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金属复合引线
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  metal composite leads
    An Experimental Research on the CTE Measurement of Metal Composite Leads Using Laser Speckle Interferometry
    激光散斑干涉法测量金属复合引线热膨胀系数的实验研究
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    High precision CTE of the metal composite leads can be got with the relatively simple experimental equipments.
    在相对简单的实验设备下,得到较高精度金属复合引线的热膨胀系数值。
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The coefficient of thermal expansion (CTE) is very important for studies of composite and thermo-mechanical analysis. Accurate determination of CTE needs precise measurements of deformation and temperature change. Traditional methods of measuring CTE have special requirements to the shape, size and surface of specimens. A new experimental technique on the CTE measurement of metal composite leads in electronic packaging using laser speckle interferometry was presented. Gold leads with known CTE were used as standard...

The coefficient of thermal expansion (CTE) is very important for studies of composite and thermo-mechanical analysis. Accurate determination of CTE needs precise measurements of deformation and temperature change. Traditional methods of measuring CTE have special requirements to the shape, size and surface of specimens. A new experimental technique on the CTE measurement of metal composite leads in electronic packaging using laser speckle interferometry was presented. Gold leads with known CTE were used as standard specimens for reference and the precise measurement of temperature change was then not needed. The proposed test method has a very high precision and sensitivity and no special requirements to the shape, size and surface of specimens. Laser speckle fringe patterns could be observed after specimens were heated up 10℃ and the real time patterns were obtained in the computer under different temperatures, from which the information of in-plane displacements of the specimens could be extracted. Post-processing of the patterns was conducted in the computer′s imaging processing system. This method can also avoid the precise measurement of geometric parameters of the beam path. High precision CTE of the metal composite leads can be got with the relatively simple experimental equipments. The method presented in this paper can be widely used in measuring the CTE of various new materials.

本文采用激光散斑干涉法测量微电子金属封装用金属复合引线的热膨胀系数。该方法有很高的测量精度和灵敏度,并对试件形状、尺寸和表面无特殊要求。同时利用光学方法全场测量的优点,使用已知热膨胀系数的金属材料作为标准试件,可减少温度场不均匀分布及微小变化对测试精度的影响,消除了测量光路几何参数导致的系统误差。在相对简单的实验设备下,得到较高精度金属复合引线的热膨胀系数值。该方法可广泛用于各种新材料的热膨胀系数的测定。

 
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