Faraday imaging at high temperatures

Patent · Wed Jan 01 00:00:00 EST 1997

OSTI ID:870872

Hackel, Lloyd A ^[1]; Reichert, Patrick ^[2]

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1. Livermore, CA
2. Hayward, CA

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.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: Regents of University of California (Oakland, CA)
• Patent Number(s): US 5612538
• OSTI ID: 870872
• Country of Publication: United States
• Language: English

Related Subjects

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/