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Mixing Ratio or Humidity Ratio: Mixing Ratio is the ratio of mass of the water vapor to mass of the dry air. Dew Point Temperature: Dew Point Temperature is the temperature at with the water vapor content is saturated in the air. In other words, for the air to hold maximum amount of water vapor or moisture , it has to reach Dew Point Temperature.

Humidity Sensors are very important devices that help in measuring the environmental humidity. Technically, the device used to measure the humidity of the atmosphere is called Hygrometer. Humidity Sensors or Hygrometers can be classified based on the type of humidity it is used for measuring i. Humidity Sensors can also be classified based on the parameter used for measuring Humidity i.

Let us see about different types of Humidity Sensors or Hygrometers along with their working principles. Humidity Sensors based on capacitive effect or simply Capacitive Humidity Sensors are one of the basic types of Humidity Sensors available. They are often used in applications where factors like cost, rigidity and size are s of concern.

In Capacitive Relative Humidity RH Sensors, the electrical permittivity of the dielectric material changes with change in humidity. A simple Capacitive RH Sensor can be made from an air filled capacitor as the moisture in the atmosphere changes its permittivity. But for practical applications, air as a dielectric is not feasible.

Hence, the space between the capacitor plates is usually filled with an appropriate dielectric material isolator , whose dielectric constant varies when it is subjected to change in humidity. The common method of constructing a capacitive RH sensor is to use a hygroscopic polymer film as dielectric and depositing two layers of electrodes on the either side.

Another way to use the capacitive RH sensors is to observe the changes in the frequency of the oscillator constructed using a capacitor with RH sensitive test subject as dielectric. This setup is often employed in pharmaceutical products. The test samples like medical tablets are placed between two plates which form the capacitor electrodes to form a capacitor in the LC Oscillator circuit.

The frequency of the oscillator changes with humidity surrounding the test sample. Let us see the construction of a thin thermostat polymer film based capacitive RH Sensor. It is fabricated on a silicon substrate. On this substrate, two metal electrodes made of either aluminium, platinum or chromium are deposited.

The shape of these electrodes is carved out such that, the electrodes form an interdigitized pattern. On top of this layer, a dielectric layer is deposited. The following image shows a top and cross section view of the capacitive humidity sensor.

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