Laser interferometer for measuring distance using a frequency di

Details Laser interferometer for measuring distance using a frequency di Laser interferometer for measuring distance using a frequency di

1990-11-16

1993-12-28

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356358, G01B 902

Patent

active

052744361

ABSTRACT:
A laser interferometer uses an acousto-optically modulated laser (100) to produce a pair of orthogonally polarized frequency-shifted beams. The beams are passed down a monomode, polarization preserving optical fiber (110) in order to transmit the beams to a cavity (148). The beams are separated at polarizing beam splitter (128) and directed down measuring arm (130) and reference arm (132) of an interferometer. The beat frequency between the reflected beams is detected at photo-detector (146) which outputs a measuring signal (152). This beat frequency is compared to the beat frequency of the beams before entering the interferometer, which is derived by providing a semisilvered mirror (114) and interfering polaroid (116) in the path of the beams up-beam of the interferometer to produce a reference signal (126). The measuring and reference signals are compared to determine the movement of the measuring arm of the interferometer. This method of determining the reference signal makes the apparatus less susceptible to temperature changes.

REFERENCES:
patent: 3534292 (1970-10-01), Cutler
patent: 3881823 (1975-05-01), De Lang et al.
patent: 4278352 (1981-07-01), Keller
patent: 4627731 (1986-12-01), Waters et al.
patent: 4688940 (1987-08-01), Sommargren et al.
patent: 4762414 (1988-08-01), Grego
patent: 4767210 (1988-08-01), Kashyap
Absolute Optical Ranging With 200-NM Resolution by Williams et al. Optics Letter 14 (1989) 1 Jun., No. 11, N.Y.

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