PRODUCT
- STRONG Series 2-color infrared pyrometer
- STRONG Series 1-color infrared pyrometer
- BFS-STRONG Hot-Blast Stove/Furnace infrared temperature measurement system
- MARS Series 1-color infrared pyrometer
- SMART Series Optical Fiber 2-color infrared pyrometer
- SMART Series Optical Fiber 1-color infrared pyrometer
- TD800 Series Large Screen Temperature Display
- TD500 Series Large Screen Temperature Display
- TM-01 Infrared Pyrometer Software
- Principle of Infrared Pyrometer
- Testing Equipment
Principle of Infrared Pyrometer
Classification of Infrared Pyrometer
Infrared pyrometer determines the temperature of an object by detect the amount of infrared radiation energy emitted by the object. In theory, any object above absolute zero can emit infrared radiation energy. Infrared pyrometers can be classified into one-color pyrometers, two-color pyrometers and multi-color pyrometers according to the number of measured wavelength.
Principle of one color infrared pyrometer
Currently, the one color pyrometers on market are mostly narrow-band pyrometers. Its principle of temperature measurement is to determine the temperature by detecting the radiant energy that occurs in a narrow wavelength range of an object. The temperature a pyrometer measured is the average temperature in an area, and the measuring result is affected by emissivity, lens contamination and background radiation.
The amount of radiant energy emitted by an object has a certain relationship with the emissivity. The greater the emissivity, the greater the infrared energy emitted by the object. The emissivity of an object has a certain relationship with the state of the surface of the object. The surface roughness, brightness, and different materials will all affect the emissivity. Therefore, when using a monochromatic thermometer, there is often an emissivity table of different materials.
Different types of detector selected under different atmospheric window
|
Window 1 |
Si (silicon) |
|
Window 2 |
Ge (germanium) InGaAs (indium gallium arsenide) |
|
Window 3 |
PbS (lead sulfide) |
|
Window 4 |
PbSe (Lead Selenide) |
|
Window 5 |
Thermopile (Thermopile) |
|
Window 6 |
Principle of two-color infrared pyrometer
Correspondence curve between ratio of dual silicon detector and temperature (two-color characteristic curve of a certain detector)
250～3000℃ InGaAs detector characteristic curve, signal dynamic range 2.1 million times
The two-color pyrometer can eliminate the effects of water vapor, dust, detection target size change, partial obstruction, emissivity change, etc. As a result, the two-color pyrometer does not need to correct the two-color coefficient when measuring most gray body materials. The two-color pyrometer measures the average value of the highest temperature in an area.The hardware and software design is suitable for the processing of one million times of the signal, which can meet the user's demand for instrument accuracy, repeatability and so on.
The advantages of two-color thermometers compared with monochromatic thermometers
In two-color temperature measurement, temperature will not change with the object’s surface state (such different surface roughness or chemical state ), which will not affect the accuracy of temperature measurement, but will have an impact on one-color pyrometer measurement .
The optical part of pyrometer, such as glass, will accumulate some dust after using for a period. The presence of water, gas, oil, etc. in the air will reduce the emissivity coefficient, so the temperature measured by one color pyrometer will decrease. The two-color pyrometer measures the ratio of infrared radiation intensities of two band wavelength in a specific range. With dust, water vapor and other disturbances, the signals of two wavelength fall simultaneously and the ratio remains constant after division. But this does not mean two-color pyrometer does not require maintenance. User still need to wipe the glass when it is too dirty.
One-color pyrometer cannot measure objects smaller than the field of view. When the target cannot fill the field of view, the measurement temperature will be lower than actual temperature. The two-color pyrometer can measure objects smaller than the field of view.
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Email: sales@sjgdkj.com
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Copyright © 2020 Changzhou Sijie Optoelectronics Technology Co., Ltd All Right Reserved
苏ICP备16003842号-1