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Title: Optical sensing elements for nitrogen dioxide (NO.sub.2) gas detection, a sol-gel method for making the sensing elements and fiber optic sensors incorporating nitrogen dioxide gas optical sensing elements

A sensing element, a method of making a sensing element, and a fiber optic sensor incorporating the sensing element are described. The sensor can be used for the quantitative detection of NO.sub.2 in a mixture of gases. The sensing element can be made by incorporating a diazotizing reagent which reacts with nitrous ions to produce a diazo compound and a coupling reagent which couples with the diazo compound to produce an azo dye into a sol and allowing the sol to form an optically transparent gel. The sensing element changes color in the presence of NO.sub.2 gas. The temporal response of the absorption spectrum at various NO.sub.2 concentrations has also been recorded and analyzed. Sensors having different design configurations are described. The sensing element can detect NO.sub.2 gas at levels of parts per billion.
Inventors:
 [1];  [2]
  1. Mississippi State, MS
  2. Starkville, MS
Issue Date:
OSTI Identifier:
913244
Assignee:
Mississippi State University (Mississippi State, MS) NETL
Patent Number(s):
7,239,766
Application Number:
10/693,519
Contract Number:
FC26-98FT40395
Research Org:
Mississippi State University (Mississippi State, MS)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
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