Explain the two-colour infrared thermometer principle and operation
Two-color infrared thermometer is a type of infrared thermometer. That is to measure the infrared radiation brightness emitted by an object in two different spectral ranges and infer the temperature of the object from the ratio of the two radiation brightness, which is called a two-color thermometer. In fact, the two-color thermometer does not have the meaning of brightness and color. Compared with the brightness thermometer (optical pyrometer), the two are different in principle. The meaning of "color" here should be infrared wavelength or spectrum, which is a "double infrared spectrum thermometer".
Two-color infrared thermometers have advantages over single-color infrared thermometers. A small metal shell is filled with many optical, optoelectronic and microelectronic devices to form a non-contact infrared thermometer with single-color and dual-color temperature measurement functions.
Two-color infrared thermometer principle
The two-color thermometer works based on the following principle: under two selected infrared wavelengths and a certain bandwidth, the ratio of their radiant energy changes with the change of temperature. Using two sets of different monochromatic filters with very narrow bandwidths, the radiation energy in two similar bands is collected, converted into electrical signals and then compared. Finally, the temperature of the measured target is determined from the ratio, so it can Basically eliminates the inconvenience of adjusting the emissivity of the target material. The two-color thermometer has higher temperature measurement sensitivity, smaller deviation from the true temperature of the target, and is less affected by the test distance and absorbers in between. It can be used in the medium and high temperature range. The effect is relatively good.
Features and performance of two-color thermometer
The two-color thermometer works based on the following principle: under two selected infrared wavelengths and a certain bandwidth, the ratio of their radiant energy changes with the change of temperature. Using two sets of different monochromatic filters with very narrow bandwidths, the radiation energy in two similar bands is collected, converted into electrical signals and then compared. Finally, the temperature of the measured target is determined from the ratio, so it can basically Eliminate the inconvenience of adjusting the emissivity of the target material. The use of a two-color thermometer has higher temperature measurement sensitivity, smaller deviation from the true temperature of the target, and is less affected by the test distance and absorbers in between. It is effective in the medium and high temperature range. Better.
