Patent ID: 8485720

Claim:
A measurement method of distinguishing dew and frost point using a quartz crystal microbalance dew-point sensor in low temperature, the method comprises the steps of: measuring a resonant frequency of a quartz crystal microbalance dew-point sensor while dropping temperature; observing shock waves of the resonant frequency; and determining dew point or frost point through the observation of the resonant frequency and shock waves of the quartz crystal microbalance dew-point sensor; wherein when observing the resonant frequency of a quartz resonator in the quartz crystal microbalance dew-point sensor while dropping temperature, it is judged that the temperature is the dew point if a transition phenomenon of the shock wave and the resonant frequency is observed in a resonant frequency pattern of the quartz resonator and the temperature is the frost point if the transition phenomenon of the shock wave and the resonant frequency is not observed.