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Compact remote optical system for real time measurement of aerosol emissions

机译：紧凑的远程光学系统，用于实时测量气溶胶排放

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Demonstrating particle matter (PM) emissions compliance with environmental regulations is required for operation of any industrial, commercial or military facility. Emission sources are initially screened based on their visible opacity via US EPA Method 9 standard. Nowadays, it is rather surprising that opacity is still visually determined by human eyes with smoke school training and semi-annual certification. Nonetheless, opacity alone doesn't reveal particle concentration and size distribution which is crucial to determine PM values. It would be desirable to have an automated, calibratable device to make such a measurement with higher accuracy and reliability and is not available to date. We present our preliminary work on developing a compact, hand portable system capable of quantitatively determining plume optical opacity in combination with possible particle concentration and size distribution (and hence PM) measurement for standoff distances up to 150 meters. Our benchtop lidar-based system was built with a frequency-doubled Q-switched Nd:YAG laser and an optical receiver. We have demonstrated the feasibility of a remote-capable optical sensor system for real-time continuous monitoring of visible emission plumes and its effectiveness for quantitative opacity measurement. The hand-portable Remote Plume Particulate Matter (RPPM) meter being developed will be capable of determining opacity and PM load from remote PM sources will provide a regulatory compliance solution for visible emissions from sources for environmental studies, industrial and military applications.
机译：任何工业，商业或军事设施的运行都必须证明颗粒物（PM）排放符合环境法规。最初根据排放源的可见不透明度通过US EPA方法9标准对排放源进行筛选。如今，令人惊讶的是，通过烟熏学校培训和半年认证，人眼仍然可以从视觉上确定不透明度。但是，仅不透明度并不能显示出颗粒浓度和尺寸分布，这对于确定PM值至关重要。期望具有一种自动化的，可校准的设备以更高的精度和可靠性进行这种测量，并且迄今为止尚不可用。我们介绍了开发紧凑的手持系统的初步工作，该系统能够定量地确定羽流的不透明度，并结合可能的颗粒浓度和尺寸分布（从而测量PM）来测量长达150米的距离。我们基于台式激光雷达的系统由倍频调Q的Nd：YAG激光器和光接收器组成。我们已经证明了具有远程功能的光学传感器系统对可见光发射羽流进行实时连续监测的可行性及其对定量不透明度测量的有效性。正在开发的手动便携式远程羽状颗粒物（RPPM）仪将能够确定不透明性，远程PM源的PM负荷将为环境研究，工业和军事应用中的可见排放物提供合规解决方案。

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