Gas detection device and method for detecting gas
First Claim
1. A gas detection device for detecting concentration of any one of predetermined different gases in a gas mixture, said device comprising a substrate, a plurality of gas adsorbing sensors formed on said substrate, each of said sensors having different gas selectivities to the gases in the gas mixture, the number of said sensors being equal to the number of the different gases to be detected, at least two sensors being sensitive to at least two gases but having different sensitivities to said at least two gases, and each of said sensors adapted to provide an output having one or more output components, each component having a dimension of electrical conductivity and being proportional to the concentration of one of said different gases within a predetermined range of temperature of the sensor, said output of each sensor being the sum of said one or more output components, and means for computing the gas concentration of said any one of predetermined different gases using the outputs of said sensors produced at a temperature within said range.
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Abstract
A gas detection device and a method for detecting a gas where gas information including concentrations of gas components in a mixed gas, concentration, presence of specific gas components and the like is detected by measuring, e.g., the output voltages of a plurality of gas sensors having different gas selectivities. The gas selectivities, as a characteristic constant of the specific gas sensor, was previously determined. The measured output voltages and gas selectivities are then used for solving plural simultaneous equations for gas concentrations.
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Citations
21 Claims
- 1. A gas detection device for detecting concentration of any one of predetermined different gases in a gas mixture, said device comprising a substrate, a plurality of gas adsorbing sensors formed on said substrate, each of said sensors having different gas selectivities to the gases in the gas mixture, the number of said sensors being equal to the number of the different gases to be detected, at least two sensors being sensitive to at least two gases but having different sensitivities to said at least two gases, and each of said sensors adapted to provide an output having one or more output components, each component having a dimension of electrical conductivity and being proportional to the concentration of one of said different gases within a predetermined range of temperature of the sensor, said output of each sensor being the sum of said one or more output components, and means for computing the gas concentration of said any one of predetermined different gases using the outputs of said sensors produced at a temperature within said range.
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18. A method for detecting concentration of any one of predetermined different gases in a gas mixture, utilizing a plurality of gas adsorbing sensors equal in number to the number of the different gases to be detected, each of the gas sensors having a different gas selectivity, at least two sensors being sensitive to at least two gas components but having different sensitivities to said at least two gas components, which comprises detecting an output voltage of each of the individual gas sensors having different gas selectivities, and computing the concentration of any one of the predetermined different gases from the detected output voltages by solving the n simultaneous equations:
- ##EQU3## wherein Pi;
detected output voltages generated by total gas components from sensor i,m;
number of gas sensors,n;
number of gas components in a sample gas,Xj;
concentration of specific gas component j,α
ij;
sensitivity of sensor i to specific gas component j, a constant value. - View Dependent Claims (19, 20, 21)
- ##EQU3## wherein Pi;
Specification