A5058068046- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Analytical Chemistry and Sensors
- Spectroscopy and Quantum Chemical Studies
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- thermodynamics and calorimetric analyses
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- stochastic dynamics and bifurcation
- Water Quality Monitoring and Analysis
- Advanced Chemical Sensor Technologies
- Air Quality Monitoring and Forecasting
- Laser Design and Applications
- Advanced Chemical Physics Studies
- Photoacoustic and Ultrasonic Imaging
- Thermography and Photoacoustic Techniques
- Parallel Computing and Optimization Techniques
- Photonic and Optical Devices
Chinese Academy of Sciences
2019-2025
Anhui Institute of Optics and Fine Mechanics
2020-2025
Hefei Institutes of Physical Science
2020-2024
Institute of High Energy Physics
2024
University of Science and Technology of China
2021-2022
Taiyuan University of Science and Technology
2017-2019
Guangzhou Institute of Geochemistry
2019
We report a multi-pass tunable diode laser absorption spectrometer based on the frequency-modulation spectroscopy (FMS) technique. It has advantage of high scan speed and is immune to etalon effect. A Herriott-type cell was used in increase effective optical length 17.5 m compact physical dimensions 60×30×30 cm3. Noise due low-frequency fluctuation power 1/f noise rapid detection are sufficiently reduced by FMS. Interference fringes effectively suppressed when modulation frequency equals...
Owing to the overlapping and cross-interference of absorption lines in multicomponent gases, simultaneous measurement such gases via laser spectroscopy frequently necessitates use supplementary pressure sensors distinguish spectral lines. Alternatively, it requires multiple lasers combined with time-division multiplexing independently scan peaks each gas, thereby preventing interference from other gases. This inevitably escalates both cost system complexity gas pathway. In response these...
Abstract The off‐axis integrated cavity output spectroscopy (OA‐ICOS) represents a suitable solution in many applications with simple structure and high sensitivity. configuration allows the continuous spectrum without mode when wave laser is used while preserving optical resonator's ability to enhance path by tens of thousands times. This review summarizes recent advances OA‐ICOS decades. evolutionary process basic principle are introduced. Various approaches for improving technical...
A resolved line pair was selected for simultaneous measurement of carbon monoxide (CO) and dioxide (CO2) in the near-infrared (NIR) region. The spectral lines CO CO2 at 1.578 µm were measured by wavelength modulation spectroscopy (WMS)-2 f absorption enhanced with a multipass cell. white noise further reduced averaging technology. detection sensitivity (1σ) system is estimated 2.63 × 10-7 cm-1 direct spectroscopy. ultimate limits mixed pure N2 75 Torr are 29 parts per million (ppm) 47 ppm,...
Previous research revealed that isotopes 13C and 18O of exhaled CO2 have the potential link with Helicobacter pylori; however, 17O isotope has received very little attention. We developed a sensitive spectroscopic sensor for simultaneous δ13C, δ18O, δ17O analysis human breath based on mid-infrared laser direct absorption spectroscopy an interband cascade (ICL) at 4.33 μm. There was gas cell small volume less than 5 mL, pressure in precisely controlled standard deviation 0.0035 Torr....
A new pressure-calibration method for calibrating the reduction of second harmonic (2 f ) amplitude caused by pressure broadening effect in sealed microbial growth environment is present. The combines with linewidth compensation and modulation depth makes 2 accurately retrieve metabolic CO growth. In order to verify method, a simulation experiment developed, which increasing concentration leads pressure. Comparing relation between traditional gas concentration, there monotonous calibrated...