来自喵～星该文件为德国超声波检验规程
9.2 Determination of the area of discontinuities 裂纹区域的确定
9.2.1 Testing the flat product body 钢板主体的检测
9.2.1.1 Testing with double transducer probes 使用双传感器探头检测
The area of all the discontinuities giving responses that exceeded the characteristic curve shall be determined using the 6 dB technique, i.e. the contour of the discontinuity being defined as the positions of the centre of the probe when the response from the discontinuity is equal to half the maximum amplitude. A rectangle that encompasses the whole of the discontinuity is then determined, the major dimension of which is called the length of the discontinuity and the minor dimension the width of the discontinuity. The area of the rectangle is also calculated.
使用6分贝技术确定那些回声偏离特性曲线的裂纹区域，也就是裂纹的边缘定义为相应的回声振幅为裂纹的最大回声振幅一半位置时探头的中心点（所形成的曲线）。然后定义一个围绕该区域的矩形，该矩形的较长的边叫做裂纹的长度，较短的边则称为宽度，计算出裂纹的面积。
The area of the rectangle defines the area S of the discontinuity. Two nearby discontinuities shall be considered to represent a single discontinuity, the area being equal to the sum of the two if the distance between them is less than or equal to the length of the smaller of the two.
该矩形面积称之为裂纹面积S。如果相邻两个裂纹区域之间的距离小于或等于其中小的一个裂纹区域中的长度，则应将两个裂纹区域认同为一个。
9.2.1.2 Testing with single probes使用单传感器探头检测
The test consists of : 检测包括：
a) for class S0 and S1 flat product : determination of the area in accordance with the method defined in 8.2.1.1 ; 对于S0 和 S1级钢板产品：根据8.2.1.1章节设定的方法确定区域。
b) for class S2 and S3 flat product : simply counting of the discontinuities which can be done when they are detected using the characteristic curves for 5 mm, 8 mm and 11 mm diameter holes.
对于S2 和 S3级钢板产品：当使用5毫米、8毫米和11毫米直径的孔之特性曲线发觉裂纹时，简单计数。
The following is thus determined: 然后确定下列各项：
—for class S2 : the number of discontinuities giving echoes with an amplitude greater than the 11 mm diameter curve and the number N2 of discontinuities (Table 4) giving echoes with an amplitude between characteristic curves for the 8 mm and 11 mm diameter holes;
对于S2级钢板产品：回声振幅大于11毫米孔的特性曲线的裂纹个数和回声振幅在8毫米和11毫米孔的特性曲线之间的裂纹个数（表四）N2;
—for class S3 : the number of discontinuities giving echoes with an amplitude greater than the 8 mm diameter curve and the number N3 of discontinuities (Table 4) giving echoes with an amplitude between characteristic curves for the 5 mm and 8 mm diameter holes.
