Title :
Gas dependent response in temperature transient of SnO/sub 2/ gas sensor
Author :
Hiranaka, Y. ; Abe, T.
Author_Institution :
Dept. of Electr. & Inf. Eng., Yamagata Univ., Yonezawa, Japan
Abstract :
The authors describe the gas dependent response observed in transient conductance patterns of a SnO/sub 2/ gas sensor caused by surface temperature changes, and its relationships to sensor variations. SnO/sub 2/ gas sensors were investigated for gas identification. The underlying objective was to determine how to extract the gas-specific information to the fullest extent from a single gas sensor. A temperature transient method was used. A stepwise change in heater voltage for the sensor caused a conductance change of the sensor, which showed a gas dependent transient response. The transient responses were examined after dividing them by the conductance response measured in clean air, and distinctive peaks of the response were observed. The peak times depend on each particular gas species. Therefore this method is useful for identifying gas species. The characteristics of several types of gas sensors were also studied.<>
Keywords :
chemical variables measurement; electric sensing devices; electrical conductivity of crystalline semiconductors and insulators; gas sensors; semiconductor devices; semiconductor materials; tin compounds; transients; SnO/sub 2/ gas sensor; clean air; conductance; gas dependent response; gas identification; heater voltage; organic compounds; surface temperature changes; temperature transient; transient conductance patterns; transient responses; Data mining; Gas detectors; Power measurement; Sensor phenomena and characterization; Temperature control; Temperature dependence; Temperature sensors; Thermal sensors; Transient response; Voltage;
Conference_Titel :
Solid-State Sensors and Actuators, 1991. Digest of Technical Papers, TRANSDUCERS '91., 1991 International Conference on
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-87942-585-7
DOI :
10.1109/SENSOR.1991.148827
