Proficiency Testing Method for Nondestructive Testing Laboratory Based on Z Score and En Ratio
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摘要: 无损检测(NDT)实验室或机构的检测能力直接影响检测的可靠性和一致性。将Z比分数和En比率值两种统计方法应用于无损检测实验室的检测能力比对，验证其检测能力。结合无损检测实验室的特点，以常用的焊缝超声检测为实例，设计了模拟比对试验。应用两种统计方法对比对的结果进行了分析，并对各模拟实验室的能力进行了评价。比对结果表明，Z比分数和En比率值两种不同的比对方法得出的评价结果相似，均可应用于无损检测实验室或机构的检测能力比对。Abstract: The inspection proficiency of nondestructive testing laboratory can affect directly the reliability and consistence of inspection results. In the paper, two statistical methods of Z score and En ratio are used for the proficiency comparison in nondestructive testing laboratory to verify their inspection ability. According to the characteristics of nondestructive testing laboratory and based on welding ultrasonic testing, the simulated comparison tests are designed. Using the two statistical methods, the comparison results are analyzed, and the inspection ability of every simulated laboratory is evaluated. The comparison results show that the evaluation conclusions obtained from Z score and En ratio methods are similar, and both of the two statistical methods can be used for testing the proficiency of non-destructive testing laboratory.
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