| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a detection method of the gas concentration capable of detecting the specific gas concentration more accurately, even when the temperature of a measuring gas is fluctuated. <P>SOLUTION: Assuming that a set voltage is V1", in the range between the minimum voltage V1 in a first limiting current region in a detection upper limit concentration and at a detection lower limit temperature of the specific gas and the maximum voltage V1' in the first limiting current region in a detection lower limit concentration and at a detection upper limit temperature, and that a set voltage is V2", in the range between the minimum voltage V2 in a second limiting current region in the detection upper limit concentration and at the detection lower limit temperature of the specific gas and the maximum voltage V2' in the second limiting current region in the detection lower limit concentration and at the detection upper limit temperature, an alternating voltage fluctuating between V1" and V2" is applied between a pair of electrodes of a sensor cell 4, and the specific gas concentration in the measuring gas is detected based on a current value in a constant current region generated by a current change when the alternating voltage is applied. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
