A5033991556- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Gas Sensing Nanomaterials and Sensors
- Advanced Chemical Sensor Technologies
- Analytical Chemistry and Sensors
- Atmospheric and Environmental Gas Dynamics
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Laser Design and Applications
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Additive Manufacturing Materials and Processes
- Air Quality Monitoring and Forecasting
- Advanced Measurement and Detection Methods
- Fire Detection and Safety Systems
- High Entropy Alloys Studies
- Tribology and Lubrication Engineering
- Advanced Algorithms and Applications
- Seismic Imaging and Inversion Techniques
- Water Quality Monitoring and Analysis
- Magnesium Alloys: Properties and Applications
- Adaptive optics and wavefront sensing
- Spacecraft Design and Technology
- Spacecraft Dynamics and Control
- Satellite Communication Systems
Hong Kong Polytechnic University
2023-2025
Beijing Information Science & Technology University
2024
Jilin University
2015-2024
State Key Laboratory on Integrated Optoelectronics
2015-2024
Zero to Three
2024
Shenzhen Polytechnic
2023-2024
Northeast Electric Power University
2024
Hunan University
2022-2024
Yangtze River Pharmaceutical Group (China)
2024
University of Chinese Academy of Sciences
2022-2023
Abstract On‐chip waveguide spectroscopic sensors have attracted considerable attention due to its potential for large‐scale integration. However, existing gas based on direct absorption spectroscopy (DAS) suffer from limited sensitivity and measurement range. Here waveguide‐based on‐chip photothermal (PTS) is demonstrated detection with high large dynamic field non‐radiation relaxation of molecules the resulted phase modulation are analyzed. By selecting chalcogenide glass (ChG) as...
Cavity-enhanced direct frequency comb spectroscopy (CE-DFCS) is widely used as a highly sensitive gas sensing technology in various detection fields. For the on-axis coupling incidence scheme, accuracy and stability are seriously affected by cavity-mode noise, therefore, stable operation inevitably requires external electronic mode-locking sweeping devices, substantially increasing system complexity. To address this issue, we propose off-axis cavity-enhanced optical from both theoretical...
A near-infrared broadband cavity-enhanced sensor system was demonstrated for the first time using an energy-efficient light emitting diode (LED) with a central emission wavelength at 1650 nm and power of ∼16 mW. portable absorption gas cell designed realizing compact stable optical easy alignment. An ultrashort 8-cm-long cavity fabricated consisting two mirrors ∼99.35% reflectivity. Methane (CH4) measurement performed employing detection schemes, i.e., NIRQuest InGaAs spectrometer scanning...
A wavelength-locked light-induced thermo-elastic spectroscopy (WL-LITES) gas sensor system was proposed for long-distance in-situ methane (CH4) detection using a fiber-coupled sensing probe. The scheme used to speed the response without scanning laser wavelength across CH4 absorption line. small-size piezoelectric quartz tuning fork (QTF) with wide spectral range adopted enhance photo-thermal signal. optical excitation parameters of QTF were optimized based on experiment and simulation...
A vehicle-deployed parts-per-billion in volume (ppbv)-level off-axis integrated cavity output spectroscopic (OA-ICOS) CH4/C2H6 sensor system was experimentally presented for mobile inspection of natural gas leakage urban areas. For the time-division-multiplexing-based dual-gas system, an antivibration 35-cm-long optical with effective path length ∼2510 m fabricated a high-stability temperature and pressure control design. An Allan deviation analysis yielded minimum detection limit 0.2 ppbv...
Slow-light photonic crystal waveguide (PCW) gas sensors based on infrared absorption spectroscopy play a pivotal role in enhancing the on-chip interaction between light and molecules, thereby significantly boosting sensor sensitivity. However, two-dimensional (2D) PCWs are limited by their narrow mode bandwidth susceptibility to polarization, which restricts ability for multigas measurement. Due quasi-TE quasi-TM guiding characteristics one-dimensional (1D) PCW, novel slow-light-enhanced...
For highly sensitive and accurate acetylene (C2H2) detection, a near-infrared (NIR) off-axis integrated-cavity output spectroscopy (OA-ICOS) sensor system based on an ultra-compact cage-based absorption cell was proposed. The with dimensions of 10 cm × 8 6 realized dense-pattern easily-aligned stable optical system. OA-ICOS employed 6cm-long cavity that formed by two mirrors reflectivity 99.35% provided effective path length ∼9.28 m. performance the C2H2 measurement schemes, i.e. laser...
A near-infrared C<sub>2</sub>H<sub>2</sub>/CH<sub>4</sub> sensor was demonstrated utilizing a miniaturized high finesse cavity with sensitivity and remarkable dynamic measurement performance.
Based on near-infrared off-axis integrated cavity output spectroscopy (OA-ICOS), a portable carbon dioxide (CO2) sensor system capable of atmosphere monitoring is proposed by targeting the CO2 absorption lines at 2.004 μm. To address comprehensive issues complex light-adjustment structures, poor sealing, and slow gas replacement, an effective optimization scheme introduced, combining fluid dynamics to produce stable optical resonant with path length 891 m physical 30 cm. The boasts wide...
The recognition and monitoring of marine ranching help to determine the type, spatial distribution dynamic change life, as well promote rational utilization resources ecological environment protection, which has important research significance application value. In study based on high-resolution remote sensing images, convolutional neural network (CNN)-based deep learning method, can adapt different water environments, be used identify multi-scale targets restore boundaries extraction...
In this invited paper, a compact dense-pattern multipass cell-based near-infrared sensor system was demonstrated for detection of parts-per-billion in volume (ppbv)-level methane (CH 4 ) and ethane (C 2 H 6 ). The dimension size the fabricated gas cell is 18.5 × 8 9 cm 3 with an absorption path length 9.39 m. CH measurement realized within spectral range 6,046–6,048 −1 line 6,046.95 . C 5,951–5,953 5,951.73 Allan deviation analysis used evaluating dual-gas sensing performance, limit 78 ppbv...
We report a mid-infrared (MIR) photothermal laser spectroscopy system for multi-component gas sensing with single broadband anti-resonant hollow-core fiber cell. Three MIR pump lasers are used as the excitation sources to generate phase modulation and near-infrared probe is employed detect by using Fabry-Perot interferometer configuration. Simultaneous detection of carbon monoxide (CO), dioxide (CO2), ethylene (C2H4), ethane (C2H6) experimentally demonstrated time-division multiplexing. A...
A near-infrared methane (CH <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> ) sensor system was demonstrated by using off-axis integrated cavity output spectroscopy (OA-ICOS), which an effective gas-phase analytical technique and adopted for fast, real-time in-situ ambient atmospheric CH monitoring. 60 cm-long with absorption path length of 2150 m fabricated a fast response time ~ 0.8 s. An Allan deviation analysis yielded minimum...
Purpose Intelligent and connected vehicle technology is in the ascendant. High-level autonomous driving places more stringent requirements on accuracy reliability of environmental perception. Existing research works multitarget tracking based multisensor fusion mostly focuses perspective, but limited by principal defects sensor platform, it difficult to comprehensively accurately describe surrounding environment information. Design/methodology/approach In this paper, a method roadside...
A vehicle-mounted mobile mid-infrared dual-gas sensor system for simultaneous detection of methane (CH<sub>4</sub>) and ethane (C<sub>2</sub>H<sub>6</sub>) was developed using two interband cascade lasers (ICLs) targeting the absorption line CH<sub>4</sub> at 3038.5 cm<sup>-1</sup> C<sub>2</sub>H<sub>6</sub> 2996.88 cm<sup>-1</sup>, respectively. Two multi-pass gas cells (MPGCs) with an path length 26.4 m were utilized. The limit (1σ) wavelength modulation spectroscopy (WMS) is...