What are the main functions of photoresistors?

May 29, 2024

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1. The function of photoresistors

The function of a photoresistor is to utilize the sensitivity of materials to light, change the resistance value under illumination, convert light signals into electrical signals, and achieve functions such as control and measurement


2. Application fields of photoresistors

Photosensitive resistors are widely used in various situations that require detection and control of light intensity. Specific application areas include but are not limited to:

-Environmental light monitoring: such as automatic adjustment of indoor brightness, night light control, etc.

-Military equipment: such as night vision devices, navigation systems, etc.

-Medical equipment: such as heart rate monitors, phototherapy devices, etc.

-Smart home: such as smart curtains, automatic restrooms, etc.

-Industrial automation: such as automatic control robots, subway signal devices, etc.


3. Working principle of photoresistors

When photons are irradiated on the surface of a photosensitive resistor, they will be absorbed and excited by electrons in the photosensitive material, which will transition from the valence band to the conduction band. Due to the presence of localized electrons, this transition will result in a change in resistance value. Therefore, the greater the light intensity, the smaller the resistance value.