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Title: Fiber optic device for sensing the presence of a gas

Abstract

A fiber-optic device for sensing the presence of a gas in an environment is provided. The device comprises a light source for directing a light beam to a layer system having a first surface and a second surface opposite the first surface. The first surface is exposable to the light beam and the second surface is exposable to the environment. A first light portion encounters and reflects from the first surface at an angle of incidence free from optical wave guide resonance phenomenon and the second light portion encounters and reflects from the first surface at an angle of incidence enabling an optical wave guide resonance phenomenon. The layer system is selected to reversibly react with the gas to be detected. The reaction between the gas and the material changes the material`s optical properties and the wavelength at which the optical wave guide resonance occurs. Furthermore, a mechanism for measuring the intensity of the reflected first light portion relative to the reflected second light portion is provided with the ratio of the first and second light portions indicating the concentration of the gas presence in the environment. 5 figs.

Inventors:
; ;
Issue Date:
Research Org.:
Midwest Research Institute, Kansas City, MO (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
570446
Patent Number(s):
5708735
Application Number:
PAN: 8-624,112
Assignee:
PTO; SCA: 440800; PA: EDB-98:029831; SN: 98001912343
DOE Contract Number:  
AC36-83CH10093
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 13 Jan 1998
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; MONITORS; GAS ANALYSIS; FIBER OPTICS; VISIBLE RADIATION; DESIGN; OPTICAL PROPERTIES; REFLECTION; MEASURING METHODS

Citation Formats

Benson, D K, Bechinger, C S, and Tracy, C E. Fiber optic device for sensing the presence of a gas. United States: N. p., 1998. Web.
Benson, D K, Bechinger, C S, & Tracy, C E. Fiber optic device for sensing the presence of a gas. United States.
Benson, D K, Bechinger, C S, and Tracy, C E. Tue . "Fiber optic device for sensing the presence of a gas". United States.
@article{osti_570446,
title = {Fiber optic device for sensing the presence of a gas},
author = {Benson, D K and Bechinger, C S and Tracy, C E},
abstractNote = {A fiber-optic device for sensing the presence of a gas in an environment is provided. The device comprises a light source for directing a light beam to a layer system having a first surface and a second surface opposite the first surface. The first surface is exposable to the light beam and the second surface is exposable to the environment. A first light portion encounters and reflects from the first surface at an angle of incidence free from optical wave guide resonance phenomenon and the second light portion encounters and reflects from the first surface at an angle of incidence enabling an optical wave guide resonance phenomenon. The layer system is selected to reversibly react with the gas to be detected. The reaction between the gas and the material changes the material`s optical properties and the wavelength at which the optical wave guide resonance occurs. Furthermore, a mechanism for measuring the intensity of the reflected first light portion relative to the reflected second light portion is provided with the ratio of the first and second light portions indicating the concentration of the gas presence in the environment. 5 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}