1.1 本规程用于常规检查声发射（AE）传感器的灵敏度。其目的是提供一种可靠、精确的指定方式，用于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 本规程中的程序不是“校准”，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 本实践并不旨在推荐一个传感器制造商而不是另一个，也不意味着在使用本程序时，一种类型的传感器会做出不同的反应。 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和健康实践，并确定监管限制的适用性。 ====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，因此本规程要求在应用本规程之前，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，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 获取传感器随时间退化的早期警报。 3.5.4 获得匹配的传感器和前置放大器集。 3.5.5 在现场快速准确地验证传感器，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 and health practices and determine the applicability of regulatory limitations prior to use. ====== 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.