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介绍了冷轧带钢在剪切过程中对钢板位置进行检测和控制的必要性以及生产要求，并详细介绍了用超声检测装置代替进口光幕的设计原理和方法，同时还介绍了利用硬件和软件结合滤除各种干扰信号的方法。
This paper introduces the necessity and production requirements of cold rolled strip steel for testing and controlling the position of steel plate in the process of shearing, and introduces the design principle and method of using ultrasonic testing device instead of imported light curtain in detail. At the same time, Software combined with various interference signal filtering method.