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In spectral studies of water vapor under laboratory conditions (determinationof molecular constants, measurement for spectral transmission functions), theamount of water vapor in the time of the measurements is one of the mostessential parameters, which should be determined accurately. We discuss theapplication for this purpose of polymer sensors of humidity manufactured byPraktik-NC (Moscow) and used in the Pulkovo VKM-100 multipass vacuum cell.These sensors were examined in the laboratory of Lindenberg Meteorologicalobservatory (Germany) by comparison between their readings and those ofstandard measuring devices for various values of relative humidity, pressure,and temperature. We also carried out measurements of relative humidity in boxeswith saline solution, in which the relative humidity that corresponds to agiven solution is guaranteed with the accuracy of several tenths of percent.The analysis of the results of the laboratory examination of the sensors andextended sets of measurements made with the Pulkovo cell made it possible toconclude that in measurements in the interval of relative humidity 40-80%, the~5% accuracy of the measurements for the water vapor content is reached.Further paths are indicated for the increase of the accuracy of measurementsand extending the interval of the relative humidity, in which accuratemeasurements may be carried out.

The Determination of the Water Vapor Content in the Pulkovo VKM-100 Multipass Vacuum Cell Using Polymer Sensors of Humidity