What Are Infrared Photoresistors?

In the modern electronic components industry, infrared photoresistors serve as essential photonic sensors that are widely used in various automation devices and intelligent systems. With the advancement of technology and the growth of the Internet of Things (IoT), the demand for infrared photoresistors has been steadily increasing. This article will delve into the definition, working principle, characteristics and advantages, and applications of infrared photoresistors.

I. What are Infrared Photoresistors?

Infrared photoresistors are resistors that are sensitive to infrared light, and their resistance changes according to the intensity of the incoming infrared light. Unlike traditional photonic components, infrared photoresistors are primarily used to detect infrared light signals, playing a critical role in many applications.

II. Working Principle

The working principle of infrared photoresistors is based on the photoelectric effect. When infrared light strikes the sensitive material of the photoresistor, photons excite the electrons in the material, causing them to jump and reduce the resistance. Specifically, the stronger the intensity of the infrared light, the lower the resistance of the photoresistor. This characteristic allows infrared photoresistors to effectively detect and respond to changes in light intensity.

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