本欧洲标准描述了一种用于测量表示道路噪声降低装置的声音反射的固有特性的量的测试方法:反射指数。 测试方法适用于以下应用: - 确定要沿道路安装的降噪装置的声音反射的固有特性，在道路或相关样品部分的典型装置上进行测量; - 确定实际使用中降噪装置的声反射的原位固有特性; - 施工完成后设计规格与实际性能数据的比较; - 验证降噪装置的长期性能（重复应用该方法）。 测试方法不适用于以下应用: - 确定要安装在混响条件下的降噪装置的声音反射的固有特性。内隧道或深沟。 在100Hz和5kHz之间的三分之一倍频带中，结果表示为频率的函数。如果不能在所指示的整个频率范围内获得有效的测量结果，则结果应在限制中给出

This European Standard describes a test method for measuring a quantity representative of the intrinsic characteristics of sound reflection from road noise reducing devices: the reflection index. The test method is intended for the following applications: - determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed along roads, to be measured either on typical installations alongside roads or on a relevant sample section; - determination of the in situ intrinsic characteristics of sound reflection of noise reducing devices in actual use; - comparison of design specifications with actual performance data after the completion of the construction work; - verification of the long-term performance of noise reducing devices (with a repeated application of the method). The test method is not intended for the following applications: - determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches. Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in a restricted frequency range and the reasons of the restriction(s) shall be clearly reported.