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On-line high-accuracy particulate matter monitoring technology using multi-channel scattering signals
Optics Express ( IF 3.8 ) Pub Date : 2021-11-30 , DOI: 10.1364/oe.435894
Jin Zeng , Ang Chen , Ang Bian , Wenbo Xu , Liangbo Li , Deming Liu , Shu Wang , Tian Deng

Particulate matter has adverse effects on the environment and human health, thus emission monitoring of particulate matter is essential for environment and human health protection. Optical methods are popular for on-line particulate matter emission monitoring due to their low cost, high sensitivity and easy maintainability. However, the measurement accuracy is susceptible to the particle size distribution of the particulate matter. To resolve this problem, a new optical method using multi-channel scattering signals and a proof-of-concept prototype sensor are proposed in this paper. According to multi-channel scattering signals, which reflect the change of particle size distribution, the prototype sensor adaptively sets the mass scattering coefficient to improve the mass concentration measurement accuracy. Compared with the state-of-the-art optical technologies, simulation results show that the relative standard deviation was reduced from 242% to 4% by our method. In the tests of our prototype sensor, the maximum relative measurement errors are 10% for di-ethylhexyl-sebacat (DEHS) monodisperse aerosols and 11% for coal smoke. Given that it is low cost, highly sensitive and easy to maintain, the new method has significant potential for precise measurement of particulate matter in mobile or stationary pollution monitoring applications.

中文翻译:

多通道散射信号在线高精度颗粒物监测技术

颗粒物对环境和人类健康有不利影响,因此颗粒物排放监测对于保护环境和人类健康至关重要。光学方法因其低成本、高灵敏度和易维护性而广泛用于在线颗粒物排放监测。然而,测量精度易受颗粒物粒度分布的影响。为了解决这个问题,本文提出了一种使用多通道散射信号的新光学方法和概念验证原型传感器。原型传感器根据反映粒度分布变化的多通道散射信号,自适应设置质量散射系数,提高质量浓度测量精度。与最先进的光学技术相比,仿真结果表明,我们的方法将相对标准偏差从 242% 降低到 4%。在我们原型传感器的测试中,二乙基己基癸二酸 (DEHS) 单分散气溶胶的最大相对测量误差为 10%,煤烟的最大相对测量误差为 11%。鉴于其成本低、灵敏度高且易于维护,这种新方法在移动或固定污染监测应用中精确测量颗粒物方面具有巨大潜力。
更新日期:2021-12-06
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