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Small-size resonant photoacoustic cell with reduced window background for laser detection of gases
A photoacoustic resonant cell with the inner volume is ∼0.5 cm 3 is presented. The shape of the cell cavity is chosen such as to minimize a background...
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Modulated resonant versus pulsed resonant photoacoustics in trace gas detection
Modulated resonant photoacoustics is a sensitive technique widely used for trace gas sensing. Generally, a continuous-wave laser is modulated at a...
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The potential of CO2 laser photoacoustic spectrometry for detection of methanol in alcoholic beverage
The first use of CO 2 laser photoacoustic measurements for detecting the methanol contents in alcohol-like solutions is presented. With an intracavity...
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QEPAS methane sensor performance for humidified gases
A trace gas sensor based on quartz enhanced photoacoustic spectroscopy (QEPAS) was evaluated using humidified nitrogen samples and ambient air....
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Investigation of the structure and the physical properties of nickel-phosphorus ultra-black surfaces
Ultra-black materials with low reflectivity can be applied in many fields of science and technology. We deposited nickel-phosphorus alloys (Ni-P) on...
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Simultaneous determination of the spatial profile of the laser beam and vibrational-to-translational relaxation time by pulsed photoacoustics
Measuring the vibrational-to-translational relaxation time τ V-T in gases is one of the applications of pulsed photoacoustic spectroscopy....
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Cantilever enhanced photoacoustic detection of carbon dioxide using a tunable diode laser source
Recently introduced cantilever enhanced photoacoustic sensing has been applied to the tunable diode laser-based trace gas detection. The pressure...
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A sensitivity comparison of three photoacoustic cells containing a single microphone, a differential dual microphone or a cantilever pressure sensor
Three photoacoustic (PA) cells designed for trace-gas sensing were compared by measuring absorption by the P (15) rotational line of the
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Carbon dioxide and ammonia detection using 2 μm diode laser based quartz-enhanced photoacoustic spectroscopy
Quartz-enhanced photoacoustic spectroscopy was employed for trace gas concentration measurements of CO 2 and NH 3 using a continuous wave...
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Photoacoustic detection of NO2 and N2O using quantum cascade lasers
Pulsed quantum cascade lasers (QCLs) with 6.2-μm and 8-μm wavelengths and a differential photoacoustic (PA) detector were used to measure...
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Photoacoustic detection of oxygen using cantilever enhanced technique
A tunable diode laser photoacoustic setup based on a recently demonstrated cantilever technique was used for sensitive detection of oxygen. As light...
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Influence of molecular relaxation dynamics on quartz-enhanced photoacoustic detection of CO2 at
λ =2 μmCarbon dioxide (CO 2 ) trace gas detection based on quartz enhanced photoacoustic spectroscopy (QEPAS) using a distributed feedback diode laser...
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Impact of humidity on quartz-enhanced photoacoustic spectroscopy based detection of HCN
The architecture and operation of a trace hydrogen cyanide (HCN) gas sensor based on quartz-enhanced photoacoustic spectroscopy and using a λ=1.53 μm...
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The potential of mid-infrared photoacoustic spectroscopy for the detection of various do** agents used by athletes
The feasibility of laser-photoacoustic measurements for the detection and the analysis of different isolated do** agents in the vapour phase is...
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Photoacoustic system for on-line process monitoring of hydrogen sulfide (H2S) concentration in natural gas streams
A dual-channel hydrogen sulfide (H 2 S) concentration measuring system based on photoacoustic spectroscopy is described. The system uses a single-mode,...
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Optical parametric oscillator-based photoacoustic detection of CO2 at 4.23 μm allows real-time monitoring of the respiration of small insects
A continuous wave, single frequency and continuously tunable optical parametric oscillator is used in combination with photoacoustic spectroscopy to...
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Room-temperature diode laser photoacoustic spectroscopy near 2.3 μm
We describe results obtained with a new type of GaSb-based semiconductor distributed feedback multiple quantum well lasers operating in...
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Theory of two-photon photothermal deflection spectroscopy in stationary and flowing media for arbitrary optical pulse length
A general theory of pulsed two-photon photothermal deflection spectroscopy (PTDS) is presented. We find that there are significant enough differences...
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Photoacoustic detection of ozone using a quantum cascade laser
A 9.5-μm pulsed quantum cascade laser (QCL) and a differential photoacoustic (PA) detector were used to measure trace concentrations of ∼100 ppbv...