College Physics >

2018 , Vol. 37 >Issue 6: 66 - 69

DOI: https://doi.org/10.16854 /j.cnki.1000-0712.170443

Measuring the relative humidity of the air by small changes in capacitance

  • WANG Yan-zhao ,
  • ZHOU Yu ,
  • LIU Guo-dong ,
  • XIA Yu-qing ,
  • ZHANG Ya-nan
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  • School of Physics and Optoelectronics Engineering，Nanjing University of Information Science and Technology，Nanjing，Jiangsu 210044，China

Received date: 2016-07-08

  Revised date: 2016-11-06

  Online published: 2018-06-20

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Abstract

The change of air relative humidity will cause the small change of the induced capacitance of the environment.For high quality factor resonant circuit，in its resonant state，the capacitance of small changes will lead to significant changes in signal amplitude. Using these characteristics，a measuring device is designed to obtain the relative humidity of air according to the change of signal amplitude. The device has simple structure，high precision，rapid reaction，can be used in teaching and demonstration and has high commercial promotion value.

Key words： air relative humidity; micro capacitance measurement; resonant circuit

Cite this article

WANG Yan-zhao , ZHOU Yu , LIU Guo-dong , XIA Yu-qing , ZHANG Ya-nan . Measuring the relative humidity of the air by small changes in capacitance[J]. College Physics, 2018 , 37(6) : 66 -69 . DOI: 10.16854 /j.cnki.1000-0712.170443

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