1.1 本试验方法包括测定声速计/温度计的动态性能，该声速计/温度计采用声速或声速的反时限测量技术，或两者兼有。性能标准包括:( 一 )接受角度( b )声程长度( c )系统延迟( d )系统延迟不匹配( e )热稳定性范围( f )阴影校正( g )速度校准范围，以及( h )速度分辨率。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 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、健康和环境实践，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====== 5.1 本试验方法提供了一种标准方法，用于评估使用反时限解决方案测量风速分量和声速的声速计/温度计的性能。它提供了仪器性能标准的明确确定。该测试方法适用于制造商，用于描述其产品的性能，适用于仪表测试设施，用于验证仪表性能，适用于用户，用于指定性能要求。 声波路径长度程序也适用于数据采集之前的校准目的。操作声波风速计/温度计的程序在实践中描述 D5527 . 5.2 假设声速风速计/温度计阵列具有足够高的结构刚度和足够低的热膨胀系数，以在其设计工作范围内保持内部对准在制造商规范范围内。与制造商协商内部校准验证程序，并在继续使用本试验方法之前验证校准。 5.3 该测试方法旨在表征阵列模型或探头设计的性能。从单个阵列获得的传感器阴影数据适用于具有相同阵列模型或探头设计的所有仪器。一些非正交阵列可能不需要指定传感器阴影校正或速度校准范围。

1.1 This test method covers the determination of the dynamic performance of a sonic anemometer/thermometer which employs the inverse time measurement technique for velocity or speed of sound, or both. Performance criteria include: ( a ) acceptance angle, ( b ) acoustic pathlength, ( c ) system delay, ( d ) system delay mismatch, ( e ) thermal stability range, ( f ) shadow correction, ( g ) velocity calibration range, and ( h ) velocity resolution. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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, health, and environmental 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 ====== 5.1 This test method provides a standard method for evaluating the performance of sonic anemometer/thermometers that use inverse time solutions to measure wind velocity components and the speed of sound. It provides an unambiguous determination of instrument performance criteria. The test method is applicable to manufacturers for the purpose of describing the performance of their products, to instrumentation test facilities for the purpose of verifying instrument performance, and to users for specifying performance requirements. The acoustic pathlength procedure is also applicable for calibration purposes prior to data collection. Procedures for operating a sonic anemometer/thermometer are described in Practices D5527 . 5.2 The sonic anemometer/thermometer array is assumed to have a sufficiently high structural rigidity and a sufficiently low coefficient of thermal expansion to maintain an internal alignment to within the manufacturer's specifications over its designed operating range. Consult with the manufacturer for an internal alignment verification procedure and verify the alignment before proceeding with this test method. 5.3 This test method is designed to characterize the performance of an array model or probe design. Transducer shadow data obtained from a single array is applicable for all instruments having the same array model or probe design. Some non-orthogonal arrays may not require specification of transducer shadow corrections or the velocity calibration range.