Light intensity compressor
- Livermore, CA
In a system for recording images having vastly differing light intensities over the face of the image, a light intensity compressor is provided that utilizes the properties of twisted nematic liquid crystals to compress the image intensity. A photoconductor or photodiode material that is responsive to the wavelength of radiation being recorded is placed adjacent a layer of twisted nematic liquid crystal material. An electric potential applied to a pair of electrodes that are disposed outside of the liquid crystal/photoconductor arrangement to provide an electric field in the vicinity of the liquid crystal material. The electrodes are substantially transparent to the form of radiation being recorded. A pair of crossed polarizers are provided on opposite sides of the liquid crystal. The front polarizer linearly polarizes the light, while the back polarizer cooperates with the front polarizer and the liquid crystal material to compress the intensity of a viewed scene. Light incident upon the intensity compressor activates the photoconductor in proportion to the intensity of the light, thereby varying the field applied to the liquid crystal. The increased field causes the liquid crystal to have less of a twisting effect on the incident linearly polarized light, which will cause an increased percentage of the light to be absorbed by the back polarizer. The intensity of an image may be compressed by forming an image on the light intensity compressor.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- H000737
- Application Number:
- 07/241231
- OSTI ID:
- 875246
- Resource Relation:
- Patent File Date: 1988 Aug 18
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
light
intensity
compressor
recording
images
vastly
differing
intensities
image
provided
utilizes
properties
twisted
nematic
liquid
crystals
compress
photoconductor
photodiode
material
responsive
wavelength
radiation
recorded
placed
adjacent
layer
crystal
electric
potential
applied
pair
electrodes
disposed
outside
arrangement
provide
field
vicinity
substantially
transparent
form
crossed
polarizers
opposite
front
polarizer
linearly
polarizes
cooperates
viewed
scene
incident
activates
proportion
varying
increased
causes
twisting
effect
polarized
percentage
absorbed
compressed
forming
substantially transparent
potential applied
liquid crystals
placed adjacent
light intensities
light incident
crystal material
polarized light
electric field
light intensity
electric potential
liquid crystal
linearly polarized
field applied
recording images
disposed outside
intensity compressor
field causes
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