[Relationship between temperature range and wavelength bandwidth for multi band pyrometry].

In the present paper, based on the linearity spectral emissivity model with two parameters in the narrow investigated waveband, we extend tri-wavelength pyrometry to tri-band pyrometry through waveband measurements of radiation temperature. In tri-band pyrometry, in order to realize the non-distortion measurement, considering the effect of the dynamic range and the minimum sensibility of the sensor on the coupling relation of multi-channel signals, the restriction condition of the effective temperature measurement range is discussed. However, under the assumption of the fixed sensor parameters, the measurement bandwidth of the sensor is an important influencing factor to the effective temperature measurement range in applications of tri-band pyrometry. Then for the measured objects with the known radiation characteristics, the variation of the effective temperature measurement range with the bandwidth of the sensor is presented through numerical simulations. So the required condition of bandwidth of the sensor is theoretically determined through the above discussions of the effective temperature measurement range. The analyses in this paper may provide the necessary theoretical guides to the design of the sensor of radiation temperature measurement.

[Analyses of spectral emissivity in radiation temperature measurement].

The complexity of the spectral emissivity of actual surfaces is the key point in the research and applications of radiation temperature measurement, resulting in the difficulty in the achievement of the temperature measurement. In the present paper, based on the discussions of the Taylor expansion, the non-dimension wavelength and the exponent, the authors describe the mathematical expression of the spectral emissivity of actual surfaces, and establish the general spectral emissivity function. Through the fitting of experimental data of the spectral emissivities of different metals at different temperatures, the applicability of the spectral emissivity function is verified which especially becomes the fundamental in the research of primary spectrum pyrometry.

[The temperature field partition for primary spectrum pyrometry].

In the applications of primary spectrum pyrometry to the detection of temperature, through the analysis of the coupled multi-channel signals, the authors investigated the necessary condition under which all temperatures can be measured simultaneously and effectively. For the case not satisfying the above condition, the authors put forward the concept of temperature field partition. And the process of the temperature field partition is detailedly described, and the simulation results are given. Ths study is significative for the applications of primary spectrum pyrometry.

[Correlativity analysis based on radiation spectrum of correlated color temperature and thermodynamic temperature of a radiating source].

Correlated color temperature, which describes the chromaticity characteristics of a radiating source, is different from its thermodynamic temperature derived from primary spectrum pyrometry. However, establishing their mathematical relationship is feasible. Therefore, the authors theoretically analyzed the variation rule of the correlativity difference between the correlated color temperature of the source and its thermodynamic temperature with the emissivity parameter. And the authors gave the corresponding numerical simulation results. The above theoretical and numerical discussions will make it possible that a colorimeter used to measure the correlated color temperature serves as a pyrometer to realize the measurement of the thermodynamic temperature.