1.1 本规程描述了数字探测器阵列（DDA）的评估，并确保有一个通用标准用于定量比较DDA，以便选择适当的DDA以满足无损检测要求。 1.2 本规程旨在供DDA制造商或集成商使用，以提供DDA特性的定量结果，供NDT用户或买方使用。其中一些测试需要专门的测试模型，以确保供应商或制造商之间结果的一致性。这些测试不是为了让用户完成，也不是为了进行长期稳定性跟踪和寿命测量。然而，如果需要的话，它们可以用于此目的。 注1: 有关DDAs应用的更多信息，请参阅指南 E2736 和实践 E2698 和 E2737 . 1.3 根据本规程报告的结果应基于一组特定型号的至少三个单独探测器。 1.4 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 本实践提供了一种在一组常见技术测量上比较DDA的方法，认识到在实践中，即使使用不同的DDA、给定的几何放大率或其他可能弥补设备一个缺点的工业放射学设置，也可以进行调整以获得类似的结果。 4.2 用户应该理解本实践中使用的定义和相应的性能参数，以便就如何在目标应用程序中使用给定的DDA做出明智的决定。 4.3 将为每个DDA评估的因素包括:插值基本空间分辨率( iSR公司 b 探测器 )，效率（归一化检测器 信噪比 ( 信噪比 N )在1 mGy时，对于不同的能量和光束质量），可实现的对比灵敏度( CSa公司 )，具体材料厚度范围( SMTR )和ISO-MTL、图像滞后、老化、坏像素分布和统计以及内部散射比( ISR公司 ). 4.4 鉴于在以下许多章节中对这些参数进行了讨论，以下列表将有助于为给定测试选择关键部分，如下所示。应注意的是，需要本文件的其他章节为测试参数建立适当的技术。注意，对于每个参数（测试），列出的第一部分通常是仪器或量规（如果需要），列出的第二部分是标准化测量，列出的第三部分涉及分析或计算: 4.4.1 对于iSR b 探测器 , 看见 5.1 , 7.7 , 8.2 . 4.4.2 对于探测器效率， 看见 5.3 , 7.8 , 8.3 . 4.4.3 对于CSa， 看见 5.2 , 7.9 , 8.4 . 4.4.4 对于SMTR， 看见 5.2 （或 7.9 ，如果已经完成）， 7.10 , 8.5 . 4.4.5 对于ISO-MTL， 看见 5.2 （或 7.9 ，如果已经完成）， 7.10 , 8.6 . 4.4.6 对于图像延迟， 看见 7.11.1 , 8.7.1 . 4.4.7 对于磨合， 看见 5.4 , 7.11.2 , 8.7.2 . 4.4.8 对于坏像素测试， 看见 6.2 , 7.12 , 8.8 . 4.4.9 对于ISR， 看见 5.4 , 7.13 , 8.9 .

1.1 This practice describes the evaluation of Digital Detector Arrays (DDAs), and assures that one common standard exists for quantitative comparison of DDAs so that an appropriate DDA is selected to meet NDT requirements. 1.2 This practice is intended for use by manufacturers or integrators of DDAs to provide quantitative results of DDA characteristics for NDT user or purchaser consumption. Some of these tests require specialized test phantoms to assure consistency among results among suppliers or manufacturers. These tests are not intended for users to complete, nor are they intended for long term stability tracking and lifetime measurements. However, they may be used for this purpose, if so desired. Note 1: Further information on application of DDAs is contained in Guide E2736 and Practices E2698 and E2737 . 1.3 The results reported based on this practice should be based on a group of at least three individual detectors for a particular model number. 1.4 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 This practice provides a means to compare DDAs on a common set of technical measurements, realizing that in practice, adjustments can be made to achieve similar results even with disparate DDAs, given geometric magnification, or other industrial radiologic settings that may compensate for one shortcoming of a device. 4.2 A user should understand the definitions and corresponding performance parameters used in this practice in order to make an informed decision on how a given DDA can be used in the target application. 4.3 The factors that will be evaluated for each DDA are: interpolated basic spatial resolution ( iSR b detector ), efficiency (normalized Detector SNR ( SNR N ) at 1 mGy, for different energies and beam qualities), achievable contrast sensitivity ( CSa ), specific material thickness range ( SMTR ) and ISO-MTL, image lag, burn-in, bad pixels distribution and statistics and internal scatter ratio ( ISR ). 4.4 Given that each of these parameters are discussed together in many of the following sections, the following list will be helpful in selecting the key sections for a given test as follows. It should be noted that other sections of the document are needed to establish the appropriate technique for the parameter under test. Note that for each parameter (test), the first section listed is typically an apparatus or gauge (if required), the second section listed are the standardized measurements, and the third section listed involves the analysis or computations: 4.4.1 For iSR b detector , see 5.1 , 7.7 , 8.2 . 4.4.2 For Detector Efficiency, see 5.3 , 7.8 , 8.3 . 4.4.3 For CSa, see 5.2 , 7.9 , 8.4 . 4.4.4 For SMTR, see 5.2 (or 7.9 , if already completed), 7.10 , 8.5 . 4.4.5 For ISO-MTL, see 5.2 (or 7.9 , if already completed), 7.10 , 8.6 . 4.4.6 For Image Lag, see 7.11.1 , 8.7.1 . 4.4.7 For Burn-in, see 5.4 , 7.11.2 , 8.7.2 . 4.4.8 For Bad Pixel Tests, see 6.2 , 7.12 , 8.8 . 4.4.9 For ISR, see 5.4 , 7.13 , 8.9 .