Optical displacement sensor

Details Optical displacement sensor Optical displacement sensor

1997-03-20

1998-08-25

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356358, G01C 308, G01B 1102

Patent

active

057988269

ABSTRACT:
A optical displacement sensor comprises optical output detecting unit for detecting an optical output from the semiconductor laser, which changes in accordance with the phase of return light reflected by the external reflection unit, when an optical distance between the semiconductor laser and the external reflection unit changes at a change rate, optical distance modulation unit for changing the optical distance at predetermined periods by an amount of modulation of the optical distance at a rate higher than the change rate, and a detection circuit system for detecting the amount and direction of change of the optical distance based on an optical output from the optical output detecting unit detected in synchronism with a timing of modulating the optical distance by the optical distance modulation unit.

REFERENCES:
patent: 4806778 (1989-02-01), Yamamoto et al.
patent: 5267016 (1993-11-01), Meinzer et al.
K. Choquette et al; "Polarization Modulation of Cruciform Vertical-Cavity Laser Diodes"; May 23, 1994; pp. 2767-2769; Appl. Phys. Lett. 64 (21).
K. Choquette et al; "Transverse-mode Engineering in Vertical Cavity-Surface Emitting Lasers"; pp. 148-149; Cleo '93/ Tuesday Afternoon.

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