Abstract
Colorimetric temperature measurement has important applications in industrial production. However, it’s usually applied to high temperature measurement because it lacks accuracy in medium-low temperature measurement. Aimed at improving the low accuracy of traditional colorimetric temperature measurement method in medium-low temperature measurement, this paper pays attention to the influence of ambient temperature on colorimetric temperature measurement method, especially focusing on the influence of ambient temperature on the measured target and the non-refrigerated infrared detector, and improves the traditional method by considering the influence of ambient temperature. Experimental results show that in the experimental temperature range, the relative error of the method proposed in this paper is less than 1.2%, while the relative error of traditional method is less than 4.0%. So this method can significantly improve the precision of temperature measurement especially in medium-low temperature measurement.
Highlights
Temperature measurement has important applications in industrial production.Temperature measurement can be divided into contact and non-contact measurement
This paper discusses the basic principle of colorimetric temperature measurement, analyses the influence of ambient temperature on the target temperature and infrared detector, and how traditional colorimetric measurement method of calibration and measurement method is improved considering the influence of ambient temperature
If measured target temperature is T1, ambient temperature is T2, the radiation emitted per unit area is AεσT14, the radiation absorbed per unit area is AεσT24, the net radiation emitted by objects Q is: Q= AεσT14- AασT24 (5)
Summary
Temperature measurement has important applications in industrial production.Temperature measurement can be divided into contact and non-contact measurement. Colorimetric temperature measurement method is usually applied to high temperature measurement(over 600 degree) [3,4] It lacks accuracy in medium-low temperature measurement because the influence of ambient temperature should be considered. It’s based on the measurement of two given wavelength λ1 and λ2, and calculates the radiation power ratio under the two wavelength In this way, the temperature of the object can be calculated, while the measured temperature is called colorimetric temperature [5]. From Eq 2 it can be known that if the ratio R can be calculated, the temperature of the object T can be calculated too When using this method to measure the temperature of blackbody TS, the ratio of the outputs of two channels is: R= V1/ V2= K1ε1λ1-5e-C2/λ1TS /(K2ε2λ2-5 e-C2/λ2TS). According to the definition of colorimetric temperature, the relationship between colorimetric temperature and real temperature of the measured target can be expressed as: 1/T-1/TS=λ1λ2(lnε2- lnε1)/[C2(λ2-λ1)]
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