Accession Number : ADD012786

Title :   Optical 3-D Signature Device for Detecting Chemical Agents.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Barrett,Terence W ; Giuliani,John F

Report Date : 17 Mar 1987

Pagination or Media Count : 10

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 to 360 in phase shift for each light frequency. A-2 -dimensional cross correlation is obtained for this scan at this scan at this frequency. The scanning monochromator is set to run through a series of light frequencies in a given bandwidth.

Descriptors :   *PATENTS, *OPTICAL DETECTORS, *CHEMICAL AGENTS, *DETECTION, COATINGS, DELAY LINES, DETECTION, FIBER OPTICS, FIBERS, FREQUENCY, LIGHT, MONOCHROMATORS, ABSORPTION, CHANNELS, CHEMICAL AGENTS, OPTICAL EQUIPMENT, OPTICAL PROPERTIES, PHASE SHIFT, REFRACTION, SCANNING, VARIABLES

Subject Categories : Optical Detection and Detectors
      Chemical, Biological and Radiological Warfare

Distribution Statement : APPROVED FOR PUBLIC RELEASE