1.1 本规程描述了一种被动方法，用于检测和定位加压系统中气体和液体泄漏的稳态源。该方法采用表面安装的声发射传感器（对于非接触传感器，请参阅测试方法 E1002 )，或通过声波导连接到系统的传感器（有关更多信息，请参阅术语 E1316 )，并可用于管道和压力容器系统的连续运行监测和水压试验监测。虽然可以获得的值取决于传感器间距、背景噪声级、系统压力和泄漏类型，但可以实现高灵敏度。 1.2 单位- 以国际单位制或英寸-磅单位表示的数值应视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致- 符合标准。 1.3 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和健康实践，并确定监管限制的适用性。 1.4 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 加压系统中的气体或液体泄漏，无论是通过裂缝、孔口、密封破裂或其他开口，都可能涉及湍流或空化流，从而在外部大气和系统压力边界中产生声能。 通过使用合适的声发射传感器，可以在一定距离处检测通过压力边界传输的声能。 4.2 通过正确选择通频带，可以通过消除背景噪声来最大限度地提高对泄漏信号的灵敏度。在低频（通常低于100 kHz）下，泄漏可能激发结构内的机械共振，从而增强用于检测泄漏的声学信号。 4.3 本规程无意提供泄漏率的定量测量。

1.1 This practice describes a passive method for detecting and locating the steady state source of gas and liquid leaking out of a pressurized system. The method employs surface-mounted acoustic emission sensors (for non-contact sensors see Test Method E1002 ), or sensors attached to the system via acoustic waveguides (for additional information, see Terminology E1316 ), and may be used for continuous in-service monitoring and hydrotest monitoring of piping and pressure vessel systems. High sensitivities may be achieved, although the values obtainable depend on sensor spacing, background noise level, system pressure, and type of leak. 1.2 Units— The values stated in either SI units or inch-pound units are to be regarded as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standards. 1.3 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 and health practices and determine the applicability of regulatory limitations prior to use. 1.4 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 Leakage of gas or liquid from a pressurized system, whether through a crack, orifice, seal break, or other opening, may involve turbulent or cavitational flow, which generates acoustic energy in both the external atmosphere and the system pressure boundary. Acoustic energy transmitted through the pressure boundary can be detected at a distance by using a suitable acoustic emission sensor. 4.2 With proper selection of frequency passband, sensitivity to leak signals can be maximized by eliminating background noise. At low frequencies, generally below 100 kHz, it is possible for a leak to excite mechanical resonances within the structure that may enhance the acoustic signals used to detect leakage. 4.3 This practice is not intended to provide a quantitative measure of leak rates.