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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. 14 figs.
Authors:
Publication Date:
OSTI Identifier:
335502
Report Number(s):
US 5,880,461/A/
PAN: US patent application 8-755,076
DOE Contract Number:
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 9 Mar 1999
Research Org:
University of California
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; OPTICAL SYSTEMS; DISPLACEMENT GAGES; DESIGN; PHOTODIODES; USES; HELIUM-NEON LASERS; SENSITIVITY