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Title: Low noise optical position sensor

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.

Inventors:
 [1]
  1. Berkeley, CA
Issue Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
872182
Patent Number(s):
5880461
Assignee:
Regents of University of California (Oakland, CA)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01J - MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT
G - PHYSICS G02 - OPTICS G02B - OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
noise; optical; position; sensor; novel; described; component; photodiodes; electrically; connected; parallel; opposing; polarities; lens; provides; restricts; acceptance; angle; detector; response; device; displacements; spot; similar; conventional; bi-cell; type; sensitive; photodiode; design; enables; simpler; electronic; amplification; inherently; electrical; measurements; focused; helium-neon; laser; function; frequency; demonstrate; sensitivity; suitability; probe; beam; deflection; experiments; position sensor; probe beam; electrically connected; position sensitive; optical probe; sensitive detector; acceptance angle; electrical noise; provides optical; novel optical; opposing polarities; optical position; noise optical; cell type; beam deflection; /250/396/

Citation Formats

Spear, Jonathan David. Low noise optical position sensor. United States: N. p., 1999. Web.
Spear, Jonathan David. Low noise optical position sensor. United States.
Spear, Jonathan David. Fri . "Low noise optical position sensor". United States. https://www.osti.gov/servlets/purl/872182.
@article{osti_872182,
title = {Low noise optical position sensor},
author = {Spear, Jonathan David},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

Patent:

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