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The infrared sensors are the sensors that detect/measure infrared radiation or change in the radiation from outer source source or inbuilt source.Also sensors that uses the property of infrared radiations to detect the changes in surrounding are termed as infrared sensors.

There are two types of infrared sensor based on its function:

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The A general working method of most infrared sensor sensors is as follows.:

Detection System

The detector performance is based on to following parameters:

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Types of Infra-Red Sensors

-There are two types of infrared sensor based on its function:

• Thermal Infrared sensor:
• Quantum infrared sensor

-These are the types of infrared sensors based on the working mechanism:

• Active Infrared Sensors
• Passive Infrared sensors

ACTIVE INFRARED SENSORS

Active infrared sensors are the types of infrared sensor that emit infrared radiation which is later received by the receiver. The IR is emitted by a IR Light Emitting Diode (LED) and received by photodiode, phototransistor or photoelectric cells. During the process of detection, the radiation is altered, between process of emission and receiving, by object of interest. The alteration of radiation causes change in received radiation in the receiver. This property is used to generate desired output with help of associated electronic circuit.

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