Development of a low frost-point generator operating at sub-atmospheric pressure

Cuccaro, R.; Rosso, L.; Smorgon, D.; Beltramino, G.; Tabandeh, Shahin; Fernicola, Vito

doi:10.1088/1361-6501/aaa785

Cited by 11 publications

(20 citation statements)

References 30 publications

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“…Reference facilities have been developed through the project for calibrating the meteorological observation instruments to be used in the meteorological community. Additionally, lowtemperature and low-pressure humidity chambers have been developed for calibrating radiosonde humidity sensors in the environments imitating the upper troposphere/lower stratosphere (Sairanen et al, 2015;Cuccaro et al, 2018). To investigate the climate change, a certain level of measurement uncertainty in radiosoundings should be secured in a SItraceable way.…”

Section: Introductionmentioning

confidence: 99%

Laboratory characterisation and intercomparison sounding test of dual thermistor radiosondes for radiation correction

et al. 2022

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Abstract. A dual thermistor radiosonde (DTR) comprising two (aluminium-coated and black) sensors with different emissivities was developed to correct the effects of solar radiation on temperature probes based on in situ radiation measurements. Herein, the DTR performance is characterised in terms of the uncertainty via a series of ground-based facilities and an intercomparison radiosounding test. The DTR characterisation procedure using laboratory facilities is as follows: individually calibrate the temperature of the thermistors in a climate chamber from −70 to 30 ∘C to evaluate the uncertainty of raw temperature measurement before radiation correction; test the effect of temperature on the resistance reading using radiosonde boards in the climate chamber from −70 to 20 ∘C to identify a potential source of errors owing to the boards, especially at cold temperatures; individually perform radiation tests on thermistors at room temperature to investigate the degree of heating of aluminium-coated and black sensors (the average ratio = 1 : 2.4) and use the result for obtaining unit-specific radiation correction formulas; and perform parameterisation of the radiation measurement and correction formulas with five representative pairs of sensors in terms of temperature, pressure, ventilation speed, and irradiance using an upper air simulator. These results are combined and applied to the DTR sounding test conducted in July 2021. Thereafter, the effective irradiance is measured using the temperature difference between the aluminium-coated and black sensors of the DTR. The measured irradiance is then used for the radiation correction of the DTR aluminium-coated sensor. The radiation-corrected temperature of the DTR is mostly consistent with that of a commercial radiosonde (Vaisala, RS41) within the expanded uncertainty (∼ 0.35 ∘C) of the DTR at the coverage factor k = 2. Furthermore, the components contributing to the uncertainty of the radiation measurement and correction are analysed. The DTR methodology can improve the accuracy of temperature measurement in the upper air within the framework of the traceability to the International System of Units.

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Section: Introductionmentioning

confidence: 99%

Laboratory characterisation and intercomparison sounding test of dual thermistor radiosondes for radiation correction

et al. 2022

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“…The slow response of humidity sensors, especially at low temperatures, induces a time lag in the measurement (Miloshevich et al, 2004). To evaluate the calibration uncertainty, several groups have reported the development of low‐temperature low‐pressure humidity chambers, including KRISS (Lee et al, 2019a), the Istituto Nazionale di Ricerca Metrologica (INRiM) in Italy (Cuccaro et al, 2018), and the VTT in Finland (Sairanen et al, 2014, 2015). According to the GRUAN, the required accuracy of the water vapour measurement in the upper air is 2% in terms of the mixing ratio (GCOS, 2007).…”

Section: Introductionmentioning

confidence: 99%

Calibration of RS41 humidity sensors by using an upper‐air simulator

Lee

Kim

Choi

et al. 2021

Meteorological Applications

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The upper-air simulator (UAS) was developed at the Korea Research Institute of Standards and Science to test commercial radiosonde sensors under representative conditions. In this framework, humidity generation is performed through a two-temperature mode in which the temperatures of the saturator and the test chamber are controlled independently. The operation range of the UAS in terms of the temperature, dew/frost-point temperature, and relative humidity (RH) is À70 to +20 C, À80 to +20 C, and 5%-100%, respectively.

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“…Reference facilities have been developed through the project for calibrating the meteorological observation instruments to be used in the meteorological community, such as the Global Climate Observing System (GCOS). Additionally, low-temperature and low-pressure humidity chambers have been developed for calibrating radiosonde humidity sensors when the project deliverables were limited to the field of upper air measurement by radiosondes (Sairanen et al, 2015;Cuccaro et al, 2018). To resolve the long-term climate change, a certain amount of measurement 40 uncertainty of radiosonde sensors is required for actual soundings in addition to the ground-based facilities.…”

Section: Introduction 25mentioning

confidence: 99%

Laboratory characterisations and intercomparison sounding test of dual thermistor radiosondes for radiation correction

Lee

Kim

Lee

et al. 2021

Preprint

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Abstract. A dual thermistor radiosonde (DTR) comprising two (white and black) sensors with different emissivities was developed to correct the effects of solar radiation on temperature sensors based on in-situ radiation measurements. Herein, the DTR performance is characterised in terms of the uncertainty via a series of ground-based facilities and an intercomparison sounding test. The DTR characterisation procedure using laboratory facilities is as follows: individually calibrate the temperature of the thermistors in a climate chamber; test the effect of temperature on the resistance reading using radiosonde boards in the climate chamber; individually perform radiation tests on thermistors; and perform parameterisation of the radiation measurement and correction formulas using an upper air simulator with varying temperature, pressure and ventilation speed. These results are combined and applied to the DTR sounding test conducted in July, 2021. Thereafter, the effective irradiance is measured using the temperature difference between the white and black sensors of the DTR. The measured irradiance is then used for the radiation correction of the DTR white sensor. The radiation-corrected temperature of the DTR is mostly consistent with that of a commercial radiosonde (Vaisala, RS41) within the expanded uncertainty (~0.35 ℃) of the DTR at the coverage factor k = 2. Furthermore, the components contributing to the uncertainty of the radiation measurement and correction are analysed. The DTR methodology can improve the accuracy of temperature measurement in the upper air within the framework of the traceability to the International System of Units.

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Development of a low frost-point generator operating at sub-atmospheric pressure

Cited by 11 publications

References 30 publications

Laboratory characterisation and intercomparison sounding test of dual thermistor radiosondes for radiation correction

Laboratory characterisation and intercomparison sounding test of dual thermistor radiosondes for radiation correction

Calibration of RS41 humidity sensors by using an upper‐air simulator

Laboratory characterisations and intercomparison sounding test of dual thermistor radiosondes for radiation correction

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