基于超声C扫描的电触头钎焊质量评价

QUALITY EVALUATION OF THE BRAZED JOINT OF THE ELECTRICAL CONTACTS ON THE BASIS OF ULTRASONIC C-SCAN

钎着率是判断电触头钎焊质量的重要指标.提出了一种基于超声C扫描图象的钎着率计算方法,从而实现了电触头钎焊质量的自动评价.首先使用基于相依矩阵的平均对比度度量自动选取阈值,并用其对电触头钎焊界面超声C扫描图象实施阈值分割,然后计算针着率,并按照缺陷的回波高度特征对缺陷进行分类,最后,给出了实验结果.

A quality evaluation technique on the basis of ultrasonic C-scan was developed for the brazed joint of the electrical contacts. Firstly, threshold values were calculated by the average contrast measurement of the image based on a cooccurrence matrix. The ultrasonic C-scan image of the brazed joint of the electrical contacts was transformed into a lowerlevel image with the threshold values. Then, the brazed ratio, which could represent product quality, was calculated. According to the echo amplitude, flaws could also be classified. Experimental results were given finally.