Low noise optical position sensor

Details Low noise optical position sensor Low noise optical position sensor

1996-11-22

1999-03-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

396112, G01J 142

Patent

active

058804617

ABSTRACT:
A novel optical position sensor is described that uses two component photodiodes electrically connected in parallel, with opposing polarities. A lens provides optical gain and restricts the acceptance angle of the detector. The response of the device to displacements of an optical spot is similar to that of a conventional bi-cell type position sensitive detector. However, the component photodiode design enables simpler electronic amplification with inherently less electrical noise than the bi-cell. Measurements by the sensor of the pointing noise of a focused helium-neon laser as a function of frequency demonstrate high sensitivity and suitability for optical probe beam deflection experiments.

REFERENCES:
patent: 4039824 (1977-08-01), Nanba
patent: 4209241 (1980-06-01), Nanba et al.
patent: 4408853 (1983-10-01), Tokutomi et al.

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