利用光散射法及蓝牙技术的PM2.5信号采集与传输终端

发布时间：2018-03-14 08:34

本文选题：PM2.5　切入点：蒙特卡罗方法　出处：《浙江工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着科学技术的发展以及人民生活水平的提高,大气中PM2.5(可吸入性颗粒)的含量日益成为人们关注的焦点。为了能实时便利地对周围环境中的PM2.5进行监测,同时降低系统成本和功耗、减小其体积,本文从光散射的理论出发设计了一套便携式、带蓝牙收发模块的PM2.5检测系统。主要进行的研究工作如下:一、从光散射理论出发,通过Mie理论递推公式计算散射相位函数,利用蒙特卡罗方法模拟光子在大气中的散射情况。重点研究了波长为350-750 nm时水平线偏振光、45°线偏振光、右旋圆偏振光三种情况下入射到大气时,出射面的散射光偏振度的变化情况;对偏振光穿过粒径1000-1500 nm的气溶胶时,其出射面偏振度变化情况也进行了分析;以香烟烟雾模拟气溶胶环境,在460 nm和556 nm两种入射波长条件下研究偏振光经过不同烟雾环境的传输变化情况。理论与实验结果表明:对于不同质量浓度的烟雾,入射光为水平线偏振光时其出射面散射光的偏振特性基本不改变;入射光为右旋偏振光和45°线偏振光时出射光的退偏程度随烟雾质量浓度的增加而增加。这些理论和实验结果为利用光散射法检测大气中PM2.5的浓度提供了理论基础。二、本课题采用基于日本夏普公司的GP2Y1010AUOF传感器和BM77蓝牙模块,以STM32F103V BT6作为主控芯片研究PM2.5检测技术。设计融合了光散射传感器、蓝牙通讯和智能终端三者的优势,把传统PM2.5检测仪系统结构分为信号采集单元和信号显示单元。信号采集单元通过蓝牙技术来进行通信,实现PM2.5数据的传输;信号显示单元采用随身携带的智能终端(智能手机或平板电脑)来实现,用智能终端来进行信号显示及处理。不仅极大地降低了仪器成本、减小了仪器体积仪器功耗,还具有强大的数据处理能力。而且融合网络技术的智能终端还可以实现数据的实时共享,有利于各地PM2.5浓度大数据的建立。
[Abstract]:With the development of science and technology and the improvement of people's living standard, the content of PM2.5 (inhalable particles) in the atmosphere has become the focus of attention. In order to monitor the PM2.5 in the surrounding environment in real time and conveniently, At the same time, the cost and power consumption of the system are reduced and its volume is reduced. In this paper, a portable PM2.5 detection system with Bluetooth transceiver module is designed based on the theory of light scattering. The main research work is as follows: first, starting from the theory of light scattering, The scattering phase function is calculated by using the recursive formula of Mie theory, and the scattering of photons in the atmosphere is simulated by Monte Carlo method. The 45 掳polarized light of horizontal line at wavelength of 350-750 nm is studied emphatically. When the right-handed circular polarized light is incident into the atmosphere, the degree of polarization of the scattering light on the exit surface is changed, and the polarization degree of the emitting surface is also analyzed when the polarized light passes through the aerosol with the diameter of 1000-1500 nm. Using cigarette smoke to simulate aerosol environment, the transport variation of polarized light through different smoke environments was studied at 460nm and 556nm incident wavelengths. The theoretical and experimental results show that: for smog with different mass concentrations, When the incident light is a horizontal polarized light, the polarization characteristics of the scattering light on the surface are basically unchanged. The degree of depolarization increases with the increase of smoke mass concentration when the incident light is right-handed polarized light and 45 掳line polarized light. These theoretical and experimental results provide a theoretical basis for the detection of PM2.5 concentration in the atmosphere by light scattering method. Based on GP2Y1010AUOF sensor and BM77 Bluetooth module of Sharp Company of Japan, PM2.5 detection technology is studied with STM32F103V BT6 as main control chip. The advantages of light scattering sensor, Bluetooth communication and intelligent terminal are designed and integrated. The system structure of traditional PM2.5 detector is divided into signal acquisition unit and signal display unit. The signal acquisition unit communicates through Bluetooth technology to realize the transmission of PM2.5 data. The signal display unit is realized by the portable intelligent terminal (smart phone or tablet computer), and the intelligent terminal is used to display and process the signal. It not only greatly reduces the cost of the instrument, but also reduces the power consumption of the instrument volume. It also has powerful data processing ability, and the intelligent terminal with network technology can realize the real-time sharing of data, which is beneficial to the establishment of big data of PM2.5 concentration in various places.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X831;O436;TN925

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