Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1984-11-29
1987-03-17
McGraw, Vincent P.
Optics: measuring and testing
By particle light scattering
With photocell detection
356361, G01B 902
Patent
active
046503293
ABSTRACT:
An optical device for obtaining a 3-dimensional signature or a plurality of 2-dimensional signatures for a given sample in order to detect predetermined chemical agents. The device comprises a light channel with a first sensing optical fiber with a coating thereon which changes its absorptive and refractive properties in the presence of a predetermined chemical agent, and a second light channel with a reference optical fiber isolated from the sample. A scanning monochromator is utilized to apply light beams to the sensing and reference fibers, and an optical detector is used to cross-correlate the outputs from the sensing and reference fibers. A variable optical delay line is disposed in one of the fiber channels in order to scan from 0.degree. to 360.degree. in phase shift for each light frequency. A 2-dimensional cross-correlation is obtained for this scan at this frequency. The scanning monochromator is set to run through a series of light frequencies in a given bandwidth. A 2-dimensional cross-correlation phase scan is obtained at each different light frequency. A 3-dimensional cross-correlation may then be obtained (cross-correlation value vs frequency vs phase delay) to provide a signature for a given sample which can be compared to known samples. The device may utilize separate channel bandwidth filters to obtain squeezed states and high S/N ratios.
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Barrett Terence W.
Giuliani John F.
Ellis William T.
McGraw Vincent P.
Sheinbein Sol
The United States of America as represented by the Secretary of
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