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Title: Low noise optical position sensor

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.
Authors:
 [1]
  1. (Berkeley, CA)
Publication Date:
OSTI Identifier:
872182
Report Number(s):
US 5880461
DOE Contract Number:
AC03-76SF00098
Resource Type:
Patent
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
Country of Publication:
United States
Language:
English
Subject:
noise; optical; position; sensor; novel; optical; position; sensor; described; component; photodiodes; electrically; connected; parallel; opposing; polarities; lens; provides; optical; restricts; acceptance; angle; detector; response; device; displacements; optical; spot; similar; conventional; bi-cell; type; position; sensitive; detector; component; photodiode; design; enables; simpler; electronic; amplification; inherently; electrical; noise; bi-cell; measurements; sensor; noise; focused; helium-neon; laser; function; frequency; demonstrate; sensitivity; suitability; optical; probe; beam; deflection; experiments; position sensor; position sensor; probe beam; electrically connected; position sensitive; optical probe; sensitive detector; acceptance angle; electrical noise; provides optical; novel optical; opposing polarities; optical position; optical position; noise optical; cell type; beam deflection /250/396/