About Infrared Sensor

Infrared sensors are the most commonly used sensors in wireless technology and are divided into active and passive types. Infrared focal plane detector is also a kind of passive infrared sensor, which can realize infrared thermal imaging and infrared temperature measurement. This involves remote control functionality and detection of surrounding objects/obstacles.

What is an infrared sensor?

An IR sensor is a simple electronic device that emits and detects IR radiation to find certain objects/obstacles within its range. Some of its features are heat and motion sensing.

IR sensors use infrared radiation with wavelengths between 0.75 and 1000µm, which is between the visible and microwave regions of the electromagnetic spectrum. The IR region is invisible to the human eye. The infrared spectrum is divided into three regions according to its wavelength, namely near-infrared, mid-infrared, and far-infrared.

Wavelength region of infrared spectrum

· Near infrared – 0.75µm to 3 µm
· Mid-IR – 3 µm to 6 µm
· Far IR – > 6 µm

Types of Infrared Sensors

IR sensors can be divided into two types based on the presence of IR sources:
· Active infrared sensor
· Passive infrared sensor

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