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Xiaofeng Meng - One of the best experts on this subject based on the ideXlab platform.

  • swelling characteristics and application of two dimensional materials on hydrophilic quartz crystal resonant Dew Point sensor
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Qiyang Huang, Sunxiang Zheng, Monong Wang, Xiaofeng Meng, Ning Li, Baoxia Mi
    Abstract:

    Abstract The two-dimensional (2D) water adsorbing material is used as a sensitive layer for the hydrophilic quartz crystal resonant (QCR) Dew Point sensor, and its own swelling characteristics determine the accuracy of the sensor's recognition of the saturation status of the water vapor. In order to reveal the mechanism relationship between the swelling characteristics of materials and the measurement accuracy of hydrophilic QCR Dew Point sensors using different 2D materials, we used montmorillonite (MTT), graphene oxide (GO) and molybdenum disulfide (MoS2) coated QCR sensors to test Dew Point measurement performance in different humidity environment, and then the rate of swelling and intensity of swelling of the three materials were measured by integration of quartz crystal microbalance with dissipation (QCM-D) and ellipsometer. The results showed that MTT had an outstanding swelling rate and intensity with logrithmatic thickness changing curve, especially in the high humidity environment with sudden strength changes. This characteristic makes MTT the most suitable sensitive material for the hydrophilic QCR Dew Point sensor surface modification among the three 2D materials. Through this study, it implied that the rate of swelling and intensity of swelling are the two major parameters that determines whether a 2D material is suitable for being used as the sensitivity layer of a hydrophilic QCR Dew Point sensor.

  • Dew Point measurements using montmorillonite mtt and molybdenum disulfide mos2 coated qcm sensors
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Ning Li, Zhongying Wang, Yichuan Wu, Mingjing Qi, Qiyang Huang, Xiaofeng Meng, Baoxia Mi
    Abstract:

    Abstract Due to the influence of temperature, the traditional quartz crystal microbalance (QCM) Dew Point sensors require an independent study on the temperature frequency characteristics (TFC) for calibrations as the frequency response is susceptible to external interferences. QCM Dew Point sensors with either montmorillonite (MTT) or molybdenum disulfide (MoS2) coatings together with a Dew Point recognition algorithm are demonstrated for Dew Point recognitions. The frequency signals output from three kinds of QCM sensors are processed by the proposed recognition algorithm and compared with the standard Dew Point data provided by MICHELL S4000. The results show QCM sensors with MTT coating have the best accuracy and repeatability test for 5 days in range of 3 ℃ DP–15 ℃ DP environment has shown the maximum relative error as compared with the standard Dew-Point values is less than ±0.3 ℃ DP. As such, this work shows the feasibility of utilizing QCM humidity sensors without the influence of temperature on frequency measurements with good repeatability.

  • Dew Point measurements using montmorillonite mtt and molybdenum disulfide mos2 coated qcm sensors
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Ning Li, Zhongying Wang, Yichuan Wu, Mingjing Qi, Qiyang Huang, Xiaofeng Meng, Baoxia Mi
    Abstract:

    Abstract Due to the influence of temperature, the traditional quartz crystal microbalance (QCM) Dew Point sensors require an independent study on the temperature frequency characteristics (TFC) for calibrations as the frequency response is susceptible to external interferences. QCM Dew Point sensors with either montmorillonite (MTT) or molybdenum disulfide (MoS2) coatings together with a Dew Point recognition algorithm are demonstrated for Dew Point recognitions. The frequency signals output from three kinds of QCM sensors are processed by the proposed recognition algorithm and compared with the standard Dew Point data provided by MICHELL S4000. The results show QCM sensors with MTT coating have the best accuracy and repeatability test for 5 days in range of 3 ℃ DP–15 ℃ DP environment has shown the maximum relative error as compared with the standard Dew-Point values is less than ±0.3 ℃ DP. As such, this work shows the feasibility of utilizing QCM humidity sensors without the influence of temperature on frequency measurements with good repeatability.

  • Dew Point measurement using a carbon based capacitive sensor with active temperature control
    ACS Applied Materials & Interfaces, 2019
    Co-Authors: Jing Nie, Qiyang Huang, Sunxiang Zheng, Xiaofeng Meng, Nirav Joshi, Mi Zhang
    Abstract:

    Laser-induced graphene (LIG) has both good electrical conductivity and three-dimensional porous structures. Here, porous graphene interdigital electrodes (IDE) were constructed as a capacitive sensor from commercial polymer films by the laser ablation process and transferred to the polydimethylsiloxane (PDMS) substrate. The graphene oxide (GO) adsorption layer was electrosprayed as a humidity sensing structure, and a Peltier device was used to control the temperature to produce the condensation of water vapors. The Dew Point was identified by the equilibrium state of the capacitor when the adsorption layer and the surface air reached the saturation equilibrium. The performances of the hydrophilic Dew Point sensing system under different environmental conditions were investigated. The results show that the precision of the carbon-based Dew Point sensor of ≤±0.8 °C DP with good stability and repeatability is better than those of other Dew Point instrument based on electrical sensing parameters at ±1.0 °C DP.

  • Active temperature control of quartz resonant Dew Point sensors based on dual surface cooling
    Sensors and Actuators B-chemical, 2018
    Co-Authors: Xiaofeng Meng, Ning Li
    Abstract:

    Abstract The combination of the Peltier cooler and quartz crystal resonator (QCR) is critical for temperature-controlled, quartz resonant Dew Point sensors. As the environmental parameters continuous to change, the cooling effects on the QCR surface will cause unstable vibration changes for Dew Point sensing applications. In order to achieve continuous and accurate Dew Point measurements in a dynamically changing atmosphere, this paper presents a new scheme based on the dual surface cooling by connecting two Peltier coolers to both sides of the QCR using elastic thermal materials. The heat transfer performance and vibration characteristics of the QCR are simulated and analyzed, respectively. Simulation results show optimal parameters of the elastic thermal pad have the dimension of the ring structure with inner diameter of 5.2 mm and outer diameter of 8.6 mm. The prototype sensor is subjected to a Dew Point measurement test in the external environment with fluctuating conditions and results show the relative error of less than 0.06 °C at a cooling rate of 0.02 °C/s, which are as good as the commercial products. Furthermore, these data have been theoretically verified to measure the Dew Point in dynamically changing environments.

Ning Li - One of the best experts on this subject based on the ideXlab platform.

  • swelling characteristics and application of two dimensional materials on hydrophilic quartz crystal resonant Dew Point sensor
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Qiyang Huang, Sunxiang Zheng, Monong Wang, Xiaofeng Meng, Ning Li, Baoxia Mi
    Abstract:

    Abstract The two-dimensional (2D) water adsorbing material is used as a sensitive layer for the hydrophilic quartz crystal resonant (QCR) Dew Point sensor, and its own swelling characteristics determine the accuracy of the sensor's recognition of the saturation status of the water vapor. In order to reveal the mechanism relationship between the swelling characteristics of materials and the measurement accuracy of hydrophilic QCR Dew Point sensors using different 2D materials, we used montmorillonite (MTT), graphene oxide (GO) and molybdenum disulfide (MoS2) coated QCR sensors to test Dew Point measurement performance in different humidity environment, and then the rate of swelling and intensity of swelling of the three materials were measured by integration of quartz crystal microbalance with dissipation (QCM-D) and ellipsometer. The results showed that MTT had an outstanding swelling rate and intensity with logrithmatic thickness changing curve, especially in the high humidity environment with sudden strength changes. This characteristic makes MTT the most suitable sensitive material for the hydrophilic QCR Dew Point sensor surface modification among the three 2D materials. Through this study, it implied that the rate of swelling and intensity of swelling are the two major parameters that determines whether a 2D material is suitable for being used as the sensitivity layer of a hydrophilic QCR Dew Point sensor.

  • Dew Point measurements using montmorillonite mtt and molybdenum disulfide mos2 coated qcm sensors
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Ning Li, Zhongying Wang, Yichuan Wu, Mingjing Qi, Qiyang Huang, Xiaofeng Meng, Baoxia Mi
    Abstract:

    Abstract Due to the influence of temperature, the traditional quartz crystal microbalance (QCM) Dew Point sensors require an independent study on the temperature frequency characteristics (TFC) for calibrations as the frequency response is susceptible to external interferences. QCM Dew Point sensors with either montmorillonite (MTT) or molybdenum disulfide (MoS2) coatings together with a Dew Point recognition algorithm are demonstrated for Dew Point recognitions. The frequency signals output from three kinds of QCM sensors are processed by the proposed recognition algorithm and compared with the standard Dew Point data provided by MICHELL S4000. The results show QCM sensors with MTT coating have the best accuracy and repeatability test for 5 days in range of 3 ℃ DP–15 ℃ DP environment has shown the maximum relative error as compared with the standard Dew-Point values is less than ±0.3 ℃ DP. As such, this work shows the feasibility of utilizing QCM humidity sensors without the influence of temperature on frequency measurements with good repeatability.

  • Dew Point measurements using montmorillonite mtt and molybdenum disulfide mos2 coated qcm sensors
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Ning Li, Zhongying Wang, Yichuan Wu, Mingjing Qi, Qiyang Huang, Xiaofeng Meng, Baoxia Mi
    Abstract:

    Abstract Due to the influence of temperature, the traditional quartz crystal microbalance (QCM) Dew Point sensors require an independent study on the temperature frequency characteristics (TFC) for calibrations as the frequency response is susceptible to external interferences. QCM Dew Point sensors with either montmorillonite (MTT) or molybdenum disulfide (MoS2) coatings together with a Dew Point recognition algorithm are demonstrated for Dew Point recognitions. The frequency signals output from three kinds of QCM sensors are processed by the proposed recognition algorithm and compared with the standard Dew Point data provided by MICHELL S4000. The results show QCM sensors with MTT coating have the best accuracy and repeatability test for 5 days in range of 3 ℃ DP–15 ℃ DP environment has shown the maximum relative error as compared with the standard Dew-Point values is less than ±0.3 ℃ DP. As such, this work shows the feasibility of utilizing QCM humidity sensors without the influence of temperature on frequency measurements with good repeatability.

  • Active temperature control of quartz resonant Dew Point sensors based on dual surface cooling
    Sensors and Actuators B-chemical, 2018
    Co-Authors: Xiaofeng Meng, Ning Li
    Abstract:

    Abstract The combination of the Peltier cooler and quartz crystal resonator (QCR) is critical for temperature-controlled, quartz resonant Dew Point sensors. As the environmental parameters continuous to change, the cooling effects on the QCR surface will cause unstable vibration changes for Dew Point sensing applications. In order to achieve continuous and accurate Dew Point measurements in a dynamically changing atmosphere, this paper presents a new scheme based on the dual surface cooling by connecting two Peltier coolers to both sides of the QCR using elastic thermal materials. The heat transfer performance and vibration characteristics of the QCR are simulated and analyzed, respectively. Simulation results show optimal parameters of the elastic thermal pad have the dimension of the ring structure with inner diameter of 5.2 mm and outer diameter of 8.6 mm. The prototype sensor is subjected to a Dew Point measurement test in the external environment with fluctuating conditions and results show the relative error of less than 0.06 °C at a cooling rate of 0.02 °C/s, which are as good as the commercial products. Furthermore, these data have been theoretically verified to measure the Dew Point in dynamically changing environments.

  • A New Type of Hydrophilic QCM Dew Point Sensor
    2018 IEEE SENSORS, 2018
    Co-Authors: Ning Li, Xiaofeng Meng, Qiyang Huang
    Abstract:

    In order to increase the sensitivity and enhance the recognition feature during the measurement of the Dew Point based on the active temperature-controlled quartz crystal microbalance (QCM) Dew Point sensor, a new hydrophilic QCM Dew Point sensor and Dew Point recognition method were proposed in this paper. In the sensor, the QCM coating with a reduced graphene oxide (rGO) thin film was used as the sensitive unit. Dew Point recognition method based on calculating the second derivative of the frequency variation curve was proposed to get the accurate Dew Point values. Experiments based on the designed sensor was carried out under different Dew Point conditions and the Dew Points were recognized by using the designed method. The results showed that the designed sensor had obvious Dew Point recognition feature and could achieve acceptable measurement error as less than 0.31°C compared with the precise Dew Point meter MICHELL 84000.

Qiyang Huang - One of the best experts on this subject based on the ideXlab platform.

  • swelling characteristics and application of two dimensional materials on hydrophilic quartz crystal resonant Dew Point sensor
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Qiyang Huang, Sunxiang Zheng, Monong Wang, Xiaofeng Meng, Ning Li, Baoxia Mi
    Abstract:

    Abstract The two-dimensional (2D) water adsorbing material is used as a sensitive layer for the hydrophilic quartz crystal resonant (QCR) Dew Point sensor, and its own swelling characteristics determine the accuracy of the sensor's recognition of the saturation status of the water vapor. In order to reveal the mechanism relationship between the swelling characteristics of materials and the measurement accuracy of hydrophilic QCR Dew Point sensors using different 2D materials, we used montmorillonite (MTT), graphene oxide (GO) and molybdenum disulfide (MoS2) coated QCR sensors to test Dew Point measurement performance in different humidity environment, and then the rate of swelling and intensity of swelling of the three materials were measured by integration of quartz crystal microbalance with dissipation (QCM-D) and ellipsometer. The results showed that MTT had an outstanding swelling rate and intensity with logrithmatic thickness changing curve, especially in the high humidity environment with sudden strength changes. This characteristic makes MTT the most suitable sensitive material for the hydrophilic QCR Dew Point sensor surface modification among the three 2D materials. Through this study, it implied that the rate of swelling and intensity of swelling are the two major parameters that determines whether a 2D material is suitable for being used as the sensitivity layer of a hydrophilic QCR Dew Point sensor.

  • Dew Point measurements using montmorillonite mtt and molybdenum disulfide mos2 coated qcm sensors
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Ning Li, Zhongying Wang, Yichuan Wu, Mingjing Qi, Qiyang Huang, Xiaofeng Meng, Baoxia Mi
    Abstract:

    Abstract Due to the influence of temperature, the traditional quartz crystal microbalance (QCM) Dew Point sensors require an independent study on the temperature frequency characteristics (TFC) for calibrations as the frequency response is susceptible to external interferences. QCM Dew Point sensors with either montmorillonite (MTT) or molybdenum disulfide (MoS2) coatings together with a Dew Point recognition algorithm are demonstrated for Dew Point recognitions. The frequency signals output from three kinds of QCM sensors are processed by the proposed recognition algorithm and compared with the standard Dew Point data provided by MICHELL S4000. The results show QCM sensors with MTT coating have the best accuracy and repeatability test for 5 days in range of 3 ℃ DP–15 ℃ DP environment has shown the maximum relative error as compared with the standard Dew-Point values is less than ±0.3 ℃ DP. As such, this work shows the feasibility of utilizing QCM humidity sensors without the influence of temperature on frequency measurements with good repeatability.

  • Dew Point measurements using montmorillonite mtt and molybdenum disulfide mos2 coated qcm sensors
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Ning Li, Zhongying Wang, Yichuan Wu, Mingjing Qi, Qiyang Huang, Xiaofeng Meng, Baoxia Mi
    Abstract:

    Abstract Due to the influence of temperature, the traditional quartz crystal microbalance (QCM) Dew Point sensors require an independent study on the temperature frequency characteristics (TFC) for calibrations as the frequency response is susceptible to external interferences. QCM Dew Point sensors with either montmorillonite (MTT) or molybdenum disulfide (MoS2) coatings together with a Dew Point recognition algorithm are demonstrated for Dew Point recognitions. The frequency signals output from three kinds of QCM sensors are processed by the proposed recognition algorithm and compared with the standard Dew Point data provided by MICHELL S4000. The results show QCM sensors with MTT coating have the best accuracy and repeatability test for 5 days in range of 3 ℃ DP–15 ℃ DP environment has shown the maximum relative error as compared with the standard Dew-Point values is less than ±0.3 ℃ DP. As such, this work shows the feasibility of utilizing QCM humidity sensors without the influence of temperature on frequency measurements with good repeatability.

  • Dew Point measurement using a carbon based capacitive sensor with active temperature control
    ACS Applied Materials & Interfaces, 2019
    Co-Authors: Jing Nie, Qiyang Huang, Sunxiang Zheng, Xiaofeng Meng, Nirav Joshi, Mi Zhang
    Abstract:

    Laser-induced graphene (LIG) has both good electrical conductivity and three-dimensional porous structures. Here, porous graphene interdigital electrodes (IDE) were constructed as a capacitive sensor from commercial polymer films by the laser ablation process and transferred to the polydimethylsiloxane (PDMS) substrate. The graphene oxide (GO) adsorption layer was electrosprayed as a humidity sensing structure, and a Peltier device was used to control the temperature to produce the condensation of water vapors. The Dew Point was identified by the equilibrium state of the capacitor when the adsorption layer and the surface air reached the saturation equilibrium. The performances of the hydrophilic Dew Point sensing system under different environmental conditions were investigated. The results show that the precision of the carbon-based Dew Point sensor of ≤±0.8 °C DP with good stability and repeatability is better than those of other Dew Point instrument based on electrical sensing parameters at ±1.0 °C DP.

  • A New Type of Hydrophilic QCM Dew Point Sensor
    2018 IEEE SENSORS, 2018
    Co-Authors: Ning Li, Xiaofeng Meng, Qiyang Huang
    Abstract:

    In order to increase the sensitivity and enhance the recognition feature during the measurement of the Dew Point based on the active temperature-controlled quartz crystal microbalance (QCM) Dew Point sensor, a new hydrophilic QCM Dew Point sensor and Dew Point recognition method were proposed in this paper. In the sensor, the QCM coating with a reduced graphene oxide (rGO) thin film was used as the sensitive unit. Dew Point recognition method based on calculating the second derivative of the frequency variation curve was proposed to get the accurate Dew Point values. Experiments based on the designed sensor was carried out under different Dew Point conditions and the Dew Points were recognized by using the designed method. The results showed that the designed sensor had obvious Dew Point recognition feature and could achieve acceptable measurement error as less than 0.31°C compared with the precise Dew Point meter MICHELL 84000.

Baoxia Mi - One of the best experts on this subject based on the ideXlab platform.

  • swelling characteristics and application of two dimensional materials on hydrophilic quartz crystal resonant Dew Point sensor
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Qiyang Huang, Sunxiang Zheng, Monong Wang, Xiaofeng Meng, Ning Li, Baoxia Mi
    Abstract:

    Abstract The two-dimensional (2D) water adsorbing material is used as a sensitive layer for the hydrophilic quartz crystal resonant (QCR) Dew Point sensor, and its own swelling characteristics determine the accuracy of the sensor's recognition of the saturation status of the water vapor. In order to reveal the mechanism relationship between the swelling characteristics of materials and the measurement accuracy of hydrophilic QCR Dew Point sensors using different 2D materials, we used montmorillonite (MTT), graphene oxide (GO) and molybdenum disulfide (MoS2) coated QCR sensors to test Dew Point measurement performance in different humidity environment, and then the rate of swelling and intensity of swelling of the three materials were measured by integration of quartz crystal microbalance with dissipation (QCM-D) and ellipsometer. The results showed that MTT had an outstanding swelling rate and intensity with logrithmatic thickness changing curve, especially in the high humidity environment with sudden strength changes. This characteristic makes MTT the most suitable sensitive material for the hydrophilic QCR Dew Point sensor surface modification among the three 2D materials. Through this study, it implied that the rate of swelling and intensity of swelling are the two major parameters that determines whether a 2D material is suitable for being used as the sensitivity layer of a hydrophilic QCR Dew Point sensor.

  • Dew Point measurements using montmorillonite mtt and molybdenum disulfide mos2 coated qcm sensors
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Ning Li, Zhongying Wang, Yichuan Wu, Mingjing Qi, Qiyang Huang, Xiaofeng Meng, Baoxia Mi
    Abstract:

    Abstract Due to the influence of temperature, the traditional quartz crystal microbalance (QCM) Dew Point sensors require an independent study on the temperature frequency characteristics (TFC) for calibrations as the frequency response is susceptible to external interferences. QCM Dew Point sensors with either montmorillonite (MTT) or molybdenum disulfide (MoS2) coatings together with a Dew Point recognition algorithm are demonstrated for Dew Point recognitions. The frequency signals output from three kinds of QCM sensors are processed by the proposed recognition algorithm and compared with the standard Dew Point data provided by MICHELL S4000. The results show QCM sensors with MTT coating have the best accuracy and repeatability test for 5 days in range of 3 ℃ DP–15 ℃ DP environment has shown the maximum relative error as compared with the standard Dew-Point values is less than ±0.3 ℃ DP. As such, this work shows the feasibility of utilizing QCM humidity sensors without the influence of temperature on frequency measurements with good repeatability.

  • Dew Point measurements using montmorillonite mtt and molybdenum disulfide mos2 coated qcm sensors
    Sensors and Actuators B-chemical, 2019
    Co-Authors: Ning Li, Zhongying Wang, Yichuan Wu, Mingjing Qi, Qiyang Huang, Xiaofeng Meng, Baoxia Mi
    Abstract:

    Abstract Due to the influence of temperature, the traditional quartz crystal microbalance (QCM) Dew Point sensors require an independent study on the temperature frequency characteristics (TFC) for calibrations as the frequency response is susceptible to external interferences. QCM Dew Point sensors with either montmorillonite (MTT) or molybdenum disulfide (MoS2) coatings together with a Dew Point recognition algorithm are demonstrated for Dew Point recognitions. The frequency signals output from three kinds of QCM sensors are processed by the proposed recognition algorithm and compared with the standard Dew Point data provided by MICHELL S4000. The results show QCM sensors with MTT coating have the best accuracy and repeatability test for 5 days in range of 3 ℃ DP–15 ℃ DP environment has shown the maximum relative error as compared with the standard Dew-Point values is less than ±0.3 ℃ DP. As such, this work shows the feasibility of utilizing QCM humidity sensors without the influence of temperature on frequency measurements with good repeatability.

Ryszard Jachowicz - One of the best experts on this subject based on the ideXlab platform.

  • novel Dew Point hygrometer fabricated with inkjet printing technology
    Sensors and Actuators A-physical, 2016
    Co-Authors: Grzegorz Tarapata, Rafał Selma, Michal Marzecki, Daniel Paczesny, Ryszard Jachowicz
    Abstract:

    Abstract This paper reports a novel, first time made Dew Point Hygrometer (DPH) detector, which was fully fabricated with the inkjet printing technology. This type of the sensor operation was already known in DPH which is based on a silicon complex Dew detector (Jachowicz and Senturia, 1981; Weremczuk et al., 2006) [1] , [2] . However, in our device the silicon substrate has been replaced by a thin, flexible Kapton foil. All components integrated in the detector: the interdigitated capacitive sensor electrodes, the thermoresistor and the heater were made by ink-jet printing technology. All individual elements of the printed Dew Point hygrometer detector have been characterized, and finally, their measurement features were described.

  • novel Dew Point hygrometer fabricated with inkjet printing technology
    Procedia Engineering, 2015
    Co-Authors: Grzegorz Tarapata, Rafał Selma, Michal Marzecki, Daniel Paczesny, Ryszard Jachowicz
    Abstract:

    Abstract This paper reports a novel, first time made Dew Point Hygrometer (DPH) detector, which was fully fabricated with the inkjet printing technology. This type of the sensor operation was already known in DPH which is based on a silicon complex Dew detector [1] . However, in our device the silicon substrate has been replaced by a thin, flexible Kapton foil. All components integrated in the detector: the interdigitated capacitive sensor electrodes, the thermoresistor and the heater were made by ink-jet printing technology. All individual elements of the printed Dew Point hygrometer detector have been characterized, and finally, their measurement features were described.

  • a mems based super fast Dew Point hygrometer construction and medical applications
    Measurement Science and Technology, 2009
    Co-Authors: Ryszard Jachowicz, Daniel Paczesny, Jerzy Weremczuk, Grzegorz Tarapata
    Abstract:

    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.

  • fast Dew Point hygrometer with silicon integrated detector optimization of dynamic properties
    Sensors and Actuators A-physical, 2006
    Co-Authors: Jerzy Weremczuk, Grzegorz Tarapata, Daniel Paczesny, Ryszard Jachowicz
    Abstract:

    Some biomedical applications require fast and accurate humidity measurements. These requirements can be met by Dew Point hygrometers with both special construction and special algorithm of temperature control for Dew detection. The hygrometer construction described in the paper is based on integrated semiconductor structure combining the impedance Dew detector, the thermoresistor and the heater. An adaptive type algorithms with number of Dew detections per minute, minimal temperature over-regulations and low power consumption as a criterions for optimization have been designed to control the detector temperature. Finally, experimental results of optimal heater and Peltier couple currents set up for fast Dew Point temperature measurements are discussed in the report.

  • transepidermal water loss sensor based on fast Dew Point hygrometer
    Sensors and Actuators A-physical, 2005
    Co-Authors: Ryszard Jachowicz, Jerzy Weremczuk, Grzegorz Tarapata
    Abstract:

    A new idea of moisture content in human skin measurement with use of fast Dew Point hygrometer sensor is presented in the report. The hygrometer construction based on integration in the single semiconductor sensor structure with the impedance detector, the thermoresistor and the heater is described in the paper. Both the experimental results of the Dew Point hygrometer tests as well as initial empirical results from the measurements of TransEpidermal Water Loss (TEWL) are shown.