“设计无缺陷的复杂系统是非常难的，”Kohno说。

"It's very hard to design complex systems that don't have bugs," Kohno said.

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逐层过程审核是一项持续的过程检查系统，用来验证正确的方法、设置、操作员技能、防误装置和其他输入是否到位从而确保产品无缺陷产生。

LPA is an ongoing system of process checks that verify proper methods, Settings, operator craftsmanship, error proofing devices and other inputs are in place to ensure a defect free product.

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对其检测原理和系统设计方案作了介绍，并对样本管进行了有缺陷和无缺陷的模拟试验，分别给出了所获得的信号。

Its detection principle and the schematic diagram of the system are introduced. Signals acquired from the sample pipe before and after seeding a simulated corrosion defect are given.

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