Wavelength modulation technique-based photoacoustic spectroscopy for multipoint gas sensing

Wang Z. L.; Tian C. W.; Liu Q.; Chang J.; Zhang Q. D.; Zhu C. G.

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Wavelength modulation technique-based photoacoustic spectroscopy for multipoint gas sensing

机译：基于波长调制技术的多点气体传感的光声光谱

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A multipoint gas sensing scheme based on photoacoustic spectroscopy was proposed. Multiple photoacoustic spectroscopy (PAS) gas cells (resonant frequency f(0) = 5.0 kHz) were connected in series for the multipoint gas sensing with wavelength modulation technique. The PAS signal was excited by modulating the tunable distributed feedback laser diode wavelength at f(0)/2 using a changing driving current. The gas concentration of each gas cell was obtained by the PAS signal, which was demodulated by the lock-in amplifier. A multipoint PAS experiment to detect the water vapor at 1368.597 nm was implemented to verify the scheme we presented. With the three PAS gas cells, the linear response to the water vapor concentration of our sensors achieved 0.9978, 0.99591, and 0.99617, and their minimum detection limits were 479, 662, and 630 ppb, respectively. (C) 2018 Optical Society of America

机译：提出了一种基于光声光谱的多点气体传感方案。多点光声光谱（PAS）气体电池（谐振频率f（0）= 5.0 kHz）串联连接有波长调制技术的多点气体感应。通过使用改变的驱动电流调制在F（0）/ 2处的可调谐分布式反馈激光二极管波长，可以激发PAS信号。通过PAS信号获得每个气体电池的气体浓度，该PAS信号由锁定放大器解调。实施了在1368.597 NM处检测水蒸气的多点PAS实验，以验证我们提出的方案。利用三种PAS气体电池，对我们传感器的水蒸气浓度的线性响应达到0.9978,0.99591和0.99617，其最小检测限为479,662和630ppb。（c）2018年光学学会

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《Applied optics》 |2018年第11期|共6页
作者
Wang Z. L.; Tian C. W.; Liu Q.; Chang J.; Zhang Q. D.; Zhu C. G.;
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作者单位

Liaocheng Univ Sch Phys Sci &

Informat Technol Liaocheng Peoples R China;

Liaocheng Univ Sch Phys Sci &

Informat Technol Liaocheng Peoples R China;

Liaocheng Univ Sch Phys Sci &

Informat Technol Liaocheng Peoples R China;

Shandong Univ Sch Informat Sci &

Engn Jinan 250100 Shandong Peoples R China;

Shandong Univ Sch Informat Sci &

Engn Jinan 250100 Shandong Peoples R China;

Univ Jinan Sch Phys &

Technol Jinan 250022 Shandong Peoples R China;

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Wavelength modulation technique-based photoacoustic spectroscopy for multipoint gas sensing

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