Atmospheric humidity is an important index of water vapor content,which plays a key role in both surface and upper air meteorological observation.Current techniques for measuring humidity include weight hygrometry,cavity ring-down spectroscopy(CRDS),thermodynamic method,tunable semiconductor laser absorption spectroscopy(TDLAS)and dew point method.The operation of weighing hygrometric method is complicated and time-consuming,which is mainly applied to national measurement standards and is not suitable for daily measurement.CRDS technology combined with high reflector can extend the optical path,high sensitivity,but the stability of the optical path is required,and it is easy to cause large errors when the field measurement is carried out in harsh environment.TDLAS scans the absorption spectrum of gas molecules and obtains information such as gas concentration and temperature through calculation.Dew point method is a simple and accurate method of humidity measurement,which is widely used and has attracted much attention in the academic circles.
humidity measurementsensordew point methodgravimetric method
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