本文選題：波長調(diào)制光譜　切入點：吸收光譜　出處：《北京交通大學》2017年碩士論文

【摘要】：波長調(diào)制技術(shù)(WMS)是現(xiàn)代氣體痕量檢測的重要手段之一,但在波長調(diào)制技術(shù)中,氣體濃度的反演需要測量出無吸收時波長掃描的激光強度起伏、強度調(diào)制響應(yīng)、掃描波長變化以及電流調(diào)制波長響應(yīng)等來模擬出WMS光譜線型。其中電流調(diào)制波長響應(yīng)信號的模擬,大大增加了技術(shù)的復(fù)雜性。截止目前,半導(dǎo)體激光的波長調(diào)制響應(yīng)信號獲得的方法均需要通過參數(shù)擬合,為了解決這一問題,實現(xiàn)零擬合參數(shù),提出了基于掃描電流波長函數(shù)來確定電流調(diào)制波長響應(yīng)函數(shù)的方法,本論文的主要工作如下:(1)在WMS技術(shù)的基礎(chǔ)上,提出并發(fā)展了一種基于掃描電流波長函數(shù)確定DFB激光電流調(diào)制波長響應(yīng)(CMWR)的方法,實現(xiàn)了 CMWR信號的免測量。通過將本文這種方法的結(jié)果與傳統(tǒng)的三種方法的結(jié)果進行比較,驗證了本文所提方法的準確性與精確性。其優(yōu)勢有:1)避免了常數(shù)法,一階導(dǎo)數(shù)法和2f法過程對參數(shù)的擬合,實現(xiàn)了對波長調(diào)制響應(yīng)信號的免測量,達到了零擬合參數(shù)的目標;2)對CMWR的描述精度高于常數(shù)法和一階導(dǎo)數(shù)法,減小測量過程的復(fù)雜程度,簡化了實驗操作過程;3)可用于免定標測量法。(2)設(shè)計并搭建免定標波長調(diào)制光譜測量(CF-WMS)實驗系統(tǒng)平臺,將CMWR信號獲取的新方法應(yīng)用到免定標波長調(diào)制光譜測量技術(shù)中,并且使用Labview軟件設(shè)計的雙通道數(shù)字鎖相放大器和濾波器對信號進行解調(diào)。基于1528nm的DFB激光器,使用CF-WMS對標配濃度的乙炔氣體進行檢測和監(jiān)測,驗證我們提出方法的準確性和可行性。
[Abstract]:Wavelength modulation technique (WMS) is one of the most important methods for the detection of trace gas. However, in the wavelength modulation technique, the inversion of gas concentration needs to measure the intensity fluctuation and intensity modulation response of wavelength scanning without absorption.Scanning wavelength variation and current modulation wavelength response are used to simulate the WMS spectral profile.The simulation of current modulation wavelength response signal greatly increases the complexity of technology.Up to now, the methods of obtaining the wavelength modulation response signal of semiconductor laser require parameter fitting. In order to solve this problem, zero fitting parameters are realized.A method to determine the wavelength response function of current modulation based on scanning current wavelength function is proposed. The main work of this paper is as follows: 1) based on WMS technology,A method for determining the wavelength response of DFB laser current modulation based on scanning current wavelength function is proposed and developed. The CMWR signal is realized without measurement.The accuracy and accuracy of the proposed method are verified by comparing the results of this method with those of the traditional three methods.The advantages include: 1) avoiding the constant method, the first order derivative method and the 2f method to fit the parameters, realizing the non-measurement of the wavelength modulation response signal, and achieving the goal of zero fitting parameters. The accuracy of describing the CMWR is higher than that of the constant method and the first order derivative method.It reduces the complexity of the measurement process and simplifies the experimental operation process. It can be used in the design and construction of a CF-WMS-based experimental system for non-calibration wavelength modulation spectral measurement.The new method of CMWR signal acquisition is applied to the spectrum measurement technique of non-scalable wavelength modulation, and the signal is demodulated by using the dual-channel digital phase-locked amplifier and filter designed by Labview software.The DFB laser based on 1528nm is used to detect and monitor the standard concentration of acetylene gas by using CF-WMS to verify the accuracy and feasibility of the proposed method.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN24

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本文編號：1711297