【摘要】：利用二氧化碳氣體分子在4.25μm處的基頻吸收帶,研制了一種差分式中紅外二氧化碳檢測系統(tǒng).系統(tǒng)的光路部分由熱輻射紅外光源、雙通道熱釋電探測器和球面反射鏡構(gòu)成,電路部分主要包括信號處理、光源驅(qū)動及主控模塊.采用Tracepro軟件對氣室結(jié)構(gòu)進行仿真和優(yōu)化設(shè)計,使氣體吸收光程達到30cm,改善了系統(tǒng)的性能.實驗研究了系統(tǒng)對不同濃度二氧化碳氣體樣品的傳感特性.實驗結(jié)果表明,由擬合曲線得到的濃度與實際濃度誤差較小,在0~5 000ppm范圍內(nèi),測得二氧化碳濃度的標(biāo)準(zhǔn)差小于45ppm,而在500ppm以下,測量濃度的標(biāo)準(zhǔn)差小于5ppm;對濃度為0ppm的二氧化碳氣體樣品連續(xù)測量2h,測量結(jié)果的標(biāo)準(zhǔn)差約為2.8ppm;根據(jù)Allan方差分析得到系統(tǒng)的1σ檢測下限為2.5ppm.在每個二氧化碳傳感器上增加無線模塊nRF24L01,構(gòu)成傳感器節(jié)點,在選定的日光溫室大棚中構(gòu)建了無線傳感器網(wǎng)絡(luò),采集了溫室大棚中的二氧化碳濃度信息,驗證了所研制的傳感器性能.
[Abstract]:Using the fundamental absorption band of carbon dioxide at 4.25 渭 m, a differential mid-infrared carbon dioxide detection system has been developed. The optical circuit of the system is composed of a thermal radiation infrared light source, a two-channel pyroelectric detector and a spherical reflector. The circuit includes signal processing, light source driving and main control module. The structure of gas chamber is simulated and optimized by Tracepro software, which makes the light path of gas absorption reach 30 cm, and improves the performance of the system. The sensing characteristics of carbon dioxide gas samples with different concentrations were studied experimentally. The experimental results show that the error between the concentration obtained from the fitting curve and the actual concentration is relatively small. In the range of 0 ~ 5 000ppm, the standard deviation of the measured carbon dioxide concentration is less than 45 ppm, but below 500ppm. The standard deviation of the measured concentration is less than 5 ppm.The standard deviation of the measured results is about 2.8 ppmfor 2 h for the carbon dioxide gas samples with the concentration of 0ppm, and the 1 蟽 detection limit of the system is 2.5 ppm according to the Allan variance analysis. The wireless module nRF24L01, is added to each carbon dioxide sensor to form the sensor node. The wireless sensor network is constructed in the selected greenhouse, and the information of carbon dioxide concentration in the greenhouse is collected. The performance of the sensor is verified.
【作者單位】： 集成光電子學(xué)國家重點聯(lián)合實驗室吉林大學(xué)實驗區(qū)吉林大學(xué)電子科學(xué)與工程學(xué)院;
【基金】：國家科技支撐計劃項目(Nos.2014BAD08B03-4,2013BAK06B04) 國家重點研發(fā)計劃課題(Nos.2016YFD0700101,2016YFC0303902) 國家自然科學(xué)基金項目(Nos.61307124,61627823) 吉林省科技發(fā)展計劃項目(Nos.20120707,20140307014SF) 長春市科技發(fā)展計劃項目(Nos.11GH01,14KG022)資助~~
【分類號】：TP212

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