Laser heterodyne interferometric method and system for...

Details Laser heterodyne interferometric method and system for... Laser heterodyne interferometric method and system for...

G - Physics

01

B

73/53

G01B 9/02 (2006.01) G01H 9/00 (2006.01) G01N 29/24 (2006.01)

Patent

CA 1230753

LASER HETERODYNE INTERFEROMETRIC METHOD AND SYSTEM FOR MEASURING ULTRASONIC DISPLACEMENTS Abstract of the Disclosure The invention is concerned with a laser hetero- dyne interferometric method and system for measuring the displacement of a free surface of a material subjected to ultrasound. A laser beam having a predetermined in- tensity is generated and then divided into first and second beam portions having respective intensities re- presenting minor and major fractions of the predetermined intensity, the first beam portion being angularly dis- placed relative to the second beam portion and being frequency shifted by a predetermined frequency. The second beam portion is passed through an optical lens off-center thereof to focalize the second beam portion onto the free surface of the material subjected to ultra- sound, thereby scattering same. The scattered second beam portion is combined with the first beam portion to obtain an optical fringe signal which is converted into an electrical fringe signal comprising a central peak at the predetermined frequency and a sideband on either side of the central peak. The electrical fringe signal is thereafter processed through circuitry means without de- modulating a phase modulation produced by ambient vibra- tions, to extract a signal proportional to the displace- ment of the free surface. - 1 -

483058

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