Earticle

The non-source temperature calibration method of the multi-spectral pyrometer (MSP), put forward in the previous article, is the non-source calibration method based on the MSP transfer function (NCCTF). In this paper, the practicability of NCCTF is researched. The situations that maybe encountered of the temperature points in the actual calibration process are simulated. The impact of the intervals temperature points of different number and unequal intervals temperature points on the NCCTF accuracy are researched theoretically to determine the temperature points select method. Simulation experimental results show that the NCCTF can meet the actual calibration process with good usability.

In the field of multi-spectral temperature measurement, the high-temperature blackbody furnace is applied to calibrate the multi-spectral pyrometer (MSP). The material of the blackbody furnace is graphite and its melting point is 3000℃. As a result, the MSP is not able to be calibrated above 3000℃ (non-source temperature) and the measurement range of MSP is limited to lower than 3000℃. Currently, the needs of the temperature measurement above 3000 ℃ are gradually increasing. To solve the problem above, the non-source temperature calibration method based on curve similarity principle (NCCSP) is proposed. The core idea of the NCCSP is that the mathematical model is formed based on curve similarity of the MSP output and the power function and then the derivative fitting which can control the curve trend well is applied to obtain model parameters to achieve the purpose that apply the calibration data below 3000 ℃ to predict the calibration data above 3000 ℃. The NCCSP is significance to expand multi-spectral pyrometer measurement range and supplement multispectral temperature measurement theory. The working-wavelength number of MSP is from a few to hundreds, under which the NCCSP is more accurate needs to be further researched. Therefore, in this paper, the impacts on the NCCSP accuracy of the working-wavelength selection are researched. Combine with Planck's law by theoretical simulation method to get the working-wavelength selection basis.