1.1 本规程用于常规检查声发射（AE）传感器的灵敏度。它旨在提供一种可靠、精确的指定方式来比较一组传感器，或判断单个传感器的灵敏度是否在其使用寿命内下降，或两者兼而有之。 1.2 这种做法不是“校准”，也不提供频率响应信息。 1.3 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不符合标准。 1.4 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。 1.5 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《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====== 3.1 传感器性能可能会因跌落、安装在测试结构上时的机械冲击、温度循环等而降低。在保持所有其他变量不变的情况下，有必要并希望有一个简单的测量程序来检查传感器响应的一致性。 3.2 虽然许多不同类型的试块已用于此目的多年，但丙烯酸聚合物棒提供了适当声学性能、实用方便、易于采购和低成本的最佳全面组合。 3.3 由于已知丙烯酸棒的声学特性取决于温度，因此该实践要求在验证传感器之前，将棒、传感器和耦合剂稳定在相同的工作温度。 3.4 应注意丙烯酸聚合物棒的储存条件。例如，除非在使用前有时间稳定温度，否则不应将其放置在冰冻或高温环境中过夜。 3.5 正确应用并妥善保存记录，这种做法可以在许多方面使用。用户组织必须确定其使用的背景、验收标准以及根据导程中断结果采取的行动。建议使用以下用途: 3.5.1 确定传感器何时不再适合使用。 3.5.2 检查暴露在高电压下的传感器- 风险条件，如跌落、过热等。 3.5.3 获取传感器随时间退化的早期警报。这可以识别损坏传感器的使用条件，从而更好地维护设备并降低更换成本。 3.5.4 获得匹配的传感器、前置放大器、仪表通道或其组合，以实现整个系统更均匀的性能。 3.5.5 省时省钱，省去安装不良传感器。 3.5.6 在现场快速但一致地验证传感器，并在通道未通过性能检查时协助故障排除。 图1 丙烯酸棒说明 3.6 建议考虑上述所有用途。本实践的目的不是说明如何实现这些用途，而是说明如何执行测试本身，以便获得准确可靠的结果。

1.1 This practice is used for routinely checking the sensitivity of acoustic emission (AE) sensors. It is intended to provide a reliable, precisely specified way of comparing a set of sensors, or telling whether an individual sensor's sensitivity has degraded during its service life, or both. 1.2 This practice is not a “calibration” nor does it give frequency response information. 1.3 Units— The values stated in SI units or inch-pound units are to be regarded separately 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 standard. 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 ====== 3.1 Degradation in sensor performance can occur due to dropping, mechanical shock while mounted on the test structure, temperature cycles, and so forth. It is necessary and desirable to have a simple measurement procedure that will check the consistency of sensor response, while holding all other variables constant. 3.2 While test blocks of many different kinds have been used for this purpose for many years, an acrylic polymer rod offers the best all-around combination of suitable acoustic properties, practical convenience, ease of procurement and low cost. 3.3 Because the acoustic properties of the acrylic rod are known to depend on temperature, this practice requires that the rod, sensors, and couplant be stabilized at the same working temperature, prior to verifying the sensors. 3.4 Attention should be paid to storage conditions for the acrylic polymer rod. For example, it should not be left in a freezing or hot environment overnight, unless it is given time for temperature stabilization before use. 3.5 Properly applied and with proper record keeping, this practice can be used in many ways. The user organization must determine the context for its use, the acceptance standards and the actions to be taken based on the lead break results. The following uses are suggested: 3.5.1 To determine when a sensor is no longer suitable for use. 3.5.2 To check sensors that have been exposed to high-risk conditions, such as dropping, overheating, and so forth. 3.5.3 To get an early warning of sensor degradation over time. This can lead to identifying conditions of use, which are damaging sensors, and thus, to better equipment care and lower replacement costs. 3.5.4 To obtain matched sets of sensors, preamplifiers, instrumentation channels, or a combination thereof, for more uniform performance of the total system. 3.5.5 To save time and money, by eliminating the installation of bad sensors. 3.5.6 To verify sensors quickly but consistently in the field and to assist trouble-shooting when a channel does not pass a performance check. FIG. 1 Acrylic Rod Description 3.6 All the above uses are recommended for consideration. The purpose of this practice is not to call out how these uses are to be implemented, but only to state how the test itself is to be performed so that the results obtained will be accurate and reliable.