Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1997-09-16
1999-03-16
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
G01B 902
Patent
active
058837132
ABSTRACT:
A Fourier transform interferometer for rapid scanning of scenes such as explosions wherein an incoming beam of light to be analyzed is split by a beam splitter into a first portion and a second portion. The first portion of the incoming light is sent down one arm of the interferometer where it passes through a rotating scanning cube for changing the path length in that arm of the interferometer. The light is then reflected by a retro mirror and sent back through the scanning cube to the beam splitter for sending a portion of the returning beam to a detector. The second portion of the incoming light is sent down a second arm of the interferometer where it passes through a compensator. The light is then reflected by a retro mirror and sent back through the compensator to the beam splitter for sending a portion of the returning beam to a detector. The first and second portions of the incoming light having differing path lengths interfere and the detector measures the fringes created.
REFERENCES:
patent: 3482919 (1969-12-01), Barringer
patent: 4286877 (1981-09-01), Clarke
patent: 4654530 (1987-03-01), Dybwad et al.
patent: 4684255 (1987-08-01), Ford
Davis John E.
Todd Marion
Boeing North American Inc.
Field Harry B.
Kahm Steven E.
Turner Samuel A.
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