Laser optical ultarasound detection using two interferometer sys

Details Laser optical ultarasound detection using two interferometer sys Laser optical ultarasound detection using two interferometer sys

1990-10-31

1992-01-14

Turner, Samuel

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356358, 73657, G01B 902

Patent

active

050804910

ABSTRACT:
A laser ultrasound detection technique which is insensitive to laser intensity fluctuations, perturbation at the object surface and the like is disclosed. The invention consists of two substantially identical interferometers of the Fabry-Perot type or such an interferometer with a birefringent element in its optical cavity. The interferometers have resonance frequencies higher and lower than the laser frequency so that noises can be cancelled out by signal processing.

REFERENCES:
patent: 4345475 (1982-08-01), Bickel
patent: 4360272 (1982-11-01), Schmadel et al.
patent: 4379633 (1983-04-01), Bickel et al.
patent: 4659224 (1987-04-01), Monchalin
patent: 4966459 (1990-10-01), Monchalin
Monchalin, J. P., IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. UFFC-33, No. 5, Sep. 1986, pp. 485-489.
Stokes, L. F. et al., Optics Letters, vol. 7, No. 6, Jun. 1982, pp. 288-290.

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