| Multi-spectral thermometry is to get the brightness information of several spectrums from different channels. Then the temperature and spectral emissivity of material is calculated through processing the information data. This method has been quickly developed in the latest years because of the capability to get true temperature and emissivity without auxiliary instruments or other additional information.There are three mathematical models of multi-spectral thermometry based on calibration factor, brightness temperature and reference temperature respectively. The ten-wavelength pyrometer is developed for the demand of China Jiliang University. The mathematical model is based on brightness temperature. The data is processed with least square fitting and the software is programmed with VC++. Prismatic decomposition avoided the energy attenuation and instability. The detector is a silicon photoelectric diode array S4111-35Q made in Japan. The difference from the former data acquisition is choosing a 16-bit ADC module based on USB bus. This module reduces the complexity of programming and operating. It also abolishes the data communication between different equipments. A range automatic transfer is designed for the preamplification system with resistance feedback.For the design mentioned above, the whole system has the feature of small dimension, easy operating and high accuracy. It's a great improvement over the past multi-spectral pyrometers and will make the pyrometer work well under more complicated situations.
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