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For the infrared era dual-color pyrometer, the temperature is determined by the ratio of the radiant energy in two separate wavelength bands. Therefore, when the target to be measured is small and there is no full scene, smoke and dust on the measurement path and the attenuation of the radiation energy will not affect the measurement result. Even in the case of 95% energy reduction, the required accuracy of temperature measurement can still be guaranteed. Targets that are small and are in motion or in vibration; sometimes moving within the field of view, or may be partially out of the field of view. Under these conditions, using a two-color thermometer is the best choice. If it is impossible to aim directly between the pyrometer and the target, and the measurement channel is bent, narrow, and obstructed, the bicolor optical fiber pyrometer is the best choice. This is due to its small diameter, flexibility, and ability to transmit optical radiation energy over bent, blocked, and folded channels, and therefore can measure targets that are difficult to access, have harsh conditions, or are near an electromagnetic field.
This article provided by the infrared thermometer manufacturer Shanghai Duanhao Electric Technology Co., Ltd.!
[Endian Electric] how to determine the infrared temperature target size
Infrared thermometer based on the principle can be divided into monochrome thermometer and two-color thermometer (radiometer colorimeter). For monochromatic thermometers, when measuring temperature, the measured target area should be full of thermometer field of view. It is recommended that the measured target size exceed 50% of the size of the field of view. If the target size is smaller than the field of view, background radiation energy will enter the thermometer's visual symbol and interfere with the temperature readings, causing errors. Conversely, if the target is larger than the thermometer's field of view, the thermometer will not be affected by the background outside the measurement area. For colorimetric thermometers, the temperature is determined by the ratio of the radiant energy in two separate wavelength bands. Therefore, when the target to be measured is small and does not fill the field of view, there are smoke, dust, and blockage on the measurement path, and when the radiation energy is attenuated, it does not have a significant impact on the measurement results. For small but sporty or shocking targets, colorimetric thermometers are the best choice. This is due to the small diameter of the light and its flexibility to transmit light radiation energy in curved, blocked, and folded channels.