Design and validation of a new primary standard for calibration of the top-end humidity sensors

Hudoklin, Domen; Bojkovski, Jovan; Nielsen, Jan Alexis; Drnovšek, J.

doi:10.1016/j.measurement.2008.01.006

Cited by 18 publications

(11 citation statements)

References 7 publications

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“…Assuming a uniform distribution, the standard uncertainty of this estimation is u e s (T dp,c , P c ) = 1.05 Pa/ √ 3 = 0.61 Pa. The dew-point measurements are traceable to a primary dew-point generator [17,18] with standard uncertainty of 0.03 • C in the range from −50 • C to +20 • C. Together with the measured instability of 0.02 • C, the combined standard uncertainty of the dew point was 0.036 • C. This uncertainty is propagated through equations for water-vapor pressure according to [19], which results in a standard uncertainty of the partial pressure on the dry side, u e s (T dp,s , P s ) = 0.35 Pa. Consequently, the standard uncertainty of the partial pressure difference u e s (T dp,s , P s ) − e s (T dp,c , P c ) = 0.70 Pa, which for instance at a partial pressure difference of 66.3 Pa corresponds to relative standard uncertainty of w e =1.05 %.…”

Section: Measurement Results and Uncertainty Evaluationmentioning

confidence: 99%

Uncertainty Evaluation of the New Setup for Measurement of Water-Vapor Permeation Rate by a Dew-Point Sensor

2012

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The measurement of the water-vapor permeation rate (WVPR) through materials is very important in many industrial applications such as the development of new fabrics and construction materials, in the semiconductor industry, packaging, vacuum techniques, etc. The demand for this kind of measurement grows considerably and thus many different methods for measuring the WVPR are developed and standardized within numerous national and international standards. However, comparison of existing methods shows a low level of mutual agreement. The objective of this paper is to demonstrate the necessary uncertainty evaluation for WVPR measurements, so as to provide a basis for development of a corresponding reference measurement standard. This paper presents a specially developed measurement setup, which employs a precision dew-point sensor for WVPR measurements on specimens of different shapes. The paper also presents a physical model, which tries to account for both dynamic and quasi-static methods, the common types of WVPR measurements referred to in standards and scientific publications. An uncertainty evaluation carried out according to the ISO/IEC guide to the expression of uncertainty in measurement (GUM) shows the relative expanded (k = 2) uncertainty to be 3.0 % for WVPR of 6.71 mg · h −1 (corresponding to permeance of 30.4 mg · m −2 · day −1 · hPa −1 ).

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Section: Measurement Results and Uncertainty Evaluationmentioning

confidence: 99%

Uncertainty Evaluation of the New Setup for Measurement of Water-Vapor Permeation Rate by a Dew-Point Sensor

2012

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“…An example of a BB is presented in Annex C of the standard EN 12470-5. Such a transfer BB related to this standard, designed for the calibration of ear thermometers and immersed in a stirred water bath with a similar mixing principle as in [7,8], was provided for the comparison by the pilot laboratory (Fig. 2).…”

Section: Equipmentmentioning

confidence: 99%

Comparison of Blackbodies for Calibration of Infrared Ear Thermometers

Pušnik

Clausen

Favreau³

et al. 2011

Int J Thermophys

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The article presents the results of the EURAMET Project No. 927 "Comparison of blackbodies for calibration of infrared ear thermometers (IRETs)". The objective of the comparison was to determine the agreement of blackbodies used for 123 128 Int J Thermophys (2011) 32:127-138 the calibration of IRETs among European national laboratories. To verify the accuracy of an IRET, a suitable blackbody (BB) is needed. Such a blackbody related to the EN standard, designed for the calibration of ear thermometers and immersed in a stirred water bath, was provided for the comparison by the pilot laboratory. The pilot provided also the transfer IRET and organized the comparison.

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“…This type of humidity sensor commonly uses a polyimide material to prepare a humidity sensitive layer due to its good sensing performance [15,16]. Its humidity sensing principle is as follows: water vapor can affect the dielectric constant value, and the capacitor value of the sensor is proportional to the relative humidity [17–20], however, due to its sensitive film material has poor performance under low temperature conditions, and hence most capacitive humidity sensors have poor linearity. The humidity value needs to be processed when the temperature is below −20 °C.…”

Section: Introductionmentioning

confidence: 99%

A Radiosonde Using a Humidity Sensor Array with a Platinum Resistance Heater and Multi-Sensor Data Fusion

Shi

Luo

Zhao

et al. 2013

Sensors

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This paper describes the design and implementation of a radiosonde which can measure the meteorological temperature, humidity, pressure, and other atmospheric data. The system is composed of a CPU, microwave module, temperature sensor, pressure sensor and humidity sensor array. In order to effectively solve the humidity sensor condensation problem due to the low temperatures in the high altitude environment, a capacitive humidity sensor including four humidity sensors to collect meteorological humidity and a platinum resistance heater was developed using micro-electro-mechanical-system (MEMS) technology. A platinum resistance wire with 99.999% purity and 0.023 mm in diameter was used to obtain the meteorological temperature. A multi-sensor data fusion technique was applied to process the atmospheric data. Static and dynamic experimental results show that the designed humidity sensor with platinum resistance heater can effectively tackle the sensor condensation problem, shorten response times and enhance sensitivity. The humidity sensor array can improve measurement accuracy and obtain a reliable initial meteorological humidity data, while the multi-sensor data fusion technique eliminates the uncertainty in the measurement. The radiosonde can accurately reflect the meteorological changes.

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Design and validation of a new primary standard for calibration of the top-end humidity sensors

Cited by 18 publications

References 7 publications

Uncertainty Evaluation of the New Setup for Measurement of Water-Vapor Permeation Rate by a Dew-Point Sensor

Uncertainty Evaluation of the New Setup for Measurement of Water-Vapor Permeation Rate by a Dew-Point Sensor

Comparison of Blackbodies for Calibration of Infrared Ear Thermometers

A Radiosonde Using a Humidity Sensor Array with a Platinum Resistance Heater and Multi-Sensor Data Fusion

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