable-frequency harmonic signal generator, the signal spectrum analyzer representing a harmonic signal analyzer and comprising a harmonic signal control loop and a random signal control loop coupled thereto.