Mr. Mingxuan Duan Profile

Mingxuan Duan

at Xi'an Univ of Technology

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Proceedings Article | 24 May 2023 Paper

Simulation of power-modulation mid-infrared integrated-path differential absorption lidar for probing benzene concentration

Jiahui Liu, Shichun Li, Mingxuan Duan, Yingchun Gao, Wenhui Xin, Dengxin Hua

Proceedings Volume 12706, 127060W (2023) https://doi.org/10.1117/12.2683026

KEYWORDS: LIDAR, Modulation, Visibility, Absorption, Mid-IR, Atmospheric optics

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Aiming at the detection of benzene concentration in the atmosphere, a power-modulation scheme with laser wavenumber tuning is proposed in mid-infrared integrated-path differential absorption (IPDA) lidar. Based on the differential absorption lidar (DIAL) theory, we design the configuration of power-modulation IPDA lidar. Its central measurement and reference wavenumber are selected as 3090.3cm^-1 and 3137.7cm-1, and the power-modulation scheme of IPDA lidar is proposed through interband cascade laser (ICL) current-driving characteristic. The simulation model of power-modulation mid-infrared IPDA lidar is constructed, and then its theoretical analysis is carried out. Furthermore, the retrieval algorithm for benzene concentration is presented, and then the concentration precision as 1/f noise with different frequencies is analyzed with FFT retrievals of 1000. The detection performance of lidar such as signal-to-noise ratio (SNR) and relative error for path length and visibility is compared between direct current (DC) driving and altering current (AC) driving, i.e. power-modulation scheme. The results show that the uncertainty of concentration is consistent with the effect of 1/f noise, that the SNR increases with the increase of visibility or the decrease of path length and the relative error decreases with the increase of visibility or the decrease of path length, and that the SNR will increase with the increase in frequency, and the relative error will decrease under the same path length and visibility. Therefore, the power-modulation mid-infrared IPDA lidar can be more effective for probing benzene concentration.

Proceedings Article | 12 April 2023 Paper

Mid-infrared IPDA lidar for probing atmospheric toluene concentration

Mingxuan Duan, Shichun Li, Cheng Song, Wenhui Xin, Dengxin Hua, Fei Gao

Proceedings Volume 12565, 125652C (2023) https://doi.org/10.1117/12.2662615

KEYWORDS: Signal to noise ratio, LIDAR, Atmospheric sensing, Mid-IR, Gases

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Aiming at the real-time detection of toluene concentration in the atmosphere, an integrated-path differential absorption (IPDA) lidar is proposed based on inter-band cascade lasers. Since the C-H bond of toluene has a slowly-changing absorption spectrum in the mid-infrared band, this IPDA lidar is designed using 2935.5cm^-1 and 3192.0cm^-1 as the operating wavelength by considering the influence of the main interfering gases such as H₂O, CH₄, and HCl. A spectroscopic system with a mid-infrared diffraction grating is configured to realize synchronous detection of dual-wavelength received signals. A retrieval algorithm and its error analysis model for atmospheric toluene concentration are presented. And then the performance of lidar is analyzed and discussed under the conditions of different visibilities, path lengths, and water vapor concentrations by combining with the mid-latitude standard atmospheric model. These results show that the relative error of toluene concentration is less than 10% within the concentration range of 20ppb to 10ppm under the condition of atmospheric visibility of 5km, path length of 1.6km, and the water vapor concentration of less than 0.4%. This IPDA lidar can provide an effective scheme for real-time detection of atmospheric toluene concentration.

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