1.1 本指南涵盖了对小零件进行声发射（AE）检查的技术。它仅限于整个检查区域AE信号衰减较低的检查对象（或较大对象的定义区域）。这消除了基于克服距离上的信号损失的复杂衰减因子校正和多传感器和阵列布置的考虑。 1.2 本指南将典型的AE检查假设为存在受控或测量的应力作用在AE监测的零件上的情况。特别强调传感器和系统选择、传感器布置、强调注意事项、降噪/抑制技术、空间滤波、位置确定、防护传感器的使用、AE数据的收集、AE数据分析和报告。 AE检查的目的是分析评估对象如何承受施加的载荷。 1.3 本指南的可能应用包括材料特性、生产过程的质量控制、制造后的验证测试、评估大型结构的感兴趣区域以及服务间隔后的重新测试。施加的载荷可包括机械力（张力、压缩力或扭转力）内压和热梯度。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 AE检查的目的是分析检查对象如何承受施加的载荷，或是否受到潜在损伤。因此，必须根据施加的负荷评估排放活动。 4.2 施加的载荷（在检查对象上）可能包括机械力（张力、压缩力或扭转力）、内部压力和热梯度。它可以是短到长、随机或循环的。所施加的载荷可以由检验员控制，或者可以作为过程的一部分已经存在。在任何一种情况下，所施加的载荷都与AE活动一起测量。 4.3 可能的应用包括确定零件完整性，对抽样或100 % 检验依据，制造过程中施加负载期间的过程中检验（例如，点焊、粘接、钎焊、压制等）。 )制造后的验证测试，监测结构的“关注区域”（或关注区域）（例如，桥梁接头或维修、容器、管道），以及服务间隔后的重新检查。

1.1 This guide covers techniques for conducting acoustic emission (AE) examinations of small parts. It is confined to examination objects (or defined regions of larger objects) where there is low AE signal attenuation throughout the examination region. This eliminates the consideration of complex attenuation factor corrections and multiple sensor and array placements based on overcoming signal losses over distances. 1.2 The guide assumes a typical AE examination as one where there is a controlled or measured stress acting upon the part being monitored by AE. Particular emphasis is placed on sensor and system selection, sensor placements, stressing considerations, noise reduction/rejection techniques, spatial filtering, location determination, use of guard sensors, collection of AE data, AE data analysis and report. The purpose of the AE examination is to analyze how an object under evaluation is withstanding the applied load. 1.3 Possible applications of this guide includes materials characterization, quality control of production processes, proof testing after fabrication, evaluating regions of interest of larger structures and retesting after intervals of service. The applied load may include mechanical forces (tension, compression or torsional) internal pressure and thermal gradients. 1.4 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. 1.5 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 The purpose of the AE examination is to analyze how an examination object is withstanding the applied load, or if it is suffering from some latent damage. Consequently the emission activity must be evaluated in relation to the applied load. 4.2 The applied load (on the examination object) may include mechanical forces (tension, compression or torsional), internal pressure and thermal gradients. It may be short to long, random or cyclic. The applied load may be controlled by the examiner or may already exist as part of the process. In either case the applied load is measured along with the AE activity. 4.3 Possible applications include the determination of part integrity, quality control assessment of production processes on a sampled or 100 % inspection basis, in-process examination during a period of applied load of a fabrication process (for example, spot welding, bonding, soldering, pressing, etc.), proof-testing after fabrication, monitoring a “region of interest” (or concern) of a structure (for example, bridge joint or repair, vessel, pipe), and re–examination after intervals of service.