A5101437828- Spectroscopy and Laser Applications
- Advanced Fiber Optic Sensors
- Laser-induced spectroscopy and plasma
- Photonic and Optical Devices
- Atmospheric and Environmental Gas Dynamics
- Analytical chemistry methods development
- Atmospheric Ozone and Climate
- Laser Design and Applications
- Water Quality Monitoring and Analysis
- Cultural Heritage Materials Analysis
- Mercury impact and mitigation studies
- Ultrasonics and Acoustic Wave Propagation
- Air Quality Monitoring and Forecasting
- Advanced Chemical Sensor Technologies
- Advanced MEMS and NEMS Technologies
- Analytical Chemistry and Sensors
- Atmospheric chemistry and aerosols
- Thermography and Photoacoustic Techniques
- Advanced Sensor Technologies Research
- Photorefractive and Nonlinear Optics
- Ocular and Laser Science Research
- IoT-based Smart Home Systems
- Photonic Crystal and Fiber Optics
- Flow Measurement and Analysis
- Fire Detection and Safety Systems
Hohai University
2025
Anhui Institute of Optics and Fine Mechanics
2009-2019
Chinese Academy of Sciences
2011-2019
University of Science and Technology of China
2013-2019
Temper (United States)
2018
Hefei Institutes of Physical Science
2016
University of Strathclyde
1998-2005
Institute of Physics
1995
Academia Sinica
1994
Collaborative Innovation Center of Advanced Microstructures
1993
An effective method for achieving a room-temperature multiwavelength erbium-doped fiber ring laser is presented. Simultaneous lasing with 0.5-nm intervals achieved both experimentally and theoretically by addition of sinusoidal phase modulation in the cavity to prevent single-wavelength oscillation.
We propose a method for localizing fire source using an optical fiber distributed temperature sensor system. A section of two parallel fibers employed as the sensing element is installed near ceiling closed room in which located. By measuring hot air flows, problem three-dimensional localization transformed to dimensions. The location verified with experiments burning alcohol source, and it demonstrated that represents robust reliable technique also long ranges.
We report the first application of gas total emission using a DFB diode laser for concentration measurements combined with two LEDs velocity measurements. In situ emissions and particle density in an industrial pipeline simultaneous tunable absorption spectroscopy (TDLAS) optical scintillation cross-correlation technique (OSCC) are presented. Velocity mean values obtained 7.59 m/s (OSCC, standard deviation is 1.37 m/s) 8.20 (Pitot tube, 1.47 steel plant comparison. Our experiments...
Based on tunable diode laser absorption spectroscopy (TDLAS), two-dimensional (2D) distribution reconstructions of gas concentration and temperature are realized using an algebraic reconstruction technique (ART). The influence the beam grid size combustion field is investigated to attain optimal results with a limited number beams. Under optical-path numbers, it shows that better spatial resolution attainable only when paths vertical parallel symmetry axis field. Furthermore, experiments 16...
We propose an accelerometer based on a micro-cantilever fabricated onto the side of single mode optical fiber using combination ps-laser machining and focused ion beam (FIB) processing. FIB is also used to fabricate 45° mirror end that accurately aligned with core. This provides reliable means optically address components attached fiber, such as cantilever. Using interferometry monitor deflection cantilever results in device capable measuring two-axis acceleration. Acceleration up 6 g...
Laser-induced breakdown spectroscopy (LIBS) is a versatile tool for both qualitative and quantitative analysis. In this paper, LIBS combined with principal component analysis (PCA) support vector machine (SVM) applied to rock Fourteen emission lines including Fe, Mg, Ca, Al, Si, Ti are selected as lines. A good accuracy (91.38% the real rock) achieved by using SVM analyze spectroscopic peak area data which processed PCA. It can not only reduce noise dimensionality contributes improving...
In this work, calibration-free laser-induced breakdown spectroscopy (CF-LIBS) is used to analyze a certified stainless steel sample. Due self-absorption of the spectral lines from major element Fe and sparse trace elements, it usually not easy construct Boltzmann plots all species. A standard reference line method proposed here solve difficulty under assumption local thermodynamic equilibrium so that same temperature value for elements present into plasma can be considered. Based on...
Due to the influence of self-absorption major elements, scarce observable spectral lines trace and relative efficiency correction experimental system, accurate quantitative analysis with calibration-free laser-induced breakdown spectroscopy (CF-LIBS) is in fact not easy. In order overcome these difficulties, standard reference line (SRL) combined one-point calibration (OPC) used analyze six elements three stainless-steel five heat-resistant steel samples. The Stark broadening Saha-Boltzmann...
Laser-Induced Breakdown Spectroscopy (LIBS) has been demonstrated to be an effective method for slag analysis. In order better clarify the nature of plasma generated from a sample, Nd:YAG pulse laser at 1064 nm wavelength was used ablate sample in air. The temporal and spatial evolutions parameters, including emission intensity, electronic density temperature, have studied. It is shown that electron temperature drop off rapidly with delay time as result expansion cooling. found whole close...
Sensitive detection of hydrogen sulfide (H2S) has been performed by means wavelength modulation spectroscopy (WMS) near 1.578 μm. With the scan amplitude and stability background baseline taken into account, response time is 4 s for a 0.8 L multi-pass cell with 56.7 m effective optical path length. Moreover, linearity tested in 0–50 ppmv range. The limit achievable Allan variance 224 ppb within 24 under room temperature ambient pressure conditions. This tunable diode laser absorption (TDLAS)...
A method for localizing a fire source based on distributed temperature sensor system is proposed. Two sections of optical fibers were placed orthogonally to each other as the sensing elements. tray alcohol was lit act outbreak in cabinet with an uneven ceiling simulate real scene fire. Experiments carried out demonstrate feasibility method. Rather large fluctuations and systematic errors respect predicting exact room coordinates caused by observed. mathematical methods (smoothing recorded...
The development of a fast in situ optical sensor based on continuous-wave quantum cascade laser operating at 8 μm for the measurement environmental gaseous nitrous acid (HONO) is reported. A strong absorption line 1252.2109 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> found to be free interferences and used first time ambient HONO detection. Loss wall gas sample cell evaluated. resulting 1-s detection limit 110 pptv with folded...