Approach method based on brightness temperature for multi-spectral thermometer

摘要：

It is known from relationship between brightness temperature and true temperature of a multi-spectral thermometer that brightness temperature is equal to true temperature if the wavelength approaches to zero. Thus true temperature can be acquired by fitting brightness temperatures and corresponding wavelengths using non-linear least squares method. This method was named AMBT (approach method based on brightness temperature). The emissivities of metals and nonmetals were used to simulate AMBT at a temperature from 160K to 3000K. The effective wavelengths chosen are 3.00, 3.25, 3.50, 3.75, 4.00, 4.25, 4.50 and 4.75 micron in the atmospheric window of 3-5 micron. While in another atmospheric window of 8-12 micron, the effective wavelengths are 8.00, 8.50, 9.00, 9.50, 10.00, 10.50, 11.00 and 11.50 micron. Actual measurements were used to verify the effectiveness of AMBT. Results show that the errors are always smaller at a lower temperature and increase with the increase in temperature. The errors of 3-5 micron are lower than those of 8-12 micron. At same temperature, the errors of metals are lower than those of non-metals. AMBT is more accurate to be used at a low temperature than be used at a high temperature. AMBT can be used to identify materials in common use, offering a new method to get true temperature of low temperature objects.

关键词： Approach method brightness temperature emissivity true temperature

作者: Guibin Yuan Zhigang Fan Xiaogang Sun Jingmin Dai

作者单位: Research Center of Space Optics Engineering, Harbin Institute of Technology Dept. of Automation Meas Research Center of Space Optics Engineering, Harbin Institute of Technology Dept. of Automation Measurement and Control Engineering, Harbin Institute of TechnologyHarbin, 15000 Dept. of Automation Measurement and Control Engineering, Harbin Institute of Technology Harbin, 1500

会议类型: 国际会议

会议名称: 第五届仪器科学与技术国际学术会议(ISIST 2008)Fifth International Symposium on Instrmentation Science and Technology

会议地点: 沈阳

会议语种:英文

页码: 1-10

在线出版日期: 2008-09-15（万方平台首次上网日期，不代表论文的发表时间）