Vaisala PTB210 SERIES Manuale delle Istruzioni Pagina 16

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The structure of the sensing element is demontrated in Fig. 2.4.
There is a thin gold layer, a hygroscopic polymer layer, a electrode system and a
ceramic substrate.
Figure 2.4: Sensing Element
[Physics of the Humidity Technology,
R. Freitag, PowerPoint Presentation, 4/07]
The Polymer is to be poised with the environment and store water, where the thin
goldlayer is water vapour permeable. By this means a storage of the H
2
O-dipol
causes a change of the dielectric within the capacitor which depends on frequency.
So capacity increases by availability of charge carriers which is detected within the
connected electronics for further converting processes.
16
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