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The effect of speed of sound (SoS) on the performance of quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor was investigated. Methods to correct QEPAS signal and to minimize effect of SoS by the carrier gas was studied.
In the short space of 15years since their first demonstration, quantum cascade lasers have become the most useful sources of tunable mid-infrared laser radiation. This Letter describes these developments in laser technology and the burgeoning applications of quantum cascade lasers to infrared spectroscopy. We foresee the potential application of quantum cascade lasers in other areas of chemical physics...
A novel technique for detecting optical absorption in gases is demonstrated. The technique called resonant optothermoacoustic detection (ROTADE) is based on energy transfer from the optical beam area to a mechanical oscillator via molecular diffusion.
A novel spectroscopic technique was applied to detection of hydrazine vapor using two wide stripe diode lasers and a variation of QEPAS. Modulating lasers with 180 degrees phase shift resulted in >100 times background reduction.
We report wavelength modulated TDLAS/QEPAS trace gas sensors with reduced size, efficiency, and cost for use in environmental sensor networks and medical exposure monitors. CO2 measurements with a 2μm diode laser dissipate ≪1 W.
A sensor based on quartz enhanced photoacoustic spectroscopy was evaluated for the detection of trace levels of ethylene at atmospheric pressure using a fiber coupled DFB diode laser probing an absorption peak at 6177.15 cm−1.
We report wavelength modulated TDLAS/QEPAS trace gas sensors with reduced size, efficiency, and cost for use in environmental sensor networks and medical exposure monitors. CO2 measurements with a 2μm diode laser dissipate ≪1 W.
A sensor based on quartz enhanced photoacoustic spectroscopy was evaluated for the detection of trace levels of ethylene at atmospheric pressure using a fiber coupled DFB diode laser probing an absorption peak at 6177.15 cm−1.
H2S trace detection has been performed by means of DFB diode laser-based off-axis integrated cavity output spectroscopy (OA-ICOS) near 1571.6 nm. A minimum detectable concentration of 700 ppb (3??) was obtained.
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