Hui Zhang

Cavity-Enhanced Beat Frequency Light-Induced Thermoelastic Spectroscopy Using Differential-Frequency Demodulation

Hongqiang Fan, Mengpeng Hu, Hui Zhang, Dongqing Zhang

The calibration of the resonant frequency and Q factor of a quartz tuning fork (QTF) in light-induced thermoelastic spectroscopy (LITES) is essential, but time-consuming and disruptive to ongoing measurements. We report on a beat-frequency (BF) method based on differential-frequency demodulation to achieve …

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Precise Spectral Measurement of Acetylene Enabled by an All-Fiber Acousto-Optic Dual-Comb Interferometer

Mengpeng Hu, Hui Zhang, Jinguang Lv, Jingqiu Liang et autres

We report the precise measurement of acetylene spectrum using an acousto-optic dual-comb interferometer (AO-DCI) sharing the same seed laser. The AO-DCI operates without the need for locking mechanisms or reliance on nonlinear effects and, thus is particularly well-suited for precise spectroscopy applications …

cn, hk (code pays fourni par la source)

Convergence Analysis of a Solver for the Linear Poisson–Boltzmann Model

Xuanyu Liu, Yvon Maday, Chaoyu Quan, Hui Zhang

Abstract. This work investigates the convergence of a domain decomposition method for the Poisson–Boltzmann model that can be formulated as an interior-exterior transmission problem. To study its convergence, we introduce an interior-exterior constant providing an upper bound of the [Formula: see text] …

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Investigation of a radial-mode-excited piezoelectric tube for photoacoustic gas sensing

Junfeng Zhou, Yukun Liao, Hui Zhang, Mengpeng Hu et autres

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Natural damping of time-harmonic waves and its influence on Schwarz methods

Martin J. Gander, Hui Zhang

The influence of various damping on the performance of Schwarz methods for time-harmonic waves is visualized by Fourier analysis.

Frequency shift-based 3D shape measurement in the presence of strong inter-reflection

Huisi Miao, Wan Liu, Zi‐Yu Yan, Weidong Xu et autres

Traditional fringe projection profilometry (FPP) struggles with robust imaging and high-precision three-dimensional (3D) reconstruction in complex lighting environments with strong inter-reflection. This paper proposes a method combining frequency-shifted fringe projection and epipolar constraint to achieve high-precision 3D profilometry in such scenarios. First, …

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Design of Si3N4 ridge-slot micro-ring resonator and generation of dual-comb based on orthogonally bicolor pumping

J. S. Wen, Qian Wang, Huimin Yu, Zhengwei Wu et autres

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Cavity-enhanced light-induced thermoelastic spectroscopy for trace-gas sensing

Dongqing Zhang, Hui Zhang, Hongqiang Fan, Mengpeng Hu et autres

We report a trace gas sensing technique of cavity-enhanced light-induced thermoelastic spectroscopy (CE-LITES) with a Fabry–Pérot (F-P) optical cavity and a high-quality-factor resonant quartz tuning fork (QTF). Pound-Drever-Hall (PDH) locking method is used to lock the laser to the optical cavity. With …

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Harmonic phase-sensitive detection for quartz-enhanced photoacoustic-thermoelastic spectroscopy

Mengpeng Hu, Dongqing Zhang, Hui Zhang, Yu Liu et autres

Quartz tuning fork (QTF)-based techniques of photoacoustic spectroscopy and thermoelastic spectroscopy play a significant role in trace gas sensing due to unique high sensitivity and compactness. However, the stability of both techniques remains plagued by the inevitable and unpredictable laser power variation …

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Direct Measurement of Dissolved Gas Using a Tapered Single-Mode Silica Fiber

Panpan Sun, Mengpeng Hu, Licai Zhu, Hui Zhang et autres

Dissolved gases in the aquatic environment are critical to understanding the population of aquatic organisms and the ocean. Currently, laser absorption techniques based on membrane separation technology have made great strides in dissolved gas detection. However, the prolonged water-gas separation time of …

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Zero-absorption-assisted multitask learning for simultaneous measurement of acetylene concentration and gas pressure from overlap-deformed spectra

Hongqiang Fan, Pengpeng Wang, Hui Zhang, Mengpeng Hu et autres

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One-dimensional extended Su–Schrieffer–Heeger models as descendants of a two-dimensional topological model

Tao Du, Yuexun Li, He-Lin Lu, Hui Zhang

Abstract The topological phase diagrams and finite-size energy spectra of one-dimensional extended Su–Schrieffer–Heeger (SSH) models with long-range hoppings on the trimer lattice are investigated in detail. Due to the long-range hoppings, the band structure of the original SSH model becomes more complicated …

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