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Factors Affecting the Accuracy of Infrared Thermometer Measurement Results

Factors Affecting the Accuracy of Infrared Thermometer Measurement Results


(1) temperature range
It is the most important performance of a thermometer. Each type of thermometer has its own specific temperature range. In general speaking, the lower the temperature range, the higher the output signal resolution, accuracy and reliability easy to solve; temperature range is too high, will reduce the temperature accuracy. Therefore, the user in the choice of thermometer must be measured before the temperature range is accurate, comprehensive, neither too low, nor too high, so that the thermometer temperature range can cover the measured temperature under the premise of small.


(2) Distance between target size, thermometer and test target In order to obtain accurate temperature reading, the distance between the thermometer and the test target must be within the proper range.


(3) Optical resolution (distance coefficient D: S) The distance coefficient is determined by D: S, that is, the ratio of the distance D between the probe and the target to the target diameter S. The higher the optical resolution, the higher the D: S ratio, the higher the cost of the thermometer. If the thermometer has to be used away from the target due to environmental conditions, but also to measure small targets, you should choose high-resolution thermometer.


(4) target emissivity
With the infrared thermometer receiving from the target infrared radiation power under the same circumstances, and because the target surface emissivity is different,it  will get different test results. Therefore, to use the infrared thermometer to measure the temperature of the object accurately, we must know the measured target emissivity value, and adjust the infrared thermometer ε value, so that the measured surface is equal to the emissivity value, the measured temperature Perform emissivity correction.


(5) Atmospheric decay and meteorological conditions:
Infrared radiation energy on the surface of the equipment is transmitted to the infrared thermometer, which is attenuated by the absorption of gas molecules, such as water vapor and carbon dioxide in the atmosphere and the scattering of suspended particulates in the air. The attenuation increases with the increase of the distance, The displayed temperature is lower than the actual temperature of the measured point. You can try to choose the condition that are without rain, no fog, no wind, the ambient temperature is more stable, the atmosphere is dry, clean when the measurement.Without affecting the safety conditions as short as possible to detect the detection distance.


For a colorimetric thermometer, the temperature is determined by the ratio of the radiant energy of two independent wavelength bands. So there is smoke on the measurement path, dust, blocking the radiation energy attenuation, will not have an impact on the measurement results. Even in the case of energy attenuation of 95%, still can guarantee the required temperature accuracy. For small and in motion or vibration among the target, colorimetric thermometer is the best choice. This is due to the small diameter of the light, flexible, can be in the bending, blocking and folding channel transmission of light radiation energy, it can measure difficult to close, poor conditions or close to the electromagnetic field of the target.


(6) Environment and background radiation
In addition to the radiation emitted by the corresponding parts of the equipment under test, the infrared radiation received by the testing instrument will reflect the reflection of other parts and backgrounds of the equipment and direct radiation into the solar radiation. These radiations will cause interference to the temperature of the device to be tested, resulting in errors. In order to reduce the impact of environmental and background radiation, the following measures can be taken:
1) in the outdoor measurement can choose to cloudy or in the sunset around the evening without light time;
2) indoor can be turned off the lights to avoid other radiation effects;
3) For highly reflective equipment surfaces, the appropriate measurement angle should be taken to avoid reflections;
4) to take appropriate occlusion measures in the measurement, thereby reducing the interference of background radiation.

 

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