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使用红外热像仪对未切割分离的QFN封装在40~200℃进行了塑封料面、铜面和“缝”表面发射率的标定,并分别利用上述三面对实验环境的空气透射率进行了标定。结果表明:直接计算法和直接调节法可以很好地应用于塑封料发射率标定,直接计算法可以应用在“缝”处、铜面发射率标定。塑封料发射率标定结果在0.97左右;“缝”处发射率标定值随着温度升高由0.17~0.35呈线性递增趋势变化;铜面发射率标定值随温度升高出现先稳定后增大趋势。塑封料面、铜及“缝”处对空气透射率标定值在100%左右,上下波动不超过2%。该实验结果可为红外热像仪测定QFN的使用温度及切割分离时的温度提供相应参数。
The uncut and separated QFN package was calibrated with an infrared thermograph at 40 ~ 200 ℃ for the molding surface, the copper surface and the “seam” surface emissivity. The air permeability Calibrated. The results show that the direct calculation method and the direct adjustment method can be applied to the emissivity calibration of plastic materials, and the direct calculation method can be applied to the calibration of emissivity of copper surface. The calibration result of the emissivity of the molding material is about 0.97. The emissivity calibration value at the “stitch” increases linearly with the increase of temperature from 0.17 to 0.35. The calibrated emissivity of the copper surface increases first and then increases with temperature Trend. Plastic material surface, copper and “seam ” Department of air transmittance calibration value of about 100%, up and down fluctuations of not more than 2%. The experimental results can provide the corresponding parameters for measuring the temperature of the QFN and the temperature during cutting and separating by the infrared camera.