| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas detection apparatus having high measurement accuracy while using an inexpensive apparatus of low input resolution when detecting states of gas such as the concentration and humidity of specific gas such as flammable gas. <P>SOLUTION: A flammable gas detection apparatus 1 includes a heating resistor 34 to be exposed to an atmosphere to be detected and an energization control circuit 50 for controlling the heating resistor 34 at two different temperatures, and when controlling the heating resistor 34 at the different temperatures, detects respective output voltages on both ends of the heating resistor 34 corresponding to the different temperatures and finds out states of the gas based on the output voltages. The flammable gas detection apparatus 1 includes also first and second amplifier circuits 101, 102 and first and second offset circuits 103, 104, sets two different offset voltages, amplifies respective potential differences obtained by subtracting respective offset voltages from respective output voltages, and finds of the states of the gas based on respective amplified voltages. <P>COPYRIGHT: (C)2013,JPO&INPIT |
