Humidity sensors are sensors that convert the moisture content in air, gases, bulk materials or soil into an electric output signal. It is a humidity sensor device which is also known as hygrometer measures and regularly updates the relative humidity in air. It measures both air temperature and air moisture. Humidity sensor is composed of two metal plates with a non-conductive polymer film between them. The film collects moisture from the air which causes minute changes in the voltage between the two plates. Humidity sensors are generally used in textile machines, woodworking machines, printing and paper machines for measuring humidity in air.
Some of the major advantages of humidity sensors over conventional sensors low power requirement, easy implementation and betterment of transducer performance such as sensing elements, structure design, principle of mechanism, and fabrication technologies. Major disadvantages of humidity sensor market are high cost, frequent mirror contamination and insatiability under continuous use.
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