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Title: Fiber optic hydrogen sensor

Abstract

An apparatus and method are described for detecting a chemical substance by exposing an optic fiber having a core and a cladding to the chemical substance so that the chemical substance can be adsorbed onto the surface of the cladding. The optic fiber is coiled inside a container having a pair of valves for controlling the entrance and exit of the substance. Light from a light source is received by one end of the optic fiber, preferably external to the container, and carried by the core of the fiber. Adsorbed substance changes the transmissivity of the fiber as measured by a spectrophotometer at the other end, also preferably external to the container. Hydrogen is detected by the absorption of infrared light carried by an optic fiber with a silica cladding. Since the adsorption is reversible, a sensor according to the present invention can be used repeatedly. Multiple positions in a process system can be monitored using a single container that can be connected to each location to be monitored so that a sample can be obtained for measurement, or, alternatively, containers can be placed near each position and the optic fibers carrying the partially-absorbed light can be multiplexed for rapidmore » sequential reading by a single spectrophotometer. 4 figs.« less

Inventors:
;
Issue Date:
OSTI Identifier:
7049921
Patent Number(s):
5153931 A
Application Number:
PPN: US 7-678520
Assignee:
PTO; EDB-94-086996
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Resource Relation:
Patent File Date: 1 Apr 1991
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; HYDROGEN METERS; DESIGN; CHEMICAL COATING; CHEMISORPTION; INFRARED RADIATION; OPERATION; OPTICAL FIBERS; SPECTROPHOTOMETRY; CHEMICAL REACTIONS; DEPOSITION; ELECTROMAGNETIC RADIATION; FIBERS; MEASURING INSTRUMENTS; METERS; RADIATIONS; SEPARATION PROCESSES; SORPTION; SURFACE COATING; 080800* - Hydrogen- Properties & Composition

Citation Formats

Buchanan, B.R., and Prather, W.S. Fiber optic hydrogen sensor. United States: N. p., 1992. Web.
Buchanan, B.R., & Prather, W.S. Fiber optic hydrogen sensor. United States.
Buchanan, B.R., and Prather, W.S. Tue . "Fiber optic hydrogen sensor". United States.
@article{osti_7049921,
title = {Fiber optic hydrogen sensor},
author = {Buchanan, B.R. and Prather, W.S.},
abstractNote = {An apparatus and method are described for detecting a chemical substance by exposing an optic fiber having a core and a cladding to the chemical substance so that the chemical substance can be adsorbed onto the surface of the cladding. The optic fiber is coiled inside a container having a pair of valves for controlling the entrance and exit of the substance. Light from a light source is received by one end of the optic fiber, preferably external to the container, and carried by the core of the fiber. Adsorbed substance changes the transmissivity of the fiber as measured by a spectrophotometer at the other end, also preferably external to the container. Hydrogen is detected by the absorption of infrared light carried by an optic fiber with a silica cladding. Since the adsorption is reversible, a sensor according to the present invention can be used repeatedly. Multiple positions in a process system can be monitored using a single container that can be connected to each location to be monitored so that a sample can be obtained for measurement, or, alternatively, containers can be placed near each position and the optic fibers carrying the partially-absorbed light can be multiplexed for rapid sequential reading by a single spectrophotometer. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {10}
}