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Fiber-Optic Analysis Device

IP.com Disclosure Number: IPCOM000038342D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31

Publishing Venue

IBM

Related People

Authors:
Awschalom, DD [+details]

Abstract

A simple nonperturbing optical probe is described which allows either static or dynamic selective detection of gases or liquids. The device may be utilized over an extremely wide range of densities and temperatures, including hazardous environments, for scientific or technical applications. The technique employs a simple optical fiber from which the cladding has been removed (easily done chemically). The resulting fiber core is "leaky" so that light propagating through the core will leak out as a result of the coupling of the evanescent wave with the surrounding medium (see Fig. l). Due to the delicate nature of the evanescent wave, the amount of light leaking from the fiber will be extraordinarily sensitive to its surrounding environment.