Detection of Molecular Oxygen at Low Concentrations Using Quartz Enhanced Photoacoustic Spectroscopy
نویسندگان
چکیده
منابع مشابه
Detection of Molecular Oxygen at Low Concentrations Using Quartz Enhanced Photoacoustic Spectroscopy
Molecular oxygen is detected at low concentrations using photoacoustic spectroscopy despite its unfavorable photoacoustic properties. The system consists of a seed laser diode, a tapered amplifier and a quartz tuning fork based spectrophone, thus employing quartz enhanced photoacoustic spectroscopy (QEPAS). With this system a detection limit of 13 ppm is reached with a compact and long term sta...
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A new approach to detecting a weak photoacoustic signal in a gas medium is described. Instead of a gas-filled resonant acoustic cavity, the sound energy is accumulated in a high- Q crystal element. Feasibility experiments utilizing a quartz-watch tuning fork demonstrate a sensitivity of 1.2x10(-7) cm(-1) W/ radicalHz . Potential further developments and applications of this technique are discus...
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A detailed review on the development of quartz-enhanced photoacoustic sensors (QEPAS) for the sensitive and selective quantification of molecular trace gas species with resolved spectroscopic features is reported. The basis of the QEPAS technique, the technology available to support this field in terms of key components, such as light sources and quartz-tuning forks and the recent developments ...
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A trace gas sensor based on quartz-enhanced photoacoustic spectroscopy with a quantum cascade laser operating at 4.55 μm as an excitation source was developed. The sensor performance was evaluated for the detection of N2O and CO. A noise-equivalent (1σ) sensitivity of 4 ppbv N2O with 3 s response time to (1−1/e) of the steady-state level was demonstrated. The influence of the relevant energy tr...
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Quartz-enhanced photoacoustic spectroscopy was employed for trace gas concentration measurements of CO 2 and NH 3 using a continuous wave thermoelectrically cooled, distributed feedback diode laser operating at 2 µm. A normalized noise equivalent absorptionvspace1pt coefficient, NNEA(1σ) = 1.4 × 10 −8 cm −1 W/ √ Hz was obtained for CO 2 using the R18 line of the 2ν 1 + ν 3 band at 4991.26 cm −1...
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ژورنال
عنوان ژورنال: Sensors
سال: 2010
ISSN: 1424-8220
DOI: 10.3390/s100908466