A5058473667- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Laser Design and Applications
- Analytical Chemistry and Sensors
- Gas Sensing Nanomaterials and Sensors
- Advanced Chemical Sensor Technologies
- Electric Power Systems and Control
- Induction Heating and Inverter Technology
- Molecular Spectroscopy and Structure
- Diverse Industrial Engineering Technologies
- Photonic and Optical Devices
- Advanced Chemical Physics Studies
- Semiconductor Lasers and Optical Devices
- Water Quality Monitoring and Analysis
- Spectroscopy and Quantum Chemical Studies
- Mechanical and Optical Resonators
- Atomic and Subatomic Physics Research
- Engineering Technology and Methodologies
- Nonlinear Photonic Systems
- Photochemistry and Electron Transfer Studies
- Force Microscopy Techniques and Applications
- Advanced Research in Systems and Signal Processing
- Ergonomics and Human Factors
- Optical and Acousto-Optic Technologies
Institute of Agrarian Problems
2016
Yuri Gagarin State Technical University of Saratov
2012
Rice University
2002-2011
Institute of Spectroscopy
1992-2010
Russian Academy of Sciences
1995
A new approach to detecting a weak photoacoustic signal in gas medium is described. Instead of gas-filled resonant acoustic cavity, the sound energy accumulated high-Q crystal element. Feasibility experiments utilizing quartz-watch tuning fork demonstrate sensitivity 1.2×10-7 cm-1 W/Hz. Potential further developments and applications this technique are discussed.
There is an increasing need in many chemical sensing applications ranging from industrial process control to environmental science and medical diagnostics for fast, sensitive, selective gas detection based on laser spectroscopy. The recent availability of novel pulsed CW quantum cascade distributed feedback (QC-DFB) lasers as mid-infrared spectroscopic sources address this need. A number techniques have been demonstrated worldwide by several groups. For example, the authors employed QC-DFB...
A quantum-cascade laser operating at a wavelength of 8.1 µm was used for high-sensitivity absorption spectroscopy methane CH4. The frequency continuously scanned with current over more than 3 cm-1, and spectra the CH4?4P branch were recorded. measured linewidth 50 MHz. CH4 concentration 15.6 parts in 106 ppm Torr air 43-cm path length ±0.5?ppm accuracy when signal averaged 400 scans. minimum detectable such direct measurements is estimated to be 1.1×10-4. content 13CH4 CH3D species sample determined.
A continuous wave optical parametric oscillator, generating up to 300 mW idler output in the 3–4 μm wavelength region, and pumped by a fiber-amplified DBR diode laser is used for trace gas detection means of quartz-enhanced photoacoustic spectroscopy (QEPAS). Mode-hop-free tuning OPO over 5.2 cm-1 spectral coverage exceeding 16.5 were achieved via electronic pump source alone. Online monitoring wavelength, with feedback laser, provided an automated closed-loop control allowing arbitrary...
A microphotoacoustic highly selective sensor of ammonia is built. Main attention paid to the operation mechanism acoustic based on a quartz tuning fork. The optimal dimensions and configuration resonator are determined, which made it possible increase sensitivity by two—three times compared existing devices. detector for was 60ppb (0.05 mg m-3) measurement time 10s 25-mW, 1.53-μm laser beam in resonator.
Recent developments of external cavity quantum cascade lasers (EC-QC lasers) enable new applications in laser spectroscopy trace gas species the mid-infrared spectral region. We report application quartz enhanced photo acoustic (QEPAS) with widely tuneable EC-QC as excitation sources for chemical sensing different such triacetone triperoxide (TATP). A pulsed operating at v∼1120cm-1 and a cw v∼950cm-1 are used detection explosive TATP which is mid infrared broad band absorber. The limit our...