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Comprehensive introduction to infrared thermometers in three aspects
- 2019-01-08-

Today, Wuxi very Xiang Technology Co., Ltd. will give you a comprehensive introduction to infrared thermometers in three aspects:

A: Temperature measurement scale

Temperature measurement scale is an important performance indicator of the thermometer. Such as INFR (infrared era), Raytek (Raytech) products cover the scale of -50 ℃-+3000 ℃, but this can not be done by a type of infrared thermometer. Each type of thermometer has its own specific temperature scale. Therefore, the user's measured temperature scale must be considered accurate and comprehensive, neither too narrow nor too wide. According to the black body radiation law, the change of radiant energy caused by temperature in the short wavelength band of the spectrum will exceed the change of radiant energy caused by emissivity errors. Therefore, it is better to use short waves when measuring temperature. Generally speaking, the narrower the temperature measurement scale, the higher the resolution of the output temperature monitoring signal, and the simpler the accuracy and reliability are. The temperature measurement scale is too wide, which will reduce the temperature measurement accuracy. For example, if the measured target temperature is 1000 ° C, first confirm whether it is online or portable, and if it is portable. Many types are satisfied with this temperature, such as Ti315, Ti213 and so on.


B: Policy scale

Infrared thermometers can be divided into monochrome thermometers and dual-color thermometers (radiochromatic thermometers) according to the principle. Regarding the monochromatic thermometer, when measuring the temperature, the area of the measured policy should be filled with the field of view of the thermometer. It is recommended that the measured policy scale exceed 50% of the field of view size. If the target scale is smaller than the field of view, the radiant energy of the scene will enter the visual sound of the thermometer to disturb the temperature readings and form errors. Conversely, if the policy is larger than the field of view of the thermometer, the thermometer will not be affected by the setting outside the measurement area.


Regarding the two-color thermometer, its temperature is confirmed by the ratio of the radiant energy in two independent wavelength bands. Therefore, when the measurement target is small, not full of the scene, and there is smoke, dust, or obstruction on the measurement path that attenuates the radiant energy, it will not affect the measurement results. Even in the case of energy attenuation of 95%, the required temperature accuracy can still be guaranteed. Regarding the policy that is fine and is in motion or vibration; sometimes it is a policy that moves in the field of view or may partially move out of the field of view. Under these conditions, using a two-color thermometer is a good choice. If it is impossible to directly aim between the thermometer and the guideline, the two-color fiber optic thermometer is a good choice when the measurement channel is curved, narrow, and blocked. This is because of its small diameter and flexibility, which can transmit light radiation energy on curved, obstructed and folded channels, so it can measure policies that are difficult to access, harsh conditions, or close to electromagnetic fields.


C: Optical resolution

The optical resolution is confirmed by the ratio of D and S, which is the ratio of the interval between the thermometer and the target D to the diameter S of the measuring spot. For example, the domestic handheld infrared thermometer Ti213 has an interval coefficient of 80: 1. If it is 80 cm away from the guideline, the diameter of the measurement scale is 1 cm. If the thermometer must be installed away from the guideline due to environmental conditions, and you need to measure a small guideline, you should choose a thermometer with high optical resolution. The higher the optical resolution, the larger the D: S ratio, the higher the cost of the thermometer.

The above is a comprehensive introduction to the infrared thermometer


Convenient infrared thermometer