Fast dew point hygrometer with silicon integrated detector—Optimization of dynamic properties

Weremczuk, Jerzy; Tarapata, Grzegorz; Paczesny, Daniel; Jachowicz, Ryszard

doi:10.1016/j.sna.2006.02.017

Cited by 23 publications

(6 citation statements)

References 3 publications

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“…Due to gas-liquid shift on the surface of the quartz crystal during the active condensation processes, a change in the motional impedance is caused, represented by theΔL andΔR in Eq. (5,6). By combining the circuit model of the Colpitts oscillator ( Fig.3b) with the equivalent circuit model of the resonator (Fig.2b), total responses varying with the humidity during the condensation are simulated.…”

Section: Resultsmentioning

confidence: 99%

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Analysis of Mechanism of Dew Point Measurement Using a Colpitts Oscillation Circuit

Wang¹,

Meng²,

Yang³

2015

Proceedings of the 2015 4th International Conference on Computer, Mechatronics, Control and Electronic Engineering

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In this paper, based on the phenomenon that Colpitts oscillation circuit is hard to work when condensation occurs on the surface of the quartz crystal, a new dew point measurement device is developed, and it is mainly composed of a quartz crystal and a Peltier module. This measurement way is both rapid and reversible compared to the traditional methods. Wet sensitive characteristics of the quartz crystal, which is regarded as the humidity sensing element in Colpitts oscillator, is analyzed. The electrical parameters of the quartz crystal are changed due to proactive condensation, then vibration of oscillator will stop if the magnitude of the reactance of the quartz crystal is lower than the reactance threshold of the Colpitts circuit. Combining the theoretical analysis with experiment data, it indicates that the Colpitts circuit is feasible to measure dew point.

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Section: Resultsmentioning

confidence: 99%

“…In the dew point measurement, the detection and recognition of dew point are viewed as the key technology. The typical recognition way of dew point is making use of a Peltier module and an optical emitter-detector [5,6]. However, the detection system is easily affected by dust and pressure.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Mechanism of Dew Point Measurement Using a Colpitts Oscillation Circuit

Wang¹,

Meng²,

Yang³

2015

Proceedings of the 2015 4th International Conference on Computer, Mechatronics, Control and Electronic Engineering

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“…The developed QCM dew/frost sensor has measurement errors of < ±0.2 • C at temperatures greater than −60 • C, as compared with ±0.2 • C for optical dew-point hygrometers [25] and ±0.3 • C ∼ ±0.5 • C for other types of dewpoint detectors, e.g. laser dew-point hygrometers [27,28], impedance dew-point detectors [29] and evanescent field detection techniques [30]. This demonstrates that the QCM dew/frost-point sensor has similar accuracy to other dewpoint sensors for temperatures greater than −60 • C. In contrast, while optical dew-point hygrometers exhibit poor performance, low sensitivity due to the optical detection limit and long response time, etc, at dew/frost points below −70 • C (even though some commercial optical chilled mirror hygrometers show good accuracy of ± 0.1 • C in the range below −70 • C), the QCM dew/frost-point sensor we have developed maintains reasonable accuracy even for very low dew/frost points with errors in the range ±0.…”

Section: Dew/frost-point Measurementmentioning

confidence: 98%

Accurate dew-point measurement over a wide temperature range using a quartz crystal microbalance dew-point sensor

Kwon¹,

Kim²,

Choi³

2008

Meas. Sci. Technol.

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Quartz crystal microbalance (QCM) dew-point sensors are based on frequency measurement, and so have fast response time, high sensitivity and high accuracy. Recently, we have reported that they have the very convenient attribute of being able to distinguish between supercooled dew and frost from a single scan through the resonant frequency of the quartz resonator as a function of the temperature. In addition to these advantages, by using three different types of heat sinks, we have developed a QCM dew/frost-point sensor with a very wide working temperature range (−90 • C to 15 • C). The temperature of the quartz surface can be obtained effectively by measuring the temperature of the quartz crystal holder and using temperature compensation curves (which showed a high level of repeatability and reproducibility). The measured dew/frost points showed very good agreement with reference values and were within ±0.1 • C over the whole temperature range.

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“…A silicon MEMS sensor has been designed to replace the mirror in a conventional dew point hygrometer with an electrical thermometer inside (usually a Pt 100 thermoresistor) and an optical dew detector [16]. The silicon MEMS structure contains three integrated devices: the interdigitated capacitive dew detector, the thermoresistor and the heater (figures 3 and 4).…”

Section: Silicon Mems Sensor Of Dew Point Temperaturementioning

confidence: 99%

A MEMS-based super fast dew point hygrometer—construction and medical applications

Jachowicz¹,

Weremczuk²,

Paczesny³

et al. 2009

Meas. Sci. Technol.

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The paper shows how MEMS (micro-electro-mechanical system) technology and a modified principle of fast temperature control (by heat injection instead of careful control of cooling) can considerably improve the dynamic parameters of dew point hygrometers. Some aspects of MEMS-type integrated sensor construction and technology, whole measurement system design, the control algorithm to run the system as well as empirical dynamic parameters from the tests are discussed too. The hygrometer can easily obtain five to six measurements per second with an uncertainty of less than 0.3 K. The meter range is between −10 °C and 40 °C dew point. In the second part of the paper (section 2), two different successful applications in medicine based on fast humidity measurements have been discussed. Some specific constructions of these super fast dew point hygrometers based on a MEMS sensor as well as limited empirical results from clinical tests have been reported too.

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Fast dew point hygrometer with silicon integrated detector—Optimization of dynamic properties

Cited by 23 publications

References 3 publications

Analysis of Mechanism of Dew Point Measurement Using a Colpitts Oscillation Circuit

Analysis of Mechanism of Dew Point Measurement Using a Colpitts Oscillation Circuit

Accurate dew-point measurement over a wide temperature range using a quartz crystal microbalance dew-point sensor

A MEMS-based super fast dew point hygrometer—construction and medical applications

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