本文選題：激光粒子計(jì)數(shù)器 + Monte�。� 參考：《南京理工大學(xué)》2017年碩士論文

【摘要】：光散射式塵埃粒子計(jì)數(shù)器是監(jiān)測(cè)空氣中懸浮顆粒的重要光學(xué)傳感器,其粒徑分辨率很大程度上影響著測(cè)量結(jié)果的準(zhǔn)確性,其中最重要的影響因素是散射光收集系統(tǒng)的結(jié)構(gòu),本文從理論建模與實(shí)驗(yàn)驗(yàn)證的角度出發(fā),研究不同散射光收集系統(tǒng)結(jié)構(gòu)對(duì)粒徑分辨率影響,為激光粒子計(jì)數(shù)器的優(yōu)化提供了一種解決方案。本文以Monte Carlo隨機(jī)模型為基礎(chǔ),針對(duì)粒徑為0.3μm、0.4μm、0.5μm與0.6μm四種標(biāo)準(zhǔn)PSL粒子,建立單粒子Lorenz-Mie隨機(jī)散射模型。同時(shí)將散射收集系統(tǒng)簡(jiǎn)化為光電探測(cè)器、光敏區(qū)與反射鏡三個(gè)組成部分,對(duì)光電探測(cè)器光敏感面、光敏區(qū)進(jìn)行有限元?jiǎng)澐?推導(dǎo)計(jì)算空間光束反射坐標(biāo)變換,理論計(jì)算散射光信號(hào)幅度分布曲線與光子落點(diǎn)位置時(shí)間積分結(jié)果,同時(shí)理論上探討幅度呈對(duì)數(shù)正態(tài)分布的隨機(jī)噪聲模型的合理性,完成PartileCounter仿真軟件編寫;以信息熵為基礎(chǔ)建立信號(hào)分布的離散度與區(qū)分度評(píng)價(jià)體系,通過仿真計(jì)算比較球形反射鏡與橢球形反射鏡對(duì)粒徑分辨率的影響,同時(shí)尋找光電探測(cè)器最佳位置。實(shí)驗(yàn)上,對(duì)兩臺(tái)改進(jìn)型粒子計(jì)數(shù)器與原有LM1612Ag型粒子計(jì)數(shù)器進(jìn)行四種標(biāo)準(zhǔn)粒子的標(biāo)定實(shí)驗(yàn),獲取實(shí)際信號(hào)幅度分布結(jié)果,驗(yàn)證理論模型的合理性,證明當(dāng)探測(cè)器距球心4.5mm時(shí)粒徑分辨率達(dá)92.6%,比原有結(jié)構(gòu)粒徑分辨率有較大提升,遠(yuǎn)超國(guó)標(biāo)規(guī)定的70%。本文研究工作為散射光收集系統(tǒng)的優(yōu)化提供了新的解決思路,為粒徑分辨率的提升提供了理論依據(jù)。
[Abstract]:The light scattering dust particle counter is an important optical sensor for monitoring suspended particles in the air. The resolution of particle size greatly affects the accuracy of the measurement results. The most important factor is the structure of the scattering light collection system. In this paper, from the point of view of theoretical modeling and experimental verification, the influence of different light collection system structures on particle resolution is studied, which provides a solution for the optimization of laser particle counter. Based on the Monte Carlo stochastic model, a single particle Lorenz-Mie random scattering model is established for four standard PSL particles of 0. 3 渭 m ~ 0. 4 渭 m ~ 0. 5 渭 m and 0. 6 渭 m. At the same time, the scattering collection system is simplified into three parts: photodetector, Guang Min region and reflector. The photo-sensitive surface and Guang Min region of photodetector are divided by finite element method, and the spatial beam reflection coordinate transformation is deduced and calculated. At the same time, the rationality of random noise model with logarithmic normal distribution of amplitude is discussed theoretically, and the PartileCounter simulation software is written. Based on information entropy, an evaluation system of dispersion and differentiation of signal distribution is established. The influence of spherical mirror and ellipsoidal mirror on particle size resolution is compared by simulation, and the optimum position of photodetector is found at the same time. In the experiment, two modified particle counters and the original LM1612Ag particle counter were calibrated by four kinds of standard particles, the results of the actual signal amplitude distribution were obtained, and the rationality of the theoretical model was verified. It is proved that the particle size resolution of the detector is 92.6when the detector is away from the spherical center 4.5mm, which is much higher than that of the original structure, which far exceeds the 70th specified in the national standard. The research work in this paper provides a new solution for the optimization of scattering light collection system, and provides a theoretical basis for improving the resolution of particle size.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH744.5

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