便攜式低頻鎖相放大器的研制及其紅外CO氣體檢測應用
[Abstract]:This thesis is based on the National Science and Technology support Program, Research and Development of Infrared CO detector (Sensor) for Coal Mine. Due to the advantages of high sensitivity, high performance-to-price ratio and high selectivity, infrared gas detection method has been widely concerned by researchers in the field of gas detection at home and abroad. Phase-locked amplification is one of the key techniques for detecting weak infrared sensing signals. It can extract useful signals from strong background noise, which is of great significance to the development of infrared gas sensors and the improvement of their performance. In view of this, a portable dual channel low frequency phase-locked amplifier is developed, which is applied to the detection of infrared carbon monoxide gas. After analyzing the research trends of infrared gas detection technology and phase-locked amplification technology at home and abroad, this paper firstly introduces the related principles of infrared gas detection system, including the principle of molecular infrared absorption spectrum and the principle of phase-locked amplification. Then, the simulation experiment system is established by using the Simulink software simulation platform, which proves the feasibility of the design of this paper. On the basis of this, the hardware and software design of two-channel low-frequency phase-locked amplifier is presented. Through the functional verification experiment and the carbon monoxide gas detection experiment, each technical index of the low-frequency phase-locked amplifier is tested one by one. First of all, the functional verification experiment of two-channel low-frequency phase-locked amplifier is carried out. The results show that the minimum standard signal amplitude is 1m V, and when the phase shift angle is changed continuously, the relative phase shift error is smaller when the phase difference is larger, and the results are less than 0.2. Gas detection experiments were carried out using carbon monoxide standard gas equipped with volume fraction of 0-1000ppm. The results show that the detection limit of the system is 10 ppm, the relative measurement error is less than 15, when the concentration of carbon monoxide is 0ppm, the detected gas concentration fluctuates slightly between -5.2 ppm-6.2 ppm. The fluctuation is within the allowable range of the actual gas detection process. The Aron variance of the system is calculated and the detection limit of the predicted system is 1.19 ppm. The response time of the system is about 58-62s considering the diffusion time of the gas in the gas chamber. Through the experiments, the function of the phase-locked amplifier has been verified, and the requirement of extracting weak signal in the field of infrared gas detection has been met. The dual-channel low-frequency phase-locked amplifier developed in this paper has the advantages of simple structure, high performance-to-price ratio and easy embedding. It has a good application prospect in the development of infrared gas sensor and the signal processing of weak sensor.
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TN722
【參考文獻】
相關期刊論文 前10條
1 陳學軍;楊永明;;一種基于雙波段紅外視頻火災探測器的研制[J];電子測量與儀器學報;2016年03期
2 萬福;陳偉根;顧朝亮;鄒經(jīng)鑫;杜玲玲;漆薇;周渠;;光反饋腔增強吸收光譜技術的痕量乙烷檢測研究[J];光譜學與光譜分析;2015年10期
3 郭靜波;譚博;蔡雄;;基于反相雙峰指數(shù)模型的微弱瞬態(tài)極低頻信號的估計與檢測[J];儀器儀表學報;2015年08期
4 馬龍;;TDLAS技術在煤礦災害氣體檢測領域的應用[J];煤礦安全;2015年06期
5 梁曉軍;陳光柱;;基于ARMv7-M架構的礦用多參數(shù)氣體檢測儀的設計[J];儀表技術與傳感器;2015年03期
6 韋民紅;童敏明;肖建于;李素文;;基于差分吸收光譜技術的大氣痕量氣體重建算法[J];儀器儀表學報;2015年02期
7 孟浩玉;王彥;汪誠偉;胡興柳;方挺;;基于鎖相放大原理的微弱光信號檢測系統(tǒng)設計[J];光學與光電技術;2014年06期
8 趙星;李小霞;李勇;;基于FPGA的鎖相放大器在多組分氣體檢測中的應用[J];電腦知識與技術;2014年34期
9 李國林;董明;宋楠;宋芳;鄭傳濤;王一丁;;基于中紅外光譜吸收技術的一氧化碳氣體檢測系統(tǒng)[J];光譜學與光譜分析;2014年10期
10 黃漸強;翟冰;葉瑋琳;鄭傳濤;王一丁;;基于波長調(diào)制技術的近紅外甲烷檢測儀[J];光電子.激光;2014年05期
相關博士學位論文 前3條
1 李彬;近紅外光譜吸收式氣體檢測系統(tǒng)的研究[D];吉林大學;2016年
2 王強;近紅外光纖水氣傳感器的關鍵技術研究[D];山東大學;2016年
3 潘衛(wèi)東;基于TDLAS的痕量乙烯氣體檢測技術研究[D];哈爾濱工業(yè)大學;2013年
相關碩士學位論文 前10條
1 武鵬飛;基于FPGA的數(shù)字鎖相放大器在磁珠檢測上的應用[D];重慶大學;2016年
2 叢景宇;基于數(shù)字鎖相放大器的拉曼光譜信號檢測[D];中國海洋大學;2015年
3 劉云龍;面向TDLAS氣體傳感系統(tǒng)的鎖相放大技術研究[D];電子科技大學;2015年
4 趙迎;基于TDLAS技術的氨氣檢測的研究[D];天津大學;2014年
5 程萬前;ARM主控型鎖相放大器的研究[D];中國科學院研究生院(長春光學精密機械與物理研究所);2014年
6 杜彬彬;基于MEMS紅外光源的長光程甲烷氣體檢測系統(tǒng)設計[D];中北大學;2014年
7 聶婭琴;基于鎖相放大器的微弱信號檢測研究[D];中南大學;2014年
8 陳燕;基于ARM的礦用便攜式多氣體檢測儀的研制[D];西安科技大學;2013年
9 曹天書;TDLAS氣體檢測中二次諧波的鎖相放大器的研究[D];吉林大學;2013年
10 郭璐璐;數(shù)字鎖相放大器的設計與實現(xiàn)[D];大連理工大學;2013年
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