Explain the principle and performance of the two-color thermometer
Two-color infrared thermometer is a kind of infrared thermometer. That is to measure the infrared radiance emitted by an object in two different spectral ranges and infer the temperature of the object from the ratio of the two radiances, 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, that is, "dual 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, forming a non-contact infrared thermometer with single-color and two-color temperature measurement functions.
Two-color infrared thermometer principle
The two-color thermometer works on the basis of the following principle: under the selected two infrared wavelengths and a certain bandwidth, the ratio of their radiant energy changes with the change of temperature. Two sets of different monochromatic filters with very narrow bandwidths are used to collect the radiant energy in two similar bands, convert them into electrical signals and then compare them, and finally determine the temperature of the measured target from the ratio, so it can basically Eliminate the inconvenience of adjusting the emissivity of the target material, the temperature measurement sensitivity of the two-color thermometer is high, the deviation from the real temperature of the target is small, and it is less affected by the test distance and the absorption in between. Better.
Features and performance of the two-color thermometer
The two-color thermometer works on the basis of the following principle: under the selected two infrared wavelengths and a certain bandwidth, the ratio of their radiant energy changes with the change of temperature. Two sets of different monochromatic filters with very narrow bandwidths are used to collect the radiant energy in two similar bands, convert them into electrical signals and then compare them, and finally determine the temperature of the measured target from the ratio, so it can Basically eliminate the inconvenience of adjusting the emissivity of the target material. The temperature measurement sensitivity of the two-color thermometer is high, the deviation from the real temperature of the target is small, and it is less affected by the test distance and the absorption in between. The effect is better.
