What is the principle of a dual color thermometer?
A monochromatic thermometer is composed of an infrared band sensor and a data processing circuit. When measuring the target, it is required that the target object is filled with a full 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 different wavelength sensors and data processing circuits. 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 single color thermometer. Its working principle is:
The ratio of radiation energy from 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 monochromatic temperature measurement, dual color temperature measurement technology has more stable and accurate temperature measurement results.
Due to its determination of temperature through the ratio of radiation energy in two different bands, it reduces dependence on radiation energy values and is more adaptable to harsh measurement environments than monochromatic thermometers.
For example, when the target is obstructed or when measuring smaller targets, a dual color infrared thermometer has more advantages.
When there is some obstruction between the field of view and the target, the obstruction is mainly reflected in the process of infrared temperature measurement:
1: The tested target or aiming channel is somewhat obstructed;
There is dust, smoke, or water vapor between the infrared thermometer and the measured target;
3: The area passed during measurement will reduce the infrared thermometer's reception of radiation energy, such as grids, fences, small holes, etc;
Increase the observation window during measurement, as there is moisture or dust on the surface of the window, which changes the infrared transmittance and affects the measurement results;
5: Dust or moisture accumulation on the sensor lens.
Generally speaking, when the measured target is obstructed or there are obstacles in the temperature measurement field, the energy collected by the thermometer will decrease, but the ratio of radiation energy is not affected, and the measurement results are still accurate.
When the target is not filled with the field of view of the thermometer, when measuring smaller targets but the target cannot fill the field of view, or when measuring moving targets, the radiation energy will also decrease;
It has a certain impact on monochromatic 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.
