EQUIPMENT: Aerodynamic Particle Sizer for Industrial Air Quality Sampling

工业空气质量越来越重要，因为制造过程产生的气溶胶废物流对健康构成重大危害。 这些空气中的颗粒物大部分可归因于切削液雾。 在没有切削液的情况下（即，干式加工），在加工过程中可能产生灰尘颗粒并在空气中传播。 吸入这些固体颗粒可能比雾滴对健康造成更大的危害。 对工人暴露于空气中颗粒物的担忧促使几个组织进行了监管审查。 基于数量、表面积和质量的颗粒浓度是工程目的以及评估健康影响的重要指标。 与该项目有关的设备是一台空气动力学粒度仪，它根据每一个指标提供测量结果，从而提供被采样气溶胶所有重要特性的完整概况。 该设备（测量0.5至20微米之间的颗粒）与扫描迁移率粒度仪（测量小于0.5微米的颗粒）结合使用，将提供可能对人类健康产生不利影响的颗粒尺寸的时间和空间行为的完整图片。 使用光谱仪（和粒度仪）的计划强调了影响加工中气溶胶形成的主要机制的表征。 该项目的最终目标是开发和验证理论气溶胶形成模型，这可能会导致加工工艺的重新设计，最大限度地减少气溶胶的形成，从而消除或减少对昂贵的机器外壳和空气过滤器的需求。

Industrial air quality is of growing importance due to the fact that aerosol waste streams generated by manufacturing processes represent a significant health hazard. Much of this airborne particulate matter can be attributed to cutting fluid mists. In the absence of cutting fluid (i.e., dry machining), dust particles may be created during machining and become airborne. Inhalation of these solid particles may pose an even greater health hazard than mist droplets. The concern over worker exposure to airborne particulates has prompted regulatory scrutiny by several organizations. Particle concentrations based upon number, surface area, and mass are important metrics for engineering purposes as well as for assessing health impacts. The equipment associated with this project, an Aerodynamic Particle Sizer Spectrometer, provides measurements based on each of these metrics, thereby giving a complete profile of all important characteristics of the aerosol being sampled. This device (which measures particles between 0.5 and 20 microns), in conjunction with a Scanning Mobility Particle Sizer (which measures particles less than 0.5 microns), will provide a complete picture of temporal and spatial behavior of the particle sizes that can adversely affect human health. Plans for use of the Spectrometer (and Particle Sizer) emphasize the characterization of the dominant mechanisms that influence aerosol formation in machining. The ultimate goal of the project to develop and validate theoretical aerosol formation models may lead to machining process redesign that minimizes aerosol formation, thereby eliminating or reducing the need for costly machine enclosures and air filters.