Selective chemical detection by energy modulation of sensors
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- Assignee:
- Dept. of Energy
- Application Number:
- ON: DE86013724
- OSTI ID:
- 5431571
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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