Chilled-Mirror Hygrometer or Mirror-Based Dew-Point Sensors

Authored by: Ghenadii Korotcenkov

Handbook of Humidity Measurement

Print publication date:  February  2019
Online publication date:  January  2019

Print ISBN: 9781138300224
eBook ISBN: 9780203731888
Adobe ISBN:


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Mirror-based dew-point sensors are based on the condensation method. It is known that every object in a moist atmosphere has water molecules on its surface. The concentration on these molecules is related to the temperature of the object and to the dew point of the atmosphere. If the temperature of the surface is above the dew point of the atmosphere, the thin layer of the water molecules will be invisible. However, as the surface is cooled to the dew point, the density of water molecules at the surface becomes so great that the water condenses on the surface, and the dew can be seen. Mirror-based dew-point sensors have better accuracy then the methods described above, but these devices are costlier in fabrication and exploitation, because they require maintenance by qualified personnel. This chapter reviews these devices, including surface conductive dew-point hygrometers. The design features of dew-point hygrometers; the history of their appearance; the scope; their performances, including the accuracy of the measurement; and their advantages and disadvantages are also examined and analyzed.

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