一种新的适用于不同温度状态下岩石温度与发射率分离的平滑度函数  

A new Smoothness Function for Temperature and Emissivity Separation of Rocks at Different Temperature States

作　　者：王俊虎[1] 武鼎[1] 郭帮杰 朱黎江[1] WANG Junhu;WU Ding;GUO Bangjie;ZHU Lijiang(National Key Laboratory of Remote Sensing Information and Image Analysis Technology Beijing Research institute of Uranium Geology,Beijing 100029,China;China Institute of Nuclear Industry Strategy,Beijing 100048,China)

机构地区：[1]核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室,北京100029 [2]中核战略规划研究总院,北京100048

出　　处：《世界核地质科学》2023年第4期1002-1008,共7页World Nuclear Geoscience

基　　金：国家自然科学基金项目《甘肃芨岭地区碱交代型铀矿SiO_(2)含量阈值和蚀变矿物光谱特性研究》(编号:42202331)资助。

摘　　要：岩石的温度和发射率光谱数据在岩性、构造和蚀变矿物等成矿要素信息识别中具有重要的应用价值,但实现岩石热辐亮度数据的温度和发射率高精度分离,是困扰地学工作者的技术难题。本次研究基于光谱平滑迭代法的数学原理,设计了一种新的可实现岩石温度和发射率高精度分离的WJH平滑度函数。以野外采集的石英脉岩石样品为实验样本,使用102F傅立叶变换光谱仪采集了该样品在常温及加热升温4种不同温度状态下的热红外辐亮度数据,基于WJH平滑度函数实现了该样品在4种不同温度下的温度和发射率分离。通过与测温仪实测温度数据相比,基于WJH平滑度函数分离的温度与测量值相差均小于0.6℃。分离的发射率曲线与标准矿物光谱库发射率曲线基本一致,而且随着样品温度的升高,分离的发射率数据信噪比更高,说明了基于WJH平滑度函数分离的温度和发射率数据准确可靠。研究表明:设计的WJH平滑度函数可替代当今流行的Borel、Bower等国外学者提出的平滑度函数,实现岩石在不同温度状态下温度和发射率的高精度分离,在基础地质调查和矿产勘查领域具有广阔的应用前景。The temperature and emissivity data of rocks play an important role in the evaluation of metallogenic conditions such as lithology and geological structures,thermal inertia information and altered mineral information.However,how to realize the high precision separation of temperature and emissivity data of rocks at different temperatures is also the technical problem that puzzles geo⁃science researchers for long time.Based on the analysis of current temperature and emissivity separation algorithms,a new WJH smoothness function was designed to separate the temperature and emissivity of rocks with high accuracy based on the mathematical principle of spectral smoothing iterative algorithm.The sample of quartz vein collected in the field and the 102F Fourier Transform Spectrometer were used to collect the thermal infrared radiance data at the room with four different temperatures(29,33,36,39℃).The temperature and emissivity data separation of the sample at four different temperatures were realized based on WJH smoothness function.Compared to the temperature measured by the thermometer,the temperature differences were 0.32,058,0.44 and 0.42℃between the temperature separated from WJH smoothness function and the temperature measured by the thermometer,the temperature differences were all less than 0.6℃.The emissivity spectrum separated by the WJH smoothness function was basically consistent with the emissivity spectrum of the standard mineral spectrum library,the residual radiation bands in the emissivity spectrum of quartz mineral were very clear,moreover,the signal⁃to⁃noise ratio of emissivity data was higher with the temperature increase of the sample.It was proven that the temperature and emissivity data separated by WJH smoothness function were accurate and reliable.The research results showed that the WJH smoothness function designed in the paper could replace the popular smoothness functions designed by Borel,Bower and other researchers from foreign countries,and realize the separation of temperature

关 键 词：不同温度状态 岩石 温度与发射率 分离 平滑度函数 

分 类 号：O433.3[机械工程—光学工程] TP7[理学—光学]