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金属熔点温度和法向光谱发射率数据是国际上对电流脉冲加热技术测量材料热物性参数的关键比对点。针对连续测量金属熔点附近温度的特点,提出了一种新的发射率假设模型,并在此基础上提出了一种新的多光谱高速高温计的数据处理方法。该方法只需使用多光谱高速高温计作为测量装置,通过处理两个不同时刻多光谱高速高温计的测量数据,由计算可同时获知两个时刻的真温及光谱发射率。经对国外的标准铌试样进行了测试,所得数据与国外同行的测量数据进行了比对,具有较好的一致性,实验结果表明,熔点真温计算值与生产者提供的值之差在±20K以内。
Metal melting point temperature and normalized spectral emissivity data are the key international comparison points for measuring the thermophysical properties of materials by current pulse heating technique. A new model of emissivity hypothesis is proposed for the continuous measurement of the temperature near the melting point of metal. On this basis, a new data processing method for multi-spectral pyrometer is proposed. The method only needs to use multi-spectral high-speed pyrometer as the measuring device. By processing the measured data of two multi-spectral high-speed pyrometers at different times, the real temperature and spectral emissivity of the two moments can be obtained simultaneously by calculation. After the standard niobium samples have been tested abroad, the data obtained are compared with the data from foreign counterparts and have good consistency. The experimental results show that the difference between the calculated value of melting point and the value provided by the producer is between Within ± 20K.