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利用快速傅里叶变换 ( FFT)对非穿透焊缝的激光致等离子光信号进行分析时发现 ,熔深波动的焊缝段的光强出现下降趋势 ,并且其光信号频谱中的主频峰也随之消失。
The analysis of the laser-induced plasma optical signal of non-penetrating weld using Fast Fourier Transform (FFT) shows that the light intensity of the weld zone fluctuating decreases, and the dominant frequency band in the optical signal spectrum Also will disappear.