What is the principle of double color thermometer?
A monochrome thermometer is composed of an infrared band sensor and a data processing circuit. When measuring a target, it is required that the target object fill the field of view, and there should be no smoke or water vapor between the thermometer and the target.
The dual color thermometer is composed of two sensors with different frequency bands and a data processing circuit. The thermometer has a certain anti-interference ability against smoke and water vapor.
The dual color thermometer can only measure high-temperature objects and will not be disturbed in poor environmental conditions.
A dual color thermometer is a type of infrared thermometer that is relatively different from a monochrome thermometer. Its working principle is:
The ratio of radiated energy between two different bands has a certain correspondence with temperature.
Two sets of narrow bandwidth monochromatic filters are used to receive radiation energy from two adjacent bands, convert it into electrical signals, and compare them. This ratio can be used to determine the temperature of the measured object.
Compared to monochrome temperature measurement technology, dual color temperature measurement results are more stable and accurate.
Due to its determination of temperature through the ratio of radiated energy from two different bands, it reduces dependence on radiated energy values and is more adaptable to harsh measurement environments than monochromatic thermometers.
It has a certain impact on monochrome infrared thermometers, but for dual color infrared thermometers, as long as the background temperature is lower than the measured target temperature, accurate measurement results can be obtained.
When the target emissivity is low or changes, when the measured target emissivity is unknown, or when the target emissivity changes,;
As long as the emissivity changes within two bands are caused by the same factors, using a dual color thermometer for measurement is more accurate than using a single color thermometer.
Both dual color thermometers and monochrome thermometers have the characteristics of high precision, high repeatability, high reliability, and fast response;
Online thermometers are widely used in various industries and harsh environments such as non-ferrous metallurgy, powder metallurgy, medium and high frequency induction heating, casting, ceramics, welding, and heat treatment for online temperature detection. They can also be applied in other fields such as scientific research and medical treatment.,
