Infrared temperature sensor

Using infrared ray to measure the physical properties of the sensor. Infrared, also known as infrared light, it has the reflection, refraction, scattering, interference, such as absorption properties. Any matter, as long as it itself has a certain temperature (above absolute zero), infrared radiation. Infrared temperature sensor is not in direct contact with the object to be tested, so there is no friction, and has a high sensitivity, fast response, etc.

Including the optical system, infrared temperature sensor detecting element and conversion circuit. Optical system according to the different structures can be divided into two categories, transmission type and reflection type. Detecting element according to the principle of work can be divided into thermal detecting element and photoelectric detecting element. Is one of the most thermistor temperature sensor applications. Thermistor by infrared radiation temperature, resistance to change, this change may be larger may be smaller, because of the thermal resistor can be divided into positive temperature coefficient thermistor and negative temperature coefficient thermistor), through the conversion circuit into electrical signal output. Photoelectric detecting element in common use is photosensitive element, usually composed of lead sulfide, pbse, indium arsenide, arsenic and antimony, hgcdte ternary alloy, germanium and silicon doped materials.

The temperature sensor

General measure precision is higher. At a certain temperature range, the thermometer can measure the temperature distribution within the object. But for the movement of body or heat capacity is very small, small target object will produce larger error of measurement, the commonly used thermometer with double metal thermometer, glass thermometer, pressure type thermometer, resistance, thermal resistance and thermocouple thermometer. They are widely used in industry, agriculture, business, etc. People often use the thermometer in our daily life. With low temperature technology in national defense engineering, space technology, metallurgy, electronics, food, medicine, and the wide application of petrochemical sector and superconducting technology research, measuring temperature below 120 k of the development of low temperature thermometer, such as low temperature gas thermometer, vapor pressure thermometer, acoustics, paramagnetic salt thermometer thermometer, quantum, low temperature thermal resistance and low temperature thermocouple thermometer, etc. Low temperature thermometer for temperature sensing element is small in size, high accuracy, good reproducibility and stability. Using the porous of high silica glass carburization sintering carburizing glass heat resistance is a kind of low temperature thermometer temperature sensing element, can be used for measuring temperature range of 1.6 ~ 300 k.