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Title: Technique for compressing light intensity ranges utilizing a specifically designed liquid crystal notch filter

Abstract

A pin hole camera assembly for use in viewing an object having a relatively large light intensity range, for example a crucible containing molten metal in an atomic vapor laser isotope separation (AVLIS) system is disclosed herein. The assembly includes means for optically compressing the light intensity range appearing at its input sufficient to make it receivable and decipherable by a standard video camera. To accomplish this, the assembly utilizes the combination of interference filter and a liquid crystal notch filter. The latter which preferably includes a cholesteric liquid crystal arrangement is configured to pass light at all wavelengths, except a relatively narrow wavelength band which defines the filter's notch, and includes means for causing the notch to vary to at least a limited extent with the intensity of light at its light incidence surface.

Inventors:
 [1]
  1. Livermore, CA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
866504
Patent Number(s):
US 4726660
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
technique; compressing; light; intensity; ranges; utilizing; specifically; designed; liquid; crystal; notch; filter; camera; assembly; viewing; relatively; range; example; crucible; containing; molten; metal; atomic; vapor; laser; isotope; separation; avlis; disclosed; means; optically; appearing; input; sufficient; receivable; decipherable; standard; video; accomplish; utilizes; combination; interference; latter; preferably; cholesteric; arrangement; configured; pass; wavelengths; narrow; wavelength; band; defines; causing; vary; limited; extent; incidence; surface; containing molten; atomic vapor; interference filter; relatively narrow; video camera; vapor laser; molten metal; isotope separation; laser isotope; light intensity; liquid crystal; specifically designed; wavelength band; narrow wavelength; standard video; assembly utilizes; optically compressing; notch filter; pass light; intensity range; camera assembly; cholesteric liquid; limited extent; compressing light; light incidence; crystal notch; intensity ranges; crucible containing; /349/

Citation Formats

Rushford, Michael C. Technique for compressing light intensity ranges utilizing a specifically designed liquid crystal notch filter. United States: N. p., 1988. Web.
Rushford, Michael C. Technique for compressing light intensity ranges utilizing a specifically designed liquid crystal notch filter. United States.
Rushford, Michael C. Fri . "Technique for compressing light intensity ranges utilizing a specifically designed liquid crystal notch filter". United States. https://www.osti.gov/servlets/purl/866504.
@article{osti_866504,
title = {Technique for compressing light intensity ranges utilizing a specifically designed liquid crystal notch filter},
author = {Rushford, Michael C},
abstractNote = {A pin hole camera assembly for use in viewing an object having a relatively large light intensity range, for example a crucible containing molten metal in an atomic vapor laser isotope separation (AVLIS) system is disclosed herein. The assembly includes means for optically compressing the light intensity range appearing at its input sufficient to make it receivable and decipherable by a standard video camera. To accomplish this, the assembly utilizes the combination of interference filter and a liquid crystal notch filter. The latter which preferably includes a cholesteric liquid crystal arrangement is configured to pass light at all wavelengths, except a relatively narrow wavelength band which defines the filter's notch, and includes means for causing the notch to vary to at least a limited extent with the intensity of light at its light incidence surface.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

Patent:

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