How does the two-coloured pyrometer work?
Single-color pyrometer is composed of an infrared sensor and data processing circuitry, the measurement of the target requires the target to fill the field of view, pyrometer and the target between the smoke and water vapor can not be.
Two-color pyrometer is composed of two different bands of sensors and data processing circuits, the pyrometer on the smoke, water vapor has a certain degree of anti-interference ability.
Two-color pyrometer can only measure high-temperature objects, in the case of bad environment two-color pyrometer will not be interfered with.
Two-color pyrometer is relative to the single-color pyrometer, it is also a kind of infrared thermometer, its working principle is:
The ratio of the radiant energy of two different bands, and the temperature has a certain correspondence.
With two sets of narrow bandwidth monochrome filters, receiving two adjacent bands of radiant energy, converted into an electrical signal for comparison, with this ratio can determine the temperature of the measured object.
Two-color temperature measurement technology relative to single-color, its temperature measurement results are more stable and accurate.
As it is through two different bands of radiation energy ratio to determine the temperature, thus reducing the dependence on the value of the radiation energy, more adaptable to harsh measurement environments than single-color pyrometer.
For example, two-color infrared thermometers are more advantageous when the target is obscured, or when measuring smaller targets.
When the field of view and the target has some occlusion, in the process of infrared temperature measurement, the occlusion is mainly reflected in:
1: The measured target or aiming channel is somewhat obstructed;
2: Dust, smoke or water vapor between the infrared thermometer and the target to be measured;
3: Measurement through the area will reduce the infrared thermometer to the reception of radiant energy, such as grids, fences, small holes, etc.;
4: Increase the observation window when measuring, because the window surface has moisture or dust, changing the infrared transmission rate, thus affecting the measurement results;
5: Dust or moisture accumulation on the sensor lens.
In general, when the measured target is blocked, or the temperature measurement field of view has obstacles, the energy collected by the pyrometer will be reduced, but the ratio of radiant energy is not affected, and the measured results are still accurate.
When the target does not fill the pyrometer field of view, when measuring smaller targets, the target can not fill the field of view, or measuring the movement of the target, the radiant energy will also be reduced;
This has an effect on single-color infrared thermometers, but for two-color infrared thermometers, accurate results can be obtained as long as the background temperature is lower than the temperature of the target being measured.
When the target emissivity is low or changing, when the emissivity of the target to be measured is not known, or when the target emissivity is changing;
As long as the change in emissivity in both bands is caused by the same factors, measurement with a two-color pyrometer is more accurate than a single-color pyrometer.
It does not Whether it is a two-color pyrometer or a single-color pyrometer are characterized by high accuracy, high repeatability, high reliability and fast response;
Online pyrometer is widely used in non-ferrous smelting, powder metallurgy, medium and high frequency induction heating, casting, ceramics, welding and heat treatment and other industries and harsh environments online temperature detection, but also can be applied to scientific research, medical and other fields.
