本文選題：激光誘導(dǎo)擊穿光譜　切入點(diǎn)：等離子體　出處：《山西大學(xué)》2015年碩士論文

【摘要】：水泥質(zhì)量的優(yōu)劣直接影響到建筑工程的安全性,使用質(zhì)量合格的水泥材料是保證工程結(jié)構(gòu)質(zhì)量的必要前提。水泥質(zhì)量檢驗(yàn)是水泥生產(chǎn)中的一個(gè)重要的環(huán)節(jié),加強(qiáng)水泥質(zhì)量的檢驗(yàn)工作是保障水泥產(chǎn)品質(zhì)量的必要前提。傳統(tǒng)的水泥檢測(cè)方法存在耗時(shí)長(zhǎng)、操作繁瑣、有輻射等局限,不能及時(shí)反饋水泥生產(chǎn)過程中的原料配比,無法滿足現(xiàn)代水泥工業(yè)的時(shí)效性,迫切需要發(fā)展新的水泥質(zhì)量檢測(cè)技術(shù)。本文主要對(duì)激光誘導(dǎo)擊穿光譜用于水泥質(zhì)量檢測(cè)進(jìn)行了理論分析和實(shí)驗(yàn)研究,驗(yàn)證了該技術(shù)應(yīng)用于水泥質(zhì)量檢測(cè)的可行性,同時(shí)研制了基于激光誘導(dǎo)擊穿光譜技術(shù)的水泥質(zhì)量檢測(cè)設(shè)備。論文首先介紹了激光誘導(dǎo)等離子體的產(chǎn)生機(jī)制,論述了激光誘導(dǎo)擊穿光譜定量分析原理及等離子體參數(shù)測(cè)量原理。然后,針對(duì)目前等離子體溫度測(cè)量中某些元素不適于用Boltzmann平面法,及常用的Boltzmann平面法和雙線法的測(cè)量精度較差的問題,提出結(jié)合Boltzmann-Maxwell分布和Saha-Eggert公式來提高等離子溫度的測(cè)量精度；針對(duì)計(jì)算等離子體電子密度時(shí)譜線線寬不便測(cè)量的問題,利用高斯公式的面積與峰值關(guān)系建立了譜線線寬的簡(jiǎn)便算法；建立了基于Mcwhiter準(zhǔn)則的等離子體局部熱平衡LTE態(tài)的判定方法,為定量分析提供了有效光譜數(shù)據(jù)。接著,研制了基于激光誘導(dǎo)擊穿光譜的水泥質(zhì)量檢測(cè)設(shè)備,介紹了其結(jié)構(gòu)、光學(xué)系統(tǒng)、樣品室等設(shè)計(jì)原理。利用該設(shè)備對(duì)水泥生熟料中主量成分及熟料率值進(jìn)行了工業(yè)現(xiàn)場(chǎng)測(cè)試和分析,在定標(biāo)建模過程中,評(píng)估了不同種類的定標(biāo)樣品對(duì)定量分析精度的影響,發(fā)現(xiàn)為了獲得更高的測(cè)量精度,應(yīng)該選用與被測(cè)樣品同種類的樣品進(jìn)行單獨(dú)定標(biāo)；為了消除設(shè)備運(yùn)行過程中因激光能量衰減等因素而導(dǎo)致測(cè)量誤差的增大,提出一種快速線性校正方法,從而簡(jiǎn)化了設(shè)備的校正過程,延長(zhǎng)了標(biāo)定周期。實(shí)驗(yàn)結(jié)果表明,該LIBS設(shè)備對(duì)水泥生熟料中CaO、SiO2、Al2O3、Fe2O3測(cè)量的平均絕對(duì)誤差分別為0.46%、0.25%、0.13%、0.05%,對(duì)水泥熟料率值KH、SM、IM測(cè)量的平均絕對(duì)誤差分別為0.02、0.05和0.04,滿足國家標(biāo)準(zhǔn)要求。最后,對(duì)全文進(jìn)行了總結(jié),并對(duì)激光誘導(dǎo)擊穿光譜應(yīng)用于水泥質(zhì)量在線分析的進(jìn)一步研究工作提出了展望。本文的創(chuàng)新之處在于：1.結(jié)合Boltzmann-Maxwell分布和Saha-Eggert公式,提出了提高等離子體溫度測(cè)量精度的新方法；2.建立了基于Mcwhiter準(zhǔn)則的等離子體局部熱平衡LTE態(tài)的判定方法,為定量分析提供了有效光譜數(shù)據(jù)；3.提出了一種簡(jiǎn)便的線性校正方法,簡(jiǎn)化了LIBS設(shè)備的校正過程,延長(zhǎng)了標(biāo)定周期。
[Abstract]:The quality of cement directly affects the safety of construction projects, and the use of qualified cement materials is a necessary prerequisite to ensure the quality of engineering structures.Cement quality inspection is an important link in cement production.The traditional cement detection method has the limitation of long time consuming, complicated operation, radiation and so on. It can not feedback the raw material ratio in the cement production process in time, and can not satisfy the timeliness of the modern cement industry.It is urgent to develop new cement quality detection technology.In this paper, the theoretical analysis and experimental study of laser induced breakdown spectrum used in cement quality detection are carried out, and the feasibility of applying this technology to cement quality detection is verified.At the same time, a cement quality testing equipment based on laser induced breakdown spectroscopy is developed.Firstly, the mechanism of laser-induced plasma is introduced, the principle of laser induced breakdown spectrum quantitative analysis and the principle of plasma parameter measurement are discussed.Then, aiming at the problem that some elements in plasma temperature measurement are not suitable for Boltzmann plane method, and the measurement accuracy of Boltzmann plane method and two-line method are poor, a new method, Boltzmann-Maxwell distribution and Saha-Eggert formula, is proposed to improve the accuracy of plasma temperature measurement.In order to solve the problem of inconvenient measurement of line width when calculating plasma electron density, a simple algorithm of line width is established by using the relationship between area and peak value of Gao Si's formula.A method for determining the local thermal equilibrium LTE states of plasma based on Mcwhiter criterion is established, which provides effective spectral data for quantitative analysis.Then, the cement quality detection equipment based on laser induced breakdown spectrum is developed, and the design principle of its structure, optical system and sample chamber is introduced.The industrial field test and analysis of the principal component and clinker rate value of cement raw clinker were carried out by using this equipment. In the process of calibration modeling, the influence of different kinds of calibration samples on the quantitative analysis accuracy was evaluated.It is found that in order to obtain higher measurement accuracy, the same kind of sample should be selected to be calibrated separately, and in order to eliminate the increase of measurement error caused by laser energy attenuation and other factors during the operation of the equipment,A fast linear correction method is proposed, which simplifies the calibration process and prolongs the calibration period.Finally, the paper summarizes the whole paper, and puts forward the prospect of further research on the application of laser induced breakdown spectroscopy in the on-line analysis of cement quality.The innovation of this paper is that of 1: 1.Based on Boltzmann-Maxwell distribution and Saha-Eggert formula, a new method to improve the accuracy of plasma temperature measurement is proposed.A method for determining the local thermal equilibrium LTE states of plasma based on Mcwhiter criterion is established, which provides effective spectral data for quantitative analysis.A simple linear correction method is proposed, which simplifies the calibration process of LIBS equipment and prolongs the calibration period.
【學(xué)位授予單位】：山西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ172.66;TN249

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本文編號(hào)：1711410