Patent ID: 8224198
Filing Date: 2012-07-17
Classification: G01N,G03G

Abstract:
1. A humidity detecting device comprising: a humidity sensor that detects a humidity based on a change in an impedance, and that generates a humidity detection signal based on an applied alternating current (AC) voltage; an applying unit that applies the AC voltage to the humidity sensor; a detecting unit that detects a first impedance of the humidity sensor based on a first frequency of the AC voltage, and that detects a second impedance of the humidity sensor based on a second frequency of the AC voltage, wherein the first frequency and the second frequency are different; a switching unit that switches a frequency of the AC voltage to one of the first frequency and the second frequency; a temperature sensor that detects an ambient temperature of the humidity sensor; a processor; and memory operatively coupled to the processor and storing computer readable instructions that, when executed by the processor, cause the humidity detecting device to function as: