Fiber optic displacement sensor with oscillating optical path le

Details Fiber optic displacement sensor with oscillating optical path le Fiber optic displacement sensor with oscillating optical path le

1986-10-01

1988-01-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250227, G01J 120

Patent

active

047193417

ABSTRACT:
A proximity sensor includes a bifurcated optic fiber bundle with a face and a projection lens for projecting an image on a target and a feedback control loop for maintaining said face at a preselected distance from the target for tracking. An oscillating device is provided which is disposed in the light path with fixed excursion between the face and the target and which generates an AC component in said sensor signal that is proportional to the deviation of the actual distance from the preselected distance, whereby the error signal is kept near zero.

REFERENCES:
patent: 4070116 (1978-01-01), Frosch et al.
patent: 4118736 (1978-10-01), Okada et al.
patent: 4310911 (1982-01-01), Fujishima
patent: 4342919 (1982-08-01), Brogardh
patent: 4439848 (1984-03-01), Cheshkovsky et al.

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