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By Eva | 16 August 2023 | 0 Comments

Introduction to Infrared Sensing

Infrared sensing, also known as infrared detection or IR sensing, is a technology that involves detecting and measuring infrared radiation (IR) emitted by objects or surfaces. Infrared radiation is a type of electromagnetic radiation with longer wavelengths than visible light but shorter than microwaves. It is commonly used for various applications, including remote temperature measurement, motion detection, night vision, and communication.

Infrared sensors are devices that can detect and convert IR radiation into an electrical signal, which can then be processed and analyzed to extract information about the environment or objects being sensed. There are several types of infrared sensors, each designed for specific applications:

1.Thermal Infrared Sensors: These sensors detect the heat (thermal energy) emitted by objects. They are often used for temperature measurement, industrial process monitoring, and in some cases, for detecting living beings based on their body heat. Infrared cameras, commonly used in night vision applications, also fall under this category.


2.Passive Infrared (PIR) Sensors: PIR sensors detect changes in infrared radiation caused by motion. They are widely used in security systems, automatic lighting control, and energy-efficient HVAC systems. PIR sensors typically consist of multiple infrared detectors that are sensitive to changes in IR patterns.

3. Active Infrared Sensors: These sensors emit their own infrared radiation and measure the reflection or absorption of the emitted IR by objects in the sensor's field of view. This approach is used in proximity sensors, distance measurement devices (like LiDAR), and some communication systems.

4.Infrared Spectroscopy: This is a technique used to analyze the chemical composition of materials by studying how they interact with infrared light. Different molecules absorb infrared radiation at specific wavelengths, allowing researchers to identify the presence of certain compounds.

5.Infrared Communication: Infrared communication involves the use of infrared signals to transmit data between devices. This is often seen in remote controls for TVs and other electronics, as well as in some short-range wireless communication technologies.


Infrared sensing has applications in a wide range of industries, including aerospace, automotive, electronics, security, medicine, and more. It enables the detection of objects and phenomena that are not visible to the human eye, making it a valuable tool for various purposes. The development of more advanced and sensitive infrared sensors continues to expand the capabilities of this technology.

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