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Title: Selective chemical detection by energy modulation of sensors

Abstract

A portable instrument for use in the field in detecting, identifying, and quantifying a component of a sampled fluid includes a sensor which chemically reacts with the component of interest or a derivative thereof, an electrical heating filament for heating the sample before it is applied to the sensor, and modulator for continuously varying the temperature of the filament (and hence the reaction rate) between two values sufficient to produce the chemical reaction. In response to this thermal modulation, the sensor produces a modulated output signal, the modulation of which is a function of the activation energy of the chemical reaction, which activation energy is specific to the particular component of interest and its concentration. Microprocessor which compares the modulated output signal with standard responses for a plurality of components to identify and quantify the particular component of interest. In particular, the concentration of the component of interest is proportional to the amplitude of the modulated output signal, while the identifying activation output energy of the chemical interaction indicative of that component is proportional to a normalized parameter equal to the peak-to-peak amplitude divided by the height of the upper peaks above a base line signal level. 5 figures.

Inventors:
;
Issue Date:
OSTI Identifier:
7084742
Patent Number(s):
5047352 A
Application Number:
PPN: US 7-300206
Assignee:
Arch Development Corporation, Argonne, IL (United States)
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Resource Relation:
Patent File Date: 23 Jan 1989
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; FLUIDS; CHEMICAL ANALYSIS; MEASURING INSTRUMENTS; DESIGN; COMPUTERIZED CONTROL SYSTEMS; CONCENTRATION RATIO; DATA ANALYSIS; OPERATION; TEMPERATURE CONTROL; CONTROL; CONTROL SYSTEMS; ON-LINE CONTROL SYSTEMS; ON-LINE SYSTEMS; 400102* - Chemical & Spectral Procedures

Citation Formats

Stetter, J R, and Otagawa, T. Selective chemical detection by energy modulation of sensors. United States: N. p., 1991. Web.
Stetter, J R, & Otagawa, T. Selective chemical detection by energy modulation of sensors. United States.
Stetter, J R, and Otagawa, T. Tue . "Selective chemical detection by energy modulation of sensors". United States.
@article{osti_7084742,
title = {Selective chemical detection by energy modulation of sensors},
author = {Stetter, J R and Otagawa, T},
abstractNote = {A portable instrument for use in the field in detecting, identifying, and quantifying a component of a sampled fluid includes a sensor which chemically reacts with the component of interest or a derivative thereof, an electrical heating filament for heating the sample before it is applied to the sensor, and modulator for continuously varying the temperature of the filament (and hence the reaction rate) between two values sufficient to produce the chemical reaction. In response to this thermal modulation, the sensor produces a modulated output signal, the modulation of which is a function of the activation energy of the chemical reaction, which activation energy is specific to the particular component of interest and its concentration. Microprocessor which compares the modulated output signal with standard responses for a plurality of components to identify and quantify the particular component of interest. In particular, the concentration of the component of interest is proportional to the amplitude of the modulated output signal, while the identifying activation output energy of the chemical interaction indicative of that component is proportional to a normalized parameter equal to the peak-to-peak amplitude divided by the height of the upper peaks above a base line signal level. 5 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {9}
}