本文選題：粒度檢測 + Mie散射理論��； 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：目前,石英砂粒度檢測采用人工篩分法或比表面積法,這兩種方法測量精度差、耗時長、成本高、無法及時跟蹤產(chǎn)品質(zhì)量,導(dǎo)致生產(chǎn)中無法自動調(diào)整分級設(shè)備工作參數(shù)、生產(chǎn)效率低。為了解決上述問題,對石英砂濕法生產(chǎn)中粒度檢測技術(shù)和系統(tǒng)進行研究。根據(jù)石英砂濕法生產(chǎn)要求,重點探究了Mie散射理論的應(yīng)用難點反演算法。獨立模式反演算法抗干擾能力差、多峰適應(yīng)性弱,基于該算法的粒度檢測系統(tǒng)性能受到很大限制。通過對病態(tài)方程反問題研究發(fā)現(xiàn),采用不同正則算子可改善P-T法性能,運用與散射角有關(guān)的預(yù)處理技術(shù)可提高反演算法的穩(wěn)定性和噪聲適應(yīng)能力。在反演算法改進的基礎(chǔ)上,設(shè)計了一種基于Mie散射理論的石英砂粒度檢測系統(tǒng)。該系統(tǒng)分為信號產(chǎn)生和采集模塊、信號處理模塊、數(shù)據(jù)處理和顯示模塊。信號產(chǎn)生和采集模塊包括激光器、擴束準(zhǔn)直器、樣品池、傅立葉透鏡和CCD相機,該模塊利用擴束準(zhǔn)直器提高激光束的平行性、濾除高頻分量、減小艾里斑尺寸、增大檢測上限;確定了傅立葉透鏡參數(shù)選擇公式,根據(jù)待測粒度范圍和光源光斑尺寸即可直接選取透鏡;采用CCD相機代替硅光二極管陣列實現(xiàn)光電轉(zhuǎn)換,降低了系統(tǒng)維護難度、提高了系統(tǒng)穩(wěn)定性、減小了成本。信號處理模塊利用圖像分環(huán)和灰度處理方式得到散射光強曲線,并對該曲線做了平滑處理。數(shù)據(jù)處理和顯示模塊根據(jù)提出改進的反演算法編程實現(xiàn),并將檢測的粒度分布結(jié)果圖形化輸出。通過仿真分析,改進的反演算法兼顧了光能殘差和平滑程度,提升了抗噪聲能力。通過搭建的實驗系統(tǒng)測試,設(shè)計的基于改進反演算法的石英砂粒度檢測系統(tǒng)達(dá)到了技術(shù)要求。
[Abstract]:At present, the particle size of quartz sand is detected by artificial sieving method or specific surface area method. These two methods have poor measuring accuracy, long time consumption, high cost, and can not track the product quality in time, resulting in the inability to automatically adjust the working parameters of the classifying equipment in production. The production efficiency is low. In order to solve the above problems, the technology and system of particle size detection in quartz sand wet production were studied. According to the requirement of quartz sand wet production, the difficult inversion algorithm of Mie scattering theory is studied. The independent mode inversion algorithm has poor anti-jamming ability and weak multi-peak adaptability, so the performance of the granularity detection system based on the algorithm is greatly limited. By studying the inverse problem of ill-conditioned equation, it is found that the performance of P-T method can be improved by using different canonical operators, and the stability and noise adaptability of inversion algorithm can be improved by using preprocessing technique related to scattering angle. Based on the improvement of inversion algorithm, a quartz sand particle size detection system based on Mie scattering theory is designed. The system is divided into signal generation and acquisition module, signal processing module, data processing and display module. The signal generation and acquisition module includes laser, beam expanding collimator, sample cell, Fourier lens and CCD camera. The module uses beam expanding collimator to improve the parallelism of laser beam, filter out the high frequency component, reduce the size of Allie spot, and increase the detection upper limit. The parameter selection formula of Fourier lens is determined, the lens can be directly selected according to the range of particle size to be measured and the size of light spot of light source, the photoelectric conversion is realized by using CCD camera instead of silicon photodiode array, and the system maintenance difficulty is reduced. The system stability is improved and the cost is reduced. In the signal processing module, the scattering intensity curve is obtained by using image ring splitting and gray processing, and the curve is smoothed. The data processing and display module is programmed according to the improved inversion algorithm and the results of the granularity distribution are graphically outputted. Through simulation analysis, the improved inversion algorithm takes into account the light energy residuals and smoothness, and improves the anti-noise ability. The quartz sand granularity detection system based on the improved inversion algorithm has met the technical requirements.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD985

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