High accuracy semiconductor laser doppler velocimeter

Details High accuracy semiconductor laser doppler velocimeter High accuracy semiconductor laser doppler velocimeter

1988-08-15

1990-04-24

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356351, 372 97, G01P 336, H01S 3082

Patent

active

049195328

ABSTRACT:
A Doppler velocimeter having a semiconductor laser which sends a laser beam through a polarization beam splitter onto an fractional-wavelength plate. The plate both reflects the beam back to the polarization beam splitter and sends the beam on through the beam expander to the target. The beam is returned by the target. The returned beam passes through the fractional-wavelength plate to the polarization beam splitter. The returned and reflected beams are directed by the splitter to a detector. The detector mixes the beams and sends a signal to a spectrum analyzer on which the velocity of the target can be accurately determined.

REFERENCES:
patent: 4611912 (1986-09-01), Falk et al.
patent: 4643575 (1987-02-01), Hazeltine
patent: 4738531 (1988-04-01), Lloyd et al.
patent: 4805185 (1989-02-01), Smith
"Small Laser Doppler Velocimeter Based on the Self-Mixing Effect in a Diode Laser", by Jentink et al., Applied Optics vol. 27, No. 2, Jan., 1988.
"Directional Discrimination in the Self-Mixing Type Laser Doppler Velocimeter", by Shimizu, Applied Optics, vol. 26, No. 21, Nov., 1987.
"Interferometric Laser Rangefinder Using a Frequency Modulated Diode Laser", by den Boef, Applied Optics, vol. 26, No. 21, Nov., 1987.
"Laser Doppler Velocimeter Using the Self-Mixing Effect of a Semiconductor Laser Diode", by Shinohara et al., Applied Optics, vol. 25, No. 9, May, 1986.
"Range Finding Using Frequency-Modulated Laser Diode", by Beheim et al., Applied Optics, vol. 25, No. 9, May, 1986.
"Diode-Laser Random-Modulation CW Lidar", by Takeuchi et al., Applied Optics, vol. 25, No. 1, Jan., 1986.

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