A5077879560- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Gas Sensing Nanomaterials and Sensors
- Laser Design and Applications
- Advanced Chemical Sensor Technologies
- Water Quality Monitoring and Analysis
- Advanced Fiber Optic Sensors
- Photoacoustic and Ultrasonic Imaging
- Photonic and Optical Devices
- Laser-induced spectroscopy and plasma
- Analytical Chemistry and Sensors
- Spectroscopy and Chemometric Analyses
- Analytical chemistry methods development
- Mercury impact and mitigation studies
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Air Quality Monitoring and Forecasting
- Advanced Algorithms and Applications
- Thermography and Photoacoustic Techniques
- Optical Coherence Tomography Applications
- Genetic diversity and population structure
- Random lasers and scattering media
- Optical Imaging and Spectroscopy Techniques
- Advanced Sensor and Control Systems
Shandong Academy of Sciences
2022-2025
Qilu University of Technology
2022-2025
Laser Research Institute
2023
Shandong University
2017-2021
UCLouvain
2020
Huazhong Agricultural University
2007
Due to the extremely complex working conditions, various health and safety hazards are present in underground coal mines, which cause economic losses heavy casualties. Among these hazards, methane gas explosion combustion recognized as two major miners. Traditional electronic sensors mine monitoring systems have problems such low precision, a large amount of maintenance, dead zones. In past decade, based on tunable diode laser absorption spectroscopy (TDLAS) been extensively studied tailored...
The accuracy of LIBS coal quality detection was improved after matrix calibration, and the evaluated by using carbon dioxide emission level net calorific value.
We proposed a new method for gas detection in photoacoustic spectroscopy based on acousto-optic Q-switched fiber laser by merging transmission PAS cell (resonant frequency f₀ = 5.3 kHz) inside the cavity. The Q-switching was achieved an modulator, achieving peak pulse power of ~679 mW case modulation signal with optimized duty ratio 10%. used custom-made Bragg grating central wavelength 1530.37 nm (the absorption C₂H₂) to select wavelength. system linear response (R² 0.9941) concentration...
A photodetector with a commercial quartz tuning fork (QTF) based on photothermal effect was demonstrated. Unlike the commonly used thermosensitive elements, QTF mechanical resonance ability and piezoelectric to amplify signal. Operating at optimal operating distance modulation signal duty ratio selected for photodetector, achieved good linear response wavelength of 1550 nm 980 nm. And photoresponsivity reach up 515 mV/mW More important, detection sensitivity 0.75 pW 203 s integration time...
A multi-gas quartz enhanced photoacoustic spectroscopy (QEPAS) sensor based on three tuning forks (QTFs) with different response frequencies for trace gas detection was proposed and experimentally demonstrated. Three near-infrared DFB lasers are used to monitor water vapor, methane, acetylene in the parts per million range. The system first evaluated individual H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O, CH...
A multipoint gas sensing scheme based on photoacoustic spectroscopy was proposed. Multiple (PAS) cells (resonant frequency f0=5.0 kHz) were connected in series for the with wavelength modulation technique. The PAS signal excited by modulating tunable distributed feedback laser diode at f0/2 using a changing driving current. concentration of each cell obtained signal, which demodulated lock-in amplifier. experiment to detect water vapor 1368.597 nm implemented verify we presented. With three...
A high-sensitivity quartz enhanced photoacoustic spectroscopy (QEPAS) system based on acousto-optic Q-switched fiber laser for C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> H detection was proposed and experimentally demonstrated. The gas sensor coupled an erbium-doped with a custom-made transmission tuning fork structure. An modulator used to perform amplitude modulation at frequency of 32.76 kHz the achieved maximum intra-cavity...
In this article, a dual-spectroscopy gas sensing system based on ring cavity laser and quartz tuning fork (QTF) is designed. A 15 m erbium-doped fiber (EDF) with 1500 ppm doping concentration used as gain medium, piezoelectric transducer (PZT) acousto-optic modulator (AOM) are detection methods. The first collimator (FC) emits beam; the received by second FC after passing through an off-beam acoustic micro-resonator (AmR) for quartz-enhanced photoacoustic spectroscopy (QEPAS) signal...
A highly sensitive and reliable tunable diode laser absorption spectroscopy gas detection system with a temperature–pressure compensation algorithm is demonstrated for detecting CH 4 concentrations in near space. Near space generally refers to the airspace 20–100 km away from ground, where temperature pressure changes are complex. Since spectrum easily affected by pressure, proposed used sensor improve accuracy of sensor. First, we measured basic characteristics laboratory, such as linearity...
The temperature fluctuations inside commercially distributed feedback laser diode were experimentally measured and analyzed in detail this study. In tunable absorption spectroscopy based gas sensing systems, the of source is usually fixed a current signal used to drive for wavelength scanning or modulation. Even if controlled by robust controller, internal still fluctuates due delayed response controller when rapidly changing current. These result distortions signals which can be effectively...