Infrared temperature sensors can detect electromagnetic waves in the range of 700 nm to 14,000 nm. Although the infrared spectrum can be extended to 1,000,000 nm, the measurement value of infrared temperature sensors does not exceed 14,000 nm. These sensors focus the infrared energy emitted by the object to one or more On a photodetector.
These photodetectors convert this energy into an electrical signal that is proportional to the infrared energy emitted by the object; because the infrared energy emission of any object is proportional to its temperature, the electrical signal provides an accurate reading of the temperature of the object to which it is directed . The infrared signal is transmitted to the sensor through a window made of special plastic. Although plastic generally does not allow infrared frequencies to pass through it, the sensor uses a way that is clear to specific frequencies. This plastic can filter out unwanted frequencies and protect the inside of the sensor Electronic components are protected from dust, dirt and other foreign objects.
Advantages of infrared temperature sensors
1. Infrared temperature sensor reads moving objects. Because touch temperature sensors do not work well on moving objects, infrared temperature sensors are very suitable for measuring the temperature of tires, brakes and similar equipment;
2. The infrared temperature sensor will not wear, and there will be no physical conflict without touching, so it has a longer service life;
3. The infrared temperature sensor can provide more details, and the IR sensor can provide more details than the touch device during measurement, just point it at different positions on the object being read;
4. The infrared temperature sensor can be used to detect motion by measuring the temperature shake in the field of view.
Each substance emits more infrared radiation at a particular frequency than others. For example, polyethylene emits most of the infrared radiation at 3,430nm, while metal emits mainly at 1,000nm. For best performance, the spectral scale of the infrared temperature sensor must be centered on these peak temperatures. Therefore, it is important to keep in mind specific applications that require infrared temperature sensors when ordering, or to order sensors with adjustable spectral scale.
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