The Ultrasonic Personal Aerosol Sampler (UPAS) is a small, lightweight, and quiet sampler that collects airborne particulate matter on a filter for gravimetric or compositional analysis. The objective of this work was to develop UPAS inlets with collection efficiencies that match criteria for respirable or thoracic mass sampling. The two-stage inlet for respirable mass described here utilizes an impaction stage and a cyclone, whereas the one-stage inlet for thoracic mass sampling utilizes a circular slot impactor. Inlet designs are based on particle collection theory used in conjunction with an optimization algorithm to predict initial inlet dimensions; these predictions were the starting points for experiments that finalized dimensions and operating conditions. Both the respirable mass inlet and the thoracic mass inlet described here are interchangeable with the UPAS, and both have efficiencies that match well with their respective standards. With either inlet, the collected sample should be within ±5% of what the standard specifies for aerosols with reasonably broad size distributions.

超声波个人气溶胶采样器（UPAS）是一种小型，轻巧且安静的采样器，可将空气中的颗粒物收集在过滤器上，用于重量分析或成分分析。这项工作的目的是开发具有与可呼吸或胸腔质量采样标准相匹配的采集效率的UPAS进样口。这里描述的可吸入物质的两级入口利用了一个撞击级和一个旋风分离器，而胸腔质量取样的一级入口则利用了一个圆形槽撞击器。入口设计基于粒子收集理论，结合优化算法来预测初始入口尺寸；这些预测是确定尺寸和运行条件的实验的起点。此处描述的可吸入质量入口和胸腔质量入口都可以与UPAS互换，并且两者的效率都与各自的标准非常匹配。无论使用哪个入口，收集的样品都应在标准规定的尺寸分布合理的气溶胶的±5％之内。