基于热成像的材料热扩散率测量方法研究
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摘要
将一种基于热成像的薄片材料热扩散率测量方法的理论模型由二维拓展到三维,以适用于更大厚度材料的热扩散率测量。指出该方法适用的特征条件为:Z向空间导数值与材料表面和周围环境的温度差值为线性关系。仿真分析了传热距离与激励时间对特征条件的影响以及相关的信噪比问题,并在304不锈钢材料实测实验中依照仿真分析设置传热距离和激励时间以满足特征条件,结果显示厚度为1 mm和2mm的不锈钢材料测量偏差均在3.0%以内,厚度为5 mm的不锈钢材料测量的偏差为4.1%,从而扩大了该测量方法的适用范围。
The thermal diffusivity measurement method of the thin specimens based on thermography technology is researched and improved,and the theoretical model is developed from two-dimensional model to three-dimensional model,so that the materials with bigger thickness can be measured by this method.The characteristic condition,which must be satisfied when this measurement method,can be used,is that the relationship between the spatial derivatives of temperature in Z-direction and temperature difference between the surface temperature of material and environmental temperature is a linear relation.The effects of conducting distance and excitation time on the characteristic condition are analyzed,and the relevant problems of signal to noise ratio by the simulation experiment are also studied.Setting the conducting distance and excitation time according to the simulation analysis when measure the thermal diffusivity of 304 stainless steel,the results show that the deviation of the measurement for the stainless steel with thickness of 1 mm and 2 mm is less than 3.0%,and the deviation of the measurement for the stainless steel with thickness of 5 mm is 4.1%,so the range of application of the measuring method is expand.
The thermal diffusivity measurement method of the thin specimens based on thermography technology is researched and improved,and the theoretical model is developed from two-dimensional model to three-dimensional model,so that the materials with bigger thickness can be measured by this method.The characteristic condition,which must be satisfied when this measurement method,can be used,is that the relationship between the spatial derivatives of temperature in Z-direction and temperature difference between the surface temperature of material and environmental temperature is a linear relation.The effects of conducting distance and excitation time on the characteristic condition are analyzed,and the relevant problems of signal to noise ratio by the simulation experiment are also studied.Setting the conducting distance and excitation time according to the simulation analysis when measure the thermal diffusivity of 304 stainless steel,the results show that the deviation of the measurement for the stainless steel with thickness of 1 mm and 2 mm is less than 3.0%,and the deviation of the measurement for the stainless steel with thickness of 5 mm is 4.1%,so the range of application of the measuring method is expand.
引文
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[11]刘建庆,孙建平,陈跃飞,等.非稳态法测量材料热扩散率方法综述[J].计量技术,2009,(12):26-29.
[12]孙建平,刘建庆.样品厚度对热扩散率测量影响的实验研究[J].计量学报,2007,28(z1):86-89.
[13]王晓娜,厉阳,侯德鑫,等.基于热成像的薄片材料热扩散率快速无损检测[J].计量学报,2016,37(3):260-264.
[14]孙建平,刘建庆,邱萍,等.激光闪光法测量材料热扩散率的漏热修正[J].计量技术,2008,(1):23-25.
[15]谭真,郭广文.工程合金热物性[M].北京:冶金工业出版社,1994.
[2]陈跃飞,张金涛,于帆,等.激光闪光法测量材料热扩散率国际比对的实验研究与分析[J].计量技术,2008,(12):29-32.
[3]邱萍,孙建平,段宇宁.激光闪光法测量材料热扩散率标准装置的研制[J].计量学报,2007,28(z1):82-85.
[4]于帆,张欣欣,何小瓦.材料热物理性能非稳态测量方法综述[J].宇航计测技术,2006,26(4):23-30.
[5]于帆,张欣欣,何小瓦.非稳态平面热源法同时测量材料的导热系数和热扩散率[J].宇航计测技术,2006,26(6):13-17.
[6]Shekhani H N,Uchino K.Thermal diffusivity measurements using insulating and isothermal boundary conditionns[J].Review of Scientific Instruments,2014,85(1):015117.
[7]Qiu P,Zhang S,Wu S,et al.Characterisation of thermal property of materials by infrared thermography[J].Nondestructive Testing and Evaluation,2010,25(1):91-98.
[8]Lakestani F,Salerno A,Volcan A.Modulated spot heating for the measurement of thermal diffusivity[J].Journal of Applied Physics,2005,97(1):013704.
[9]Zhou J,Yang Y,Magne L,et al.Determination of thermal conductivity of magnesium-alloys[J].Journal of Central South University of Technology,2001,8(1);60-63.
[10]BouéC,HoléS.Infrared thermography protocol for simple measurements of thermal diffusivity and conductivity[J].Infrared Physics&Technology,2012,55(4):376-379.
[11]刘建庆,孙建平,陈跃飞,等.非稳态法测量材料热扩散率方法综述[J].计量技术,2009,(12):26-29.
[12]孙建平,刘建庆.样品厚度对热扩散率测量影响的实验研究[J].计量学报,2007,28(z1):86-89.
[13]王晓娜,厉阳,侯德鑫,等.基于热成像的薄片材料热扩散率快速无损检测[J].计量学报,2016,37(3):260-264.
[14]孙建平,刘建庆,邱萍,等.激光闪光法测量材料热扩散率的漏热修正[J].计量技术,2008,(1):23-25.
[15]谭真,郭广文.工程合金热物性[M].北京:冶金工业出版社,1994.