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
- 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
Similar Records
Techniques for optically compressing light intensity ranges
Technique for compressing light intensity ranges utilizing a specifically designed liquid crystal notch filter
Related Subjects
accomplish
appearing
arrangement
assembly
assembly utilizes
atomic
atomic vapor
avlis
band
camera
camera assembly
causing
cholesteric
cholesteric liquid
combination
compressing
compressing light
configured
containing
containing molten
crucible
crucible containing
crystal
crystal notch
decipherable
defines
designed
disclosed
example
extent
filter
incidence
input
intensity
intensity range
intensity ranges
interference
interference filter
isotope
isotope separation
laser
laser isotope
latter
light
light incidence
light intensity
limited
limited extent
liquid
liquid crystal
means
metal
molten
molten metal
narrow
narrow wavelength
notch
notch filter
optically
optically compressing
pass
pass light
preferably
range
ranges
receivable
relatively
relatively narrow
separation
specifically
specifically designed
standard
standard video
sufficient
surface
technique
utilizes
utilizing
vapor
vapor laser
vary
video
video camera
viewing
wavelength
wavelength band
wavelengths