Determination of humidity based on registration of zero temperature coefficient of delay of surface acoustic waves

About the authors:

Ivan G. Simakov, Senior Researcher, Institute of Physical Materials Science, Siberian Branch of Russian Academy of Science, Cand. Phys. and Math. Sci.
Ch.Zh. Gulgenov, Researcher, Cand. Tech. Sci., Institute of Physical Materials Science of Siberian Branch of Russian Academy of Science

Abstract:

There has been developed an innovative measuring cell that allows to set the required vapour pressure in the adsorption zone, to control the supporter temperature and carry out acoustic measurements. A sensitive method to register small velocity changes and amplitude of surface acoustic waves has been described. The effect of a wet gas environment on the delay of surface acoustic waves in the “Lithium niobate — adsorbed water” system has been experimentally studied. It is shown that in a wet gas environment the temperature coefficient of delay (TCD) of surface acoustic waves in the «lithium niobate — adsorbed water» system has a zero value at a certain temperature. In the system under study there is a correlation between zero temperature of the TCD and a dew point. A suggestion was made to use the dependence of zero temperature of TCD on the vapor pressure to determine the relative humidity. The advantages of this method are considered.

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