A PULSED CONDENSATION PARTICLE COUNTER FOR LOW-COST MONITORING OF ULTRAFINE AIRBORNE PARTICLES

用于低成本监测空气中超细颗粒的脉冲凝结粒子计数器

• 批准号: 9908979
• 负责人: Susanne Vera Hering
• 金额: $ 18.1万
• 依托单位: AEROSOL DYNAMICS, INC.
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-04-01 至 2021-10-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9908979
• 关键词: Address; Aerosols; Affect; Air; Area; Cell Volumes; Cells; Cities; Communities; Data; Detection; Devices; Electronics; Exhibits; Growth; Health; Heating; Humidifier; Humidity; Individual; Industrialization; Laboratories; Measurement; Measures; Methods; Modeling; Modernization; Monitor; National Institute of Environmental Health Sciences; Optics; Performance; Phase; Physical condensation; Physiologic pulse; Price; Reporting; Research; Risk; Schools; Source; System; Testing; Travel; Ultrafine; Weight; air sampling; atmospheric aerosols; base; citizen science; cost; cost efficient; design; experimental study; innovation; instrument; light scattering; novel strategies; optical sensor; particle; particle counter; portability; sensor; tool; ultrafine particle; water vapor

A PULSED CONDENSATION PARTICLE COUNTER FOR LOW-COST MONITORING OF ULTRAFINE AIRBORNE PARTICLES ABSTRACT This project will design, develop and validate a new approach for monitoring the number concentration of fine and ultrafine airborne particles. Ultrafine particles are specifically implicated in health, and yet are not detected by currently-used low-cost sensors. Our approach is a Pulsed Condensation Particle Counter which uses adiabatic expansion combined with single particle counting. With modern optical sensors, single particle counting is quite feasible, and is more precise than the ensemble measurements of prior automated adiabatic counters. Our analysis shows that our new method should be much more energy-efficient than the laminar flow condensation methods now used, as no heating or cooling of the components is required. Our target is an affordable ($<3000), portable instrument that measures the particle number concentration with known accuracy and precision, and that bridges the gap in between the low-cost “citizen science” devices and research-grade instruments. This Phase I project will assess the feasibility of our concept as a low-cost sensor through modeling and experiment. It addresses the critical method components, namely system sizing, expansion rate, humidification and optical detection. Numerical modeling will examine the saturation ratio resulting from expansion in the presence of heat and water vapor transport from the walls, and how this varies with the aspect ratio of the expansion volume. This modeling will guide the design of critical components, which will then be built and tested with laboratory aerosols of known size and composition. The project will examine cost-efficient means of optical detection of the condensationally enlarged particles, including coincidence corrections. These components will be tested using existing electronics, and these experimental data will provide a basis for estimating the accuracy, precision, size, weight, power use and cost of a fully packaged system.

脉冲凝聚粒子计数器 空气中超细颗粒物的低成本监测 摘要 该项目将设计、开发和验证一种新的方法，用于监测 空气中的细小和超细颗粒。超细颗粒特别涉及健康，然而， 不能被当前使用的低成本传感器检测到。我们的方法是脉冲凝聚粒子 采用绝热膨胀与单粒子计数相结合的计数器。现代光学 传感器，单粒子计数是非常可行的，并且比集合测量更精确 现有的自动绝热计数器。我们的分析表明，我们的新方法应该更多 比现在使用的层流冷凝方法更节能，因为没有加热或冷却 组件是必需的。我们的目标是一个负担得起的（$<3000），便携式仪器，测量 以已知的准确度和精确度测量颗粒数浓度，并弥合两者之间的差距 低成本的“公民科学”设备和研究级仪器。 该第一阶段项目将通过建模和分析评估我们的概念作为低成本传感器的可行性。 实验它解决了关键的方法组成部分，即系统规模，膨胀率， 加湿和光学检测。数值建模将检查由以下因素产生的饱和比 膨胀的存在下的热量和水蒸气运输的墙壁，以及这是如何变化的， 膨胀体积的纵横比。这种建模将指导关键组件的设计， 然后将建造并测试已知大小和成分的实验室气溶胶。该项目将 检查光学检测冷凝放大颗粒的成本效益方法，包括 重合校正这些组件将使用现有的电子设备进行测试， 实验数据将为估计准确度、精度、尺寸、重量、功率使用和 一个完整的包装系统的成本。