Expounding the Principle and Performance of Dual‑Color Infrared Thermometers
Dual color infrared thermometer is a type of infrared thermometer. The dual color thermometer measures the infrared radiance emitted by an object in two different spectral ranges and infers the temperature of the object based on the ratio of these two radiance luminosities. In fact, the dual color thermometer does not have the meaning of brightness and color, and 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 "dual infrared spectrum thermometer".
Compared with monochrome infrared thermometers, dual color infrared thermometers have * * * advantages. A non-contact infrared thermometer with monochrome and dual color temperature measurement functions is composed of many optical, optoelectronic, and microelectronic devices filled in a small metal shell.
Principle of dual color infrared thermometer
The dual color thermometer works based on the following principle: the ratio of their radiated energy varies with temperature at two selected infrared wavelengths and a certain bandwidth. By using two sets of narrow bandwidth monochromatic filters, the radiation energy in two similar frequency bands is collected, converted into electrical signals, and then compared. Finally, the temperature of the measured target is determined based on this ratio. Therefore, it can basically eliminate the inconvenience of adjusting the emissivity of the target material. The use of a two-color thermometer has high temperature sensitivity, small deviation from the true temperature of the target, and is less affected by the test distance and the absorption of substances between them. It has good performance in the medium and high temperature range.
Characteristics and performance of dual color thermometer
The dual color thermometer works based on the following principle: the ratio of their radiated energy varies with temperature at two selected infrared wavelengths and a certain bandwidth. By using two sets of narrow bandwidth monochromatic filters, the radiation energy in two similar frequency bands is collected, converted into electrical signals, and then compared. Finally, the temperature of the measured target is determined based on this ratio. Therefore, it can basically eliminate the inconvenience of adjusting the emissivity of the target material. The use of a two-color thermometer has high temperature sensitivity, small deviation from the true temperature of the target, and is less affected by the test distance and the absorption of substances between them. It has good performance in the medium and high temperature range.
