检验热交换器钢管的技术,必须满足如下要求,特别是传感器更应如此: (1)可以从管子的内壁进行探测; (2)能准确地检测管子内外缺陷,并测定缺陷尺寸; (3)既能检测壁厚逐渐减薄情况,又能测定缺陷分布; (4)测定缺陷的起点; (5)能鉴别缺陷与非缺陷信号,例如来 In order to check the technology of the heat exchanger steel pipe, the following requirements must be met, especially the sensor: (1) It can detect from the inner wall of the pipe; (2) It can accurately detect the internal and external defects of the pipe and measure the defect size; (3) Can detect the gradual thinning of the wall thickness, but also determine the distribution of defects; (4) determine the starting point of defects; (5) to identify defects and non-defective signals, for example