What is a Infrared sensor?

An infrared sensor is a sensor that has an element that detects light in the infrared region. Infrared sensors have been widely researched, and there are many types of light receiving elements with various principles and materials. The principle is mainly divided into thermal type and quantum type, but it is further divided into 3 types for thermal type and about 5 types for quantum type. Infrared wavelengths are classified into near-infrared, mid-infrared, and far-infrared, and there are areas where sensors are good at.
Infrared sensors not only detect infrared rays, but also emit infrared rays by themselves, and by detecting the infrared rays after irradiating the object, there is also a type of product that confirms the distance to the object and the presence or absence of an object.

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