| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an alcohol concentration detector capable of accurately detecting alcohol concentration. <P>SOLUTION: An alcohol concentration detector 1 includes: an electrode part 65; a switched capacitor circuit 70; a standard voltage generation circuit 80; an amplifier circuit 90; and a control part 100. The switched capacitor circuit 70 converts capacitance Cp at the electrode part 65 into detection voltage Vb. The amplifier circuit 90 amplifies the detection voltage Vb to be output. The control part 100 acquires output voltage Voutγ amplified by an amplification degree γ, and output voltage Voutβ amplified by an amplification degree β, and corrects the amplification degree β based on the output voltage Voutγ, Voutβ, and the amplification degree γ. By correcting the amplification degree, generation of difference in alcohol concentration to be calculated by the amplification degree due to influences by an error, etc. can be avoided, and the alcohol concentration in liquid can be accurately detected. <P>COPYRIGHT: (C)2012,JPO&INPIT |
