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Title: Faraday imaging at high temperatures

A Faraday filter rejects background light from self-luminous thermal objects, but transmits laser light at the passband wavelength, thus providing an ultra-narrow optical bandpass filter. The filter preserves images so a camera looking through a Faraday filter at a hot target illuminated by a laser will not see the thermal radiation but will see the laser radiation. Faraday filters are useful for monitoring or inspecting the uranium separator chamber in an atomic vapor laser isotope separation process. Other uses include viewing welds, furnaces, plasma jets, combustion chambers, and other high temperature objects. These filters are can be produced at many discrete wavelengths. A Faraday filter consists of a pair of crossed polarizers on either side of a heated vapor cell mounted inside a solenoid.
Inventors:
 [1];  [2]
  1. (Livermore, CA)
  2. (Hayward, CA)
Issue Date:
OSTI Identifier:
870872
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5612538
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
faraday; imaging; temperatures; filter; rejects; background; light; self-luminous; thermal; transmits; laser; passband; wavelength; providing; ultra-narrow; optical; bandpass; preserves; images; camera; looking; hot; target; illuminated; radiation; filters; useful; monitoring; inspecting; uranium; separator; chamber; atomic; vapor; isotope; separation; process; viewing; welds; furnaces; plasma; jets; combustion; chambers; temperature; produced; discrete; wavelengths; consists; pair; crossed; polarizers; heated; cell; mounted; inside; solenoid; mounted inside; background light; faraday filter; atomic vapor; bandpass filter; thermal radiation; vapor laser; separation process; combustion chamber; laser light; isotope separation; laser radiation; laser isotope; pass filter; plasma jet; optical bandpass; combustion chambers; cell mounted; optical band; /250/