薄膜電容濕度傳感器工作原理：Water vapour penetrates the upper electrode and reaches the active polymer film. 水蒸汽穿過(guò)上部電極 , 到達(dá)活性聚合物薄膜。

How much water vapour is absorbed into the film depends on the ambient relative humidity. 多少水蒸汽被薄膜吸收取決于周圍環(huán)境的相對(duì)濕度。

Because the sensor is small and the polymer film thin , the sensor responds quickly to changes in ambient humidity. 因?yàn)閭?感器尺寸小和聚合物薄膜很薄，所以傳感器可以對(duì)周圍環(huán)境的濕度變化作出快速反應(yīng)。

The water vapor absorbed in the film changes the dielectric properties of the sensor: the capacitance of the sensor changes. 聚合物中吸收的水蒸汽 改變了傳感器的電介質(zhì)特性 ：傳感器的電容值改變。 The change in the sensor's capacitance is measured with measurement electronics . 傳感器電容的改變通過(guò)測(cè)量電路來(lái)測(cè)量。