Non-linear optical crystal vibration sensing device

Details Non-linear optical crystal vibration sensing device Non-linear optical crystal vibration sensing device

1992-06-19

1994-08-09

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

73657, 356354, 356349, 359240, G01H 100, G01H 900

Patent

active

053355482

ABSTRACT:
A non-linear optical crystal vibration sensing device (10) including a photorefractive crystal (26) and a laser (12). The laser (12 ) produces a coherent light beam (14) which is split by a beam splitter (18) into a first laser beam (20) and a second laser beam (22). After passing through the crystal (26) the first laser beam (20) is counter-propagated back upon itself by a retro-mirror (32), creating a third laser beam (30). The laser beams (20, 22, 30) are modulated, due to the mixing effect within the crystal (26) by vibration of the crystal (30). In the third laser beam (30), modulation is stable and such modulation is converted by a photodetector (34) into a usable electrical output, intensity modulated in accordance with vibration applied to the crystal (26).

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Kalibjian, Ralph, "Vibration Sensing In A Four-Wave Mixing Geometry At 63M In BATI03", Sep. 19, 1991, UCRL-JC108742.
Sasaki, O. "Laser Doppler Vibration Measuring System Using Bispectral Analysis", Applied Optics, vol. 19, No. 1 (Jan. 01, 1980), pp. 151-153.

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