| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas concentration detector capable of detecting accurately a gas concentration without being affected by a gas temperature of measured gas. SOLUTION: A first resistance/voltage conversion circuit 20 supplies a current with a level capable of making a temperature of a temperature measuring resistor Rs higher than a peripheral temperature, to the temperature measuring resistor Rs, to generate a voltage▵V11 in response to a resistance value of the temperature measuring resistor Rs. A second resistance/voltage conversion circuit 21 supplies a current with a level capable of making a temperature of a temperature measuring resistor Rt equal to the peripheral temperature, to the temperature measuring resistor Rt, to generate a voltage▵V21 in response to a resistance value of the temperature measuring resistor Rt. A CPU 25a detects the voltages▵V11,▵V21 in response to the resistance values of the temperature measuring resistors Rs, Rt generated by the first and second resistance/voltage conversion circuits 20, 21, and the gas concentration is detected based on the voltages▵V11,▵V21. COPYRIGHT: (C)2008,JPO&INPIT |
