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Sensors 2016, 16(11), 1944; doi:10.3390/s16111944

Dew Point Calibration System Using a Quartz Crystal Sensor with a Differential Frequency Method

Science and Technology on Inertial Laboratory, Beihang University, Beijing 100191, China
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Author to whom correspondence should be addressed.
Academic Editor: Stephane Evoy
Received: 12 October 2016 / Revised: 9 November 2016 / Accepted: 15 November 2016 / Published: 18 November 2016
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, the influence of temperature on quartz crystal microbalance (QCM) sensor response during dew point calibration is investigated. The aim is to present a compensation method to eliminate temperature impact on frequency acquisition. A new sensitive structure is proposed with double QCMs. One is kept in contact with the environment, whereas the other is not exposed to the atmosphere. There is a thermal conductivity silicone pad between each crystal and a refrigeration device to keep a uniform temperature condition. A differential frequency method is described in detail and is applied to calibrate the frequency characteristics of QCM at the dew point of −3.75 °C. It is worth noting that frequency changes of two QCMs were approximately opposite when temperature conditions were changed simultaneously. The results from continuous experiments show that the frequencies of two QCMs as the dew point moment was reached have strong consistency and high repeatability, leading to the conclusion that the sensitive structure can calibrate dew points with high reliability. View Full-Text
Keywords: differential frequency; dew point; quartz crystal sensor; spectrum analysis differential frequency; dew point; quartz crystal sensor; spectrum analysis
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Lin, N.; Meng, X.; Nie, J. Dew Point Calibration System Using a Quartz Crystal Sensor with a Differential Frequency Method. Sensors 2016, 16, 1944.

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