免标定波长调制吸收光谱技术用于乙炔探测的研究
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摘要
利用近红外可调谐半导体激光器结合自主设计的柱面镜光学多通池,采用免标定波长调制吸收光谱技术实现了乙炔气体的痕量探测;实验中,使用中心波长为1.53μm的分布式反馈二极管激光器和有效光程为10.5m的柱面镜光学多通池,采用免标定波长调制吸收光谱技术对乙炔气体进行探测,并利用Allan方差对系统性能进行分析;对免标定波长调制吸收光谱技术与传统波长调制吸收光谱技术进行对比分析。结果表明:相比于传统的波长调制技术,免标定波长调制吸收光谱技术具有系统结构简单、灵敏度高以及浓度和光功率免标定等特点,可以提高系统的探测灵敏度和测量精度;使用免标定波长调制吸收光谱技术时,系统的测量误差小于5%,测量精度是传统波长调制技术的3.5倍,平均时间为1s时的系统探测灵敏度为0.127×10~(-6),平均时间为118s时的系统探测灵敏度可达0.031×10~(-6)。
Calibration-free trace detection of acetylene gas is achieved by near infrared tunable diode laser absorption spectroscopy combined with a self-designed cylindrical mirror multi-pass absorption cell.A distributed feedback diode laser emission at 1.53μm and the cylindrical mirrors multi-pass absorption cell with an effective optical path length of 10.5 mis used.The calibration-free wavelength modulation absorption spectroscopy is used to detect the acetylene,and the Allan variance is used to analyze the system performance.This technology is compared with the traditional wavelength modulation spectroscopy.The results show that compared with traditional wavelength modulation absorption spectroscopy,calibration-free wavelength modulation absorption spectroscopy has advantages of simple structure,high sensitivity,and calibration-free of concentration and optical power,which improve detection sensitivity and measurement accuracy of the system.The measurement error of the technology is less than 5%,and it is 3.5 times that of traditional wavelength modulation technology.The detection sensitivity of the system is 0.127×10~(-6) with average time of 1 s,and the detection sensitivity is 0.031×10~(-6) with average time of 118 s.
Calibration-free trace detection of acetylene gas is achieved by near infrared tunable diode laser absorption spectroscopy combined with a self-designed cylindrical mirror multi-pass absorption cell.A distributed feedback diode laser emission at 1.53μm and the cylindrical mirrors multi-pass absorption cell with an effective optical path length of 10.5 mis used.The calibration-free wavelength modulation absorption spectroscopy is used to detect the acetylene,and the Allan variance is used to analyze the system performance.This technology is compared with the traditional wavelength modulation spectroscopy.The results show that compared with traditional wavelength modulation absorption spectroscopy,calibration-free wavelength modulation absorption spectroscopy has advantages of simple structure,high sensitivity,and calibration-free of concentration and optical power,which improve detection sensitivity and measurement accuracy of the system.The measurement error of the technology is less than 5%,and it is 3.5 times that of traditional wavelength modulation technology.The detection sensitivity of the system is 0.127×10~(-6) with average time of 1 s,and the detection sensitivity is 0.031×10~(-6) with average time of 118 s.
引文
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[3]Liu K,Wang L,Tan T,et al.Highly sensitive detection of methane by near-infrared laser absorption spectroscopy using a compact dense-pattern multipass cell[J].Sensors and Actuators B,2015,220:1000-1005.
[4]Tan T,Liu K,Wang G S,et al.Research on high sensitivity measurement of N2O and CO based on MIR-QCL and novel compact multi-pass gas cell[J].Acta Optica Sinica,2015,35(2):0230005.谈图,刘锟,王贵师,等.基于中红外QCL激光和新型多通池高灵敏度测量CO和N2O的研究[J].光学学报,2015,35(2):0230005.
[5]Xia H,Wu B,Zhang Z R,et al.Stability study on high sensitive CO monitoring in near-infrared[J].Acta Physica Sinica,2013,62(21):214208.夏滑,吴边,张志荣,等.近红外波段CO高灵敏检测的稳定性研究[J].物理学报,2013,62(21):214208.
[6]Gao G Z,Cai T D.CO concentration measurement using multi-mode laser diode absorption spectroscopy near 1570nm[J].Acta Optica Sinica,2016,36(5):0530002.高光珍,蔡廷栋.1570nm附近多模二极管激光吸收光谱CO浓度测量[J].光学学报,2016,36(5):0530002.
[7]Li H J,Rieker G B,Liu X,et al.Extension of wavelength-modulation spectroscopy to large modulation depth for diode laser absorption measurements in high-pressure gases[J].Applied Optics,2006,45(5):1052-1061.
[8]Goldenstein C S,Strand C L,Schultz I A,et al.Fitting of calibration-free scanned-wavelengthmodulation spectroscopy spectra for determination of gas properties and absorption lineshapes[J].Applied Optics,2014,53(3):356-367.
[9]Salati S H,Khorsandi A.Apodized 2f/1f wavelength modulation spectroscopy method for calibration-free trace detection of carbon monoxide in the near-infrared region:theory and experiment[J].Applied Physics B,2014,116(3):521-531.
[10]Rieker G B,Jeffries J B,Hanson R K.Calibrationfree wavelength-modulation spectroscopy for measurements of gas temperature and concentration in harsh environments[J].Applied Optics,2009,48(29):5546-5560.
[11]Sun K,Chao X,Sur R,et al.Analysis of calibrationfree wavelength-scanned wavelength modulation spectroscopy for practical gas sensing using tunable diode lasers[J].Measurement Science and Technology,2013,24(12):125203.
[12]Wei M,Kan R F,Chen B,et al.Calibration-free wavelength modulation spectroscopy for gas concentration measurements using aquantum cascade laser[J].Applied Physics B,2017,123(5):149.
[13]Qu Z C,Ghorbani R,Valiev D,et al.Calibrationfree scanned wavelength modulation spectroscopyapplication to H2O and temperature sensing in flames[J].Optics Express,2015,23(12):16492-16499.
[14]Chen J J,Zhao W X,Gao X M,et al.Optical multipass cell based on two cylindrical mirrors for high sensitivity detection of methane[J].Acta Optica Sinica,2015,35(9):0930003.陈家金,赵卫雄,高晓明,等.基于柱面镜光学多通池的CH4高灵敏度探测[J].光学学报,2015,35(9):0930003.
[15]Rothman L S,Gordon I E,Babikov Y,et al.The HITRAN2012molecular spectroscopic database[J].Journal of Quantitative Spectroscopy and Radiative Transfer,2013,130:4-50.
[16]Werle P,Mücke R,Slemr F.The limits of signal averaging in atmospheric trace-gas monitoring by tunable diode-laser absorption spectroscopy(TDLAS)[J].Applied Physics B,1993,57(2):131-139.