【摘要】：本工作來源于國(guó)家科技支撐計(jì)劃：“煤礦用紅外CO檢測(cè)儀(傳感器)研發(fā)”。 煤炭的不充分燃燒會(huì)產(chǎn)生甲烷和CO氣體，輕者使人中毒，重者造成火災(zāi)礦難，近年來，各地火災(zāi)礦難事件頻發(fā)，嚴(yán)重威脅著人們的生命財(cái)產(chǎn)安全。隨著半導(dǎo)體技術(shù)飛速發(fā)展，以它為基礎(chǔ)的分布反饋式半導(dǎo)體激光器(DFB)也得到了廣泛的應(yīng)用，尤其是用于以朗伯比爾定律為基礎(chǔ)的紅外氣體檢測(cè)中�？烧{(diào)諧二極管激光吸收光譜技術(shù)（TDLAS）具有高靈敏度和高選擇性，而其中的二次諧波具有與濃度相關(guān)信息，需經(jīng)過鎖相放大器才能提取，因此研究本課題具有重要意義。 在紅外氣體檢測(cè)中，基于可調(diào)諧二極管激光吸收光譜技術(shù)，本文設(shè)計(jì)了一種正交鎖相放大器來提取諧波信號(hào)。首先，在MATLAB的Simulink軟件仿真平臺(tái)上，模擬了整個(gè)實(shí)驗(yàn)系統(tǒng)，旨在對(duì)它的功能進(jìn)行仿真和驗(yàn)證。然后，將DSP(數(shù)字信號(hào)處理器)作為核心控制器，并搭建了諧波信號(hào)鎖相放大器的真實(shí)硬件系統(tǒng)。最后，通過實(shí)驗(yàn)，驗(yàn)證硬件系統(tǒng)的各個(gè)功能的可行情況。 首先采用標(biāo)準(zhǔn)的正弦信號(hào)作為待測(cè)信號(hào)，對(duì)輸入輸出信號(hào)幅值進(jìn)行對(duì)比，測(cè)量最大誤差小于4%，，線性擬合優(yōu)度達(dá)到0.99994；其次，利用待測(cè)信號(hào)（ARM模擬經(jīng)氣體吸收后的差分信號(hào)）和參考信號(hào)（分別是同頻及倍頻方波）來提取諧波信號(hào)。一次諧波最大誤差小于3.5%，由于微弱的二次諧波信號(hào)易受噪聲的干擾，因此它的誤差在5%以內(nèi)。最后通過改變輸入信號(hào)的濃度值，分別提取出相應(yīng)的二次諧波信號(hào)。該系統(tǒng)的高穩(wěn)定性和性價(jià)比，使得它具有廣闊的應(yīng)用前景。 本文創(chuàng)新點(diǎn)：1、自主研發(fā)并實(shí)現(xiàn)了一種用于諧波信號(hào)提取的便攜式正交鎖相放大器，它無需參考信號(hào)與待測(cè)信號(hào)同頻同相，省去了復(fù)雜的移相環(huán)節(jié)，簡(jiǎn)化了硬件系統(tǒng)設(shè)計(jì)的復(fù)雜度。2、該便攜式儀器可用于基于TDLAS技術(shù)的任意氣體檢測(cè)中，例如甲烷，CO，水汽等。
[Abstract]:This work comes from the national science and technology support plan: research and development of infrared CO detector (sensor) for coal mine. Insufficient combustion of coal will produce methane and CO gas, light people poisoning, heavy ones cause fire mine disaster. In recent years, fire and mine accidents occur frequently all over the country, which seriously threaten the safety of people's life and property. With the rapid development of semiconductor technology, distributed feedback semiconductor laser (DFB) based on it has been widely used, especially in infrared gas detection based on Lambert's law. Tunable diode laser absorption spectroscopy (TDLAS) has high sensitivity and selectivity, and the second harmonic has concentration-related information, which requires phase-locked amplifier to be extracted. Therefore, it is of great significance to study this subject. In infrared gas detection, based on tunable diode laser absorption spectroscopy, an orthogonal phase-locked amplifier is designed to extract harmonic signals. Firstly, on the Simulink software simulation platform of MATLAB, the whole experiment system is simulated in order to simulate and verify its function. Then, the DSP (Digital signal processor) is used as the core controller, and the real hardware system of the harmonic signal PLL amplifier is built. Finally, through the experiment, the feasibility of each function of the hardware system is verified. Firstly, the standard sine signal is used as the signal to be measured, and the amplitude of the input and output signal is compared. The maximum error of measurement is less than 4%, and the linear goodness of fit is 0.99994. Secondly, the harmonic signal is extracted by using the signal to be measured (ARM simulates the differential signal absorbed by gas) and the reference signal (which is the same frequency and double frequency square wave respectively). The maximum error of the first harmonic is less than 3.5%. Because the weak second harmonic signal is easily disturbed by noise, its error is less than 5%. Finally, the second harmonic signal is extracted by changing the concentration value of the input signal. Because of its high stability and cost-performance, the system has a broad application prospect. The innovation of this paper is as follows: 1. A portable quadrature phase-locked amplifier for harmonic signal extraction is developed and implemented independently. It does not need the reference signal and the signal to be measured in the same frequency and phase, and saves the complicated phase-shift link. The design complexity of hardware system is simplified. 2. The portable instrument can be used in any gas detection based on TDLAS technology, such as methane, CO, water vapor and so on.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN722

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李黎;張宇;宋振宇;安宇鵬;曹峰;王一丁;;紅外光譜技術(shù)在氣體檢測(cè)中的應(yīng)用[J];紅外;2007年09期

2 李潔;嚴(yán)高師;;近紅外波長(zhǎng)CO濃度檢測(cè)技術(shù)[J];激光與紅外;2006年03期

3 樊鳳杰;孟宗;;差分吸收式光纖甲烷氣體傳感器的研究[J];計(jì)量技術(shù);2008年03期

4 賀玉凱;王汝琳;劉中奇;張豐;關(guān)中輝;;紅外一氧化碳檢測(cè)中干擾因素分析及補(bǔ)償方法研究[J];礦山機(jī)械;2006年03期

5 唐偉杰;吳明友;曹少泳;;基于Matlab/Simulink與單片機(jī)的動(dòng)態(tài)溫度監(jiān)控系統(tǒng)的設(shè)計(jì)[J];煤礦機(jī)械;2012年03期

6 郭月俊;王彪;;TDLAS檢測(cè)系統(tǒng)的ARM主控型激光驅(qū)動(dòng)電路的設(shè)計(jì)[J];激光雜志;2014年07期

7 倪家升;劉統(tǒng)玉;王昌;常軍;宋志強(qiáng);王黔;劉真梅;翟瑞占;;用于痕量檢測(cè)微弱信號(hào)提取的鎖相放大電路設(shè)計(jì)及實(shí)現(xiàn)[J];山東科學(xué);2009年05期

8 胡紹民,張廣發(fā);一種基于DSP和采樣ADC的數(shù)字鎖定放大器[J];數(shù)據(jù)采集與處理;2000年02期

9 趙紅利;;基于Simulink的低通數(shù)字濾波器的仿真分析[J];數(shù)字技術(shù)與應(yīng)用;2011年11期

10 林凌,王小林,李剛,王朔,劉銘;一種新型鎖相放大器檢測(cè)電路[J];天津大學(xué)學(xué)報(bào);2005年01期

本文編號(hào)：2438292