| 摘要 |
PROBLEM TO BE SOLVED: To determine the dew point in a non-optical manner without condensation by measuring the temperature of a quartz crystal resonator(QCR) stored in a pressure vessel by a temperature sensor, and monitoring the frequency of the QCR. SOLUTION: In a dew point sensor 100, a QCR 112 is stored in a pressure vessel 104, and closely attached to a temperature control plate 110. A temperature sensor 114 is arranged so as to generate the signal indicating the temperature of the QCR 112. A circuit 116 is connected to the QCR 112 and the temperature sensor 114, the temperature of the QCR 112 is controlled to calculate the dew point value of a fuel flow 118, and the frequency of the QCR 112 is measured and monitored. The circuit 116 includes a computer 119 to process the signal and to give the reported dew point and the display. Since the change in frequency is detected, the temperature at which the frequency is changed is not affected even when a pollutant is deposited on the crystal. The dew point sensor 100 is capable of measuring the dew point even if the condensate is water or organic matters.
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