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Main Points Of Using Infrared Thermometer
Oct 31, 2017

1. Determine the temperature range

Determine the temperature range: Temperature measurement range is the most important performance indicators. Some thermometer product range can reach -50℃-+3000℃, but this can not be done by a type of infrared thermometer. Each type of thermometer has its own specific temperature range. Therefore, the user's measured temperature range must be considered accurate, comprehensive, neither too narrow, nor too wide. According to the law of Blackbody radiation, the change of the radiant energy caused by the temperature in the Short-wave section of the spectrum will exceed the change of the radiated energy caused by the error of emissivity, therefore, it is better to use shortwave when measuring temperature. Generally speaking, the narrower the range of temperature measurement, the higher the resolution of the output signal, the more accuracy and reliability is easy to solve. The temperature range is too wide to reduce the precision of temperature measurement. For example, if the target temperature is 1000 ℃, first determine whether the online or portable, if it is portable. There are many models to meet this temperature, such as 3ILR3, 3i2m, 3i1m. If the measurement accuracy is the main, preferably 2M or 1M model, because if the selection of 3iLR type, its temperature range is very wide, the high temperature measurement performance will be poor; if the user in addition to measuring 1000 ℃ targets, but also to take care of the cold target, it had to choose 3ILR3.

2. Determine the target size

Infrared thermometer According to the principle can be divided into monochrome thermometer and two-color thermometer (radiation colorimetric thermometer). For the monochromatic thermometer, the target area should be filled with the field of temperature measuring instrument when the temperature measurement is carried out. It is recommended that the measured target size exceed 50% of the field size. If the target size is smaller than the field of view, the background radiant energy will enter the representation branch of the thermometer to interfere with the temperature reading, resulting in error. Conversely, if the target is larger than the visual field of the thermometer, the thermometer will not be affected by the background outside the measurement area. For colorimetric thermometer, not full of the field of view, the measurement path of smoke, dust, blocking, the radiation energy attenuation, no significant impact on the measurement results. Colorimetric thermometers are the best choice for small, moving or vibrating targets. This is due to the small diameter of the light, flexible, can be curved, blocked and folded channels of transmission of light radiation energy.

For some thermometers, the temperature is determined by the ratio of the radiant energy within the two independent wavelength bands. Therefore, when the target is very small, not filled with the scene, the measurement path of smoke, dust, blocking on the radiation energy attenuation, will not affect the measurement results. Even in the case of energy attenuation of 95%, the accuracy of the required temperature measurement can still be ensured. A target that is small and in motion or vibration, sometimes moving in the field, or possibly partially moving out of the field, under which the use of a two-color thermometer is the best choice. Double-color fiber optic thermometer is the best choice if it is impossible to aim directly between the thermometer and the target, and the measurement of the channel is curved, narrow and obstructed. This is due to its small diameter and flexibility, which can transmit light radiation energy on curved, obstructed and folded channels, so that it can measure targets that are inaccessible, harsh conditions or near electromagnetic fields.

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