Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Development of a divided-flow humidity generator and its use for studying low-temperature effects on radiosonde humidity sensors

분류식 습도 발생 장치 개발 및 라디오존데 습도센서 저온 효과 보정에 활용 연구

  • Jang, Eun-Jeong (Division of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Lee, Young-Suk (Division of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Choi, Byung-Il (Division of Physical Metrology, Korea Research Institute of Standards and Science) ;
  • Choi, Yoonseuk (Department of Electronic Engineering, Hanbat National Unversity) ;
  • Lee, Sang-Wook (Division of Physical Metrology, Korea Research Institute of Standards and Science)
  • 장은정 (한국표준과학연구원 물리표준본부) ;
  • 이영석 (한국표준과학연구원 물리표준본부) ;
  • 최병일 (한국표준과학연구원 물리표준본부) ;
  • 최윤석 (한밭대학교 전자공학과) ;
  • 이상욱 (한국표준과학연구원 물리표준본부)
  • Received : 2021.06.14
  • Accepted : 2021.07.14
  • Published : 2021.07.31
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Abstract

Humidity is an important physical quantity that is closely related with the quality of everyday life as well as the quality control of products in various industries. Here, we have developed a divided-flow type humidity generator of which humidity generation is faster than the saturator-based humidity generator in ppm level. The operation principle of the divided-flow humidity generator is first introduced. Then, the performance of the divided-flow humidity generator is verified by testing the radiosonde humidity sensor at low temperature. As a result, the humidity generated from the divided-flow humidity generator is consistent with the saturator-based precision humidity generator within 1.6% relative humidity in the range from 10% to 40% at -45 ℃. It is also found that the radiosonde humidity sensor shows measurement errors by 3% - 5% at -45 ℃ when it is only calibrated at room temperature. The response times of radiosonde humidity sensor using the divided-flow humidity generator are between about 2 and 9 minutes, whereas those by the saturator-based humidity generator are about 20 minutes. In this regard, the divided-flow humidity generator has a merit in terms of fast humidity changes for the calibration of radiosonde humidity sensors at low-temperatures.

Keywords

Acknowledgement

이 연구는 한국표준과학연구원의 기관고유사업인 연직기상 온습도 정밀측정기술 개발(GP2021-0005-02)의 지원을 받아 수행되었다.

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