本文選題：PM2.5　切入點(diǎn)：蒙特卡羅方法　出處：《浙江工業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著科學(xué)技術(shù)的發(fā)展以及人民生活水平的提高,大氣中PM2.5(可吸入性顆粒)的含量日益成為人們關(guān)注的焦點(diǎn)。為了能實(shí)時(shí)便利地對(duì)周圍環(huán)境中的PM2.5進(jìn)行監(jiān)測(cè),同時(shí)降低系統(tǒng)成本和功耗、減小其體積,本文從光散射的理論出發(fā)設(shè)計(jì)了一套便攜式、帶藍(lán)牙收發(fā)模塊的PM2.5檢測(cè)系統(tǒng)。主要進(jìn)行的研究工作如下:一、從光散射理論出發(fā),通過Mie理論遞推公式計(jì)算散射相位函數(shù),利用蒙特卡羅方法模擬光子在大氣中的散射情況。重點(diǎn)研究了波長(zhǎng)為350-750 nm時(shí)水平線偏振光、45°線偏振光、右旋圓偏振光三種情況下入射到大氣時(shí),出射面的散射光偏振度的變化情況;對(duì)偏振光穿過粒徑1000-1500 nm的氣溶膠時(shí),其出射面偏振度變化情況也進(jìn)行了分析;以香煙煙霧模擬氣溶膠環(huán)境,在460 nm和556 nm兩種入射波長(zhǎng)條件下研究偏振光經(jīng)過不同煙霧環(huán)境的傳輸變化情況。理論與實(shí)驗(yàn)結(jié)果表明:對(duì)于不同質(zhì)量濃度的煙霧,入射光為水平線偏振光時(shí)其出射面散射光的偏振特性基本不改變;入射光為右旋偏振光和45°線偏振光時(shí)出射光的退偏程度隨煙霧質(zhì)量濃度的增加而增加。這些理論和實(shí)驗(yàn)結(jié)果為利用光散射法檢測(cè)大氣中PM2.5的濃度提供了理論基礎(chǔ)。二、本課題采用基于日本夏普公司的GP2Y1010AUOF傳感器和BM77藍(lán)牙模塊,以STM32F103V BT6作為主控芯片研究PM2.5檢測(cè)技術(shù)。設(shè)計(jì)融合了光散射傳感器、藍(lán)牙通訊和智能終端三者的優(yōu)勢(shì),把傳統(tǒng)PM2.5檢測(cè)儀系統(tǒng)結(jié)構(gòu)分為信號(hào)采集單元和信號(hào)顯示單元。信號(hào)采集單元通過藍(lán)牙技術(shù)來進(jìn)行通信,實(shí)現(xiàn)PM2.5數(shù)據(jù)的傳輸;信號(hào)顯示單元采用隨身攜帶的智能終端(智能手機(jī)或平板電腦)來實(shí)現(xiàn),用智能終端來進(jìn)行信號(hào)顯示及處理。不僅極大地降低了儀器成本、減小了儀器體積儀器功耗,還具有強(qiáng)大的數(shù)據(jù)處理能力。而且融合網(wǎng)絡(luò)技術(shù)的智能終端還可以實(shí)現(xiàn)數(shù)據(jù)的實(shí)時(shí)共享,有利于各地PM2.5濃度大數(shù)據(jù)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 擄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 擄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.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X831;O436;TN925

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