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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 modulating means 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 means compares the modulated output signal with standard responses for a plurality of components to identify and quantify the particular component of interest. 4 figs.

Inventors:
;
Issue Date:
Research Org.:
Argonne National Lab., IL (USA)
OSTI Identifier:
5431571
Application Number:
ON: DE86013724
Assignee:
Dept. of Energy ANL; ERA-11-005510; EDB-86-138041
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 47 OTHER INSTRUMENTATION; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AIR; CHEMICAL REACTIONS; GAS ANALYSIS; QUANTITATIVE CHEMICAL ANALYSIS; HAZARDOUS MATERIALS; POTENTIOMETERS; DESIGN; TOXIC MATERIALS; ACTIVATION ENERGY; CATALYSIS; CHEMICAL COMPOSITION; CHEMICAL REACTION KINETICS; FIELD TESTS; FREQUENCY MODULATION; HYDROCARBONS; QUANTITY RATIO; THERMAL CYCLING; CHEMICAL ANALYSIS; ELECTRIC MEASURING INSTRUMENTS; ELECTRICAL EQUIPMENT; ENERGY; EQUIPMENT; FLUIDS; GASES; KINETICS; MATERIALS; MEASURING INSTRUMENTS; MODULATION; ORGANIC COMPOUNDS; REACTION KINETICS; TESTING; 500200* - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989); 440300 - Miscellaneous Instruments- (-1989); 400102 - Chemical & Spectral Procedures

Citation Formats

Stetter, J.R., and Otagawa, T. Selective chemical detection by energy modulation of sensors. United States: N. p., 1985. Web.
Stetter, J.R., & Otagawa, T. Selective chemical detection by energy modulation of sensors. United States.
Stetter, J.R., and Otagawa, T. Mon . "Selective chemical detection by energy modulation of sensors". United States.
@article{osti_5431571,
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 modulating means 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 means compares the modulated output signal with standard responses for a plurality of components to identify and quantify the particular component of interest. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {5}
}