Interferometric technique for determining ultrasonic wave intens

Details Interferometric technique for determining ultrasonic wave intens Interferometric technique for determining ultrasonic wave intens

1976-04-08

1977-04-26

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

73 675H, 356109, G01N 2146

Patent

active

040198189

ABSTRACT:
An interferometer, that simultaneously employs two phase-quadrature reference beams of coherent light which interfere with a signal beam of coherent light reflected from a spot of a displaceable signal mirror insonified by an ultrasonic wave, permits an output signal to be derived which is proportional to the sum of the squares of the ultrasonic frequency component of the interference between the signal beam and each respective one of the reference beams. This output signal is inherently substantially proportional to the intensity of the ultrasonic wave then insonifying the spot of the signal mirror and independent of random phase drift and environmental vibrations in the interferometer. The interferometric technique of the present invention, which permits the ultrasonic wave to be in the form of pulse bursts of only a few cycles so that the output signal can be range-gated, is suitable for use in an ultrasonic-wave measurement and image display system.

REFERENCES:
patent: 2604004 (1952-07-01), Root
patent: 3716826 (1973-02-01), Green
Peck et al., "Wavelength or Length Measurement by Reversible Fringe Counting," JOSA, vol. 43, No. 6, pp. 505-509, June 1953.
Rowley, "Some Aspects of Fringe Counting in Laser Interferometers," IEEE Trans. on Instru. and Meas., vol. IM-15, No. 4, pp. 146-149, Dec. 1966.

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