Laser induced acoustic generation for sonic modulus

Details Laser induced acoustic generation for sonic modulus Laser induced acoustic generation for sonic modulus

1985-08-23

1986-11-18

Levy, Stewart J.

Measuring and testing

Vibration

By mechanical waves

73159, 73643, G01N 2900, D21F 700

Patent

active

046228535

ABSTRACT:
A method and device which measures the velocity of ultrasonic waves in a moving web is disclosed. The excitation source is a laser or other device which produces short intense light pulses and the detection system is either a piezoelectric transducer or a microphone. The latter obviates any need for physical contact with the web in order to carry out tests for strength parameters as the web is manufactured.

REFERENCES:
patent: 4255971 (1981-03-01), Rosencwaig
patent: 4276780 (1981-07-01), Patel et al.
patent: 4291577 (1981-09-01), Baum et al.
patent: 4574634 (1986-03-01), Pappano
Scruby et al., "A Laser-Generated Standard Acoustic Emission Source", Materials Evaluation 39, Dec. 1981, pp. 1250-1254.

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