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、精确指定的方法来比较一组传感器或判断单个传感器的灵敏度在其使用寿命期间是否下降，或两者兼而有之。 1.2 本规程中的程序不是“校准”，也不提供频率响应信息。 1.3 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4 这种做法并不意味着推荐一家传感器制造商而不是另一家，也不意味着在使用该程序时，一种类型的传感器会与另一种不同。 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）。本标准的使用者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》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 3.1 由于跌落、安装在测试结构上时的机械冲击、温度循环等原因，可能会导致传感器性能下降。有必要也希望有一个简单的测量程序，在保持所有其他变量不变的同时，检查传感器响应的一致性。 3.2 尽管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合适的声学性能、实用方便、易于采购和低成本的最佳全方位组合。 3.3 由于已知丙烯酸棒的声学特性取决于温度，因此在应用该实践之前，该实践要求将棒、传感器和耦合剂稳定在相同的工作温度下。 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寒冷或炎热的环境中过夜。 3.5 正确应用并保存适当的记录，这种做法可以以多种方式使用，例如: 3.5.1 确定传感器何时不再适合使用。 3.5.2 检查暴露在高风险条件下的传感器，如跌落、过热等。 3.5.3 获得传感器随时间退化的早期警告。 3.5.4 获得匹配的传感器和前置放大器。 3.5.5 在现场快速而准确地验证传感器，并在通道未通过性能检查时协助故障排除。

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 The procedure in this practice is not a “calibration” and does not give frequency-response information. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 This practice does not purport to recommend one sensor manufacturer over another nor does it imply that one type of sensor will react differently from another when using this procedure. 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 ====== 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 application of the practice. 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, such as: 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. 3.5.4 To obtain matched sets of sensors and preamplifiers. 3.5.5 To verify sensors quickly but accurately in the field, and to assist troubleshooting when a channel does not pass a performance check.