Technique for compressing light intensity ranges utilizing a specifically designed liquid crystal notch filter
- Livermore, CA
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4726660
- OSTI ID:
- 866504
- Country of Publication:
- United States
- Language:
- English
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Techniques for optically compressing light intensity ranges
Technique for compressing light intensity ranges utilizing a specifically designed liquid crystal notch filter
Related Subjects
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
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