1.1 本试验方法的目的是获得表征液体颗粒或液滴尺寸的数据，例如喷嘴或类似装置在指定条件下使用指定液体产生的颗粒或液滴。液滴的尺寸范围通常为5μm至1 000-μm直径；它们会以喷雾的形式出现，喷雾可能小到几立方厘米，也可能大到几立方米。通常，粒子的数量密度可能会因点而异。 1.2 本试验方法主要用于标准化喷雾装置性能的测量。它仅限于通过将光束穿过喷雾并分析液滴散射的光来获得尺寸信息的技术和仪器。 这种技术不会产生单个液滴的图像，因此被称为“光学（非成像）仪器” 1.3 当涉及被采样的整个喷雾时，所进行的测量可能是通量敏感的或空间的，如实践中所定义 E799 ，取决于特定仪器使用的技术。 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====== 5.1 本试验方法的目的是提供喷雾液滴尺寸特性的数据，如光学非成像光散射仪器所示。获得的结果通常是统计性质的。液体喷雾生产中涉及的变量数量，以及不同仪器中使用的各种光学、电子和采样系统，可能会导致测试结果的变化。因此，在试图比较通过不同方法获得的样本数据时，必须小心。

1.1 The purpose of this test method is to obtain data which characterize the sizes of liquid particles or drops such as are produced by a spray nozzle or similar device under specified conditions using a specified liquid. The drops will generally be in the size range from 5-μm to the order of 1 000-μm diameter; they will occur in sprays which may be as small as a few cubic centimetres or as large as several cubic metres. Typically the number density of the particles can vary significantly from one point to another. 1.2 This test method is intended primarily for use in standardizing measurements of the performance of sprayproducing devices. It is limited to those techniques and instruments that operate by passing a beam of light through the spray and analyzing the light scattered by the droplets to derive size information. Such techniques do not produce images of individual drops, and therefore, are known as “optical (nonimaging) instruments.” 1.3 The measurements made, when referred to the entire spray being sampled, may be flux sensitive or spatial, as defined in Practice E799 , depending on the techniques used with a particular instrument. 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 ====== 5.1 The purpose of this test method is to provide data on liquid drop-size characteristics for sprays, as indicated by optical nonimaging light-scattering instruments. The results obtained generally will be statistical in nature. The number of variables concerned in the production of liquid spray, together with the variety of optical, electronic, and sampling systems used in different instruments, may contribute to variations in the test results. Care must be exercised, therefore, when attempting to compare data from samples obtained by different means.