The working principle of humidity resistance and its usage and application (I)

Humidity resistance is made by using the principle that the moisture sensitive material absorbs moisture in the air and causes its own resistance value to change. Industrially popular moisture sensitive resistors mainly include lithium chloride moisture sensitive resistors and organic polymer membrane moisture sensitive resistors. The popular moisture sensitive resistors in the industry are:

1, semiconductor ceramic humidity sensor;

2, lithium chloride humidity resistance;

3, organic polymer film humidity resistance.

Humidity resistance is characterized by covering the substrate with a film made of a moisture sensing material. When the water vapor in the air adsorbs on the moisture sensing film, the resistance and the resistance of the element change, and this characteristic is utilized. Measure humidity. Humidity-sensitive capacitors are generally made of polymer film capacitors. Commonly used polymer materials include polystyrene, polyimide, and cellulose acetate. When the humidity of the environment changes, the dielectric constant of the humidity sensitive capacitor changes, and its capacitance also changes. The amount of capacitance change is proportional to the relative humidity.