Method for measuring the propagation velocity of ultrasonic acou

Details Method for measuring the propagation velocity of ultrasonic acou Method for measuring the propagation velocity of ultrasonic acou

1995-12-01

1997-11-25

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

7315243, 7315203, 367 27, 181102, G01N 2918

Patent

active

056914750

ABSTRACT:
Method for measuring the propagation velocities of ultrasonic acoustic waves through rock fragments which includes the steps of (a) introducing the fragment in a coupling fluid between a pair of piezoelectric transducers capable of generating highly damped ultrasonic acoustic waves; (b) passing highly damped ultrasonic acoustic waves through the fragment, said waves being generated by a pulse generator with a pulse width varying from 0.1 .mu.s to 20 .mu.s; (c) visualizing the obtained electric signals by an oscilloscope with a resolution of at least 10.sup.-2 .mu.s; and (d) measuring the transit time of the waves themselves. The ultrasonic acoustic waves may be compressional or shear waves. In one embodiment the coupling fluid has a viscosity varying be 200 and 800 poises.

REFERENCES:
patent: 3995501 (1976-12-01), Wiley
patent: 4002221 (1977-01-01), Buchalter
patent: 4365516 (1982-12-01), Molina
patent: 4933911 (1990-06-01), Sondergeld et al.

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