Measuring and testing – Vibration – By mechanical waves
Patent
1990-10-15
1992-06-30
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73602, G01N 2918
Patent
active
051252732
ABSTRACT:
A method for measuring a propagation speed of ultrasonic wave transmission through a medium of known dimension, comprises a step of generating a plurality of pulse trains at each cycle of a predetermined time interval t.sub.i, each of the RF pulse trains being composed of at least two consecutive RF pulses generated at a predetermined time period t.sub.s for exciting an output ultrasonic wave. The measuring method also includes the step of inputting a signal indicative of a superposed ultrasonic echo occurring due to the output ultrasonic wave applied to the medium, on a Y-axis of an oscilloscope, and inputting continuous X-axis trigger pulses having a predetermined period t.sub.o on an X-axis of the oscilloscope. The speed of the ultrasonic wave is derived on the basis of a length of the medium and the period t.sub.s read through the oscilloscope when an amplitude of the echo signal becomes greatest and the echo signals are overlapped in phase, by adjusting a value of the period t.sub.o while keeping the period relationship of t.sub.o =t.sub.s =t.sub.i /m, wherein m is an integer which exceeds the number of the RF pulses of the RF pulse train.
REFERENCES:
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Papadakis, "Ultrasonic Phase Velocity by the Pulse-Echo-Overlap Method Incorporating Diffraction Phase Corrections", The Journal of the Acoustical Society of America, 40, 863-876 (1966).
McSkimin, "Pulse Superposition Method of Measuring Ultrasonic Wave Velocities in Solids", The Journal of the Acoustical Society of America, vol. 33, No. 1, Jan. 1966, pp. 12-16.
Finley Rose M.
Nissan Motor Company Limited
Williams Hezron E.
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