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Title: Apparatus and method for heterodyne-generated two-dimensional detector array using a single element detector

Abstract

Apparatus and method are disclosed for heterodyne-generated, two-dimensional detector array using a single detector. Synthetic-array heterodyne detection, permits a single-element optical detector to behave as though it were divided into an array of separate heterodyne detector elements. A fifteen-element synthetic array has successfully been experimentally realized on a single-element detector, permitting all of the array elements to be read out continuously and in parallel from one electrical connection. A CO{sub 2} laser and a single-element HgCdTe photodiode are employed. A different heterodyne local oscillator frequency is incident upon the spatially resolvable regions of the detector surface. Thus, different regions are mapped to different heterodyne beat frequencies. One can determine where the photons were incident on the detector surface even though a single electrical connection to the detector is used. This also prevents the destructive interference that occurs when multiple speckles are imaged (similar to spatial diversity), In coherent LIDAR this permits a larger field of view. An acoustooptic modulator generates the local oscillator frequencies and can achieve adequate spatial separation of optical frequencies of the order of a megahertz apart. 4 figs.

Inventors:
Issue Date:
Research Org.:
University of California
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
563711
Patent Number(s):
5,689,335
Application Number:
PAN: 8-540,434
Assignee:
Univ. of California, Los Alamos, NM (United States) PTO; SCA: 440600; 440800; PA: EDB-98:015880; SN: 98001896346
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 18 Nov 1997
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; OPTICAL SYSTEMS; OPTICAL RADAR; MEASURING INSTRUMENTS; DESIGN; READOUT SYSTEMS; CARBON DIOXIDE LASERS; PHOTODIODES

Citation Formats

Strauss, C.E. Apparatus and method for heterodyne-generated two-dimensional detector array using a single element detector. United States: N. p., 1997. Web.
Strauss, C.E. Apparatus and method for heterodyne-generated two-dimensional detector array using a single element detector. United States.
Strauss, C.E. Tue . "Apparatus and method for heterodyne-generated two-dimensional detector array using a single element detector". United States.
@article{osti_563711,
title = {Apparatus and method for heterodyne-generated two-dimensional detector array using a single element detector},
author = {Strauss, C.E.},
abstractNote = {Apparatus and method are disclosed for heterodyne-generated, two-dimensional detector array using a single detector. Synthetic-array heterodyne detection, permits a single-element optical detector to behave as though it were divided into an array of separate heterodyne detector elements. A fifteen-element synthetic array has successfully been experimentally realized on a single-element detector, permitting all of the array elements to be read out continuously and in parallel from one electrical connection. A CO{sub 2} laser and a single-element HgCdTe photodiode are employed. A different heterodyne local oscillator frequency is incident upon the spatially resolvable regions of the detector surface. Thus, different regions are mapped to different heterodyne beat frequencies. One can determine where the photons were incident on the detector surface even though a single electrical connection to the detector is used. This also prevents the destructive interference that occurs when multiple speckles are imaged (similar to spatial diversity), In coherent LIDAR this permits a larger field of view. An acoustooptic modulator generates the local oscillator frequencies and can achieve adequate spatial separation of optical frequencies of the order of a megahertz apart. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {11}
}