Compact sound-speed sensor for quartz enhanced photoacoustic spectroscopy based applications [PDF]
, 2015 A compact sound-speed sensor based on a phase difference method was developed. The sensor employs a U-shaped stainless steel tube with two holes located on its front and back ends, which serves as a sound wave guide.
Dong, Lei, Liu, Kun, Tittel, Frank K.
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Photoacoustic Techniques for Trace Gas Sensing Based on Semiconductor Laser Sources
Sensors, 2009 The paper provides an overview on the use of photoacoustic sensors based on semiconductor laser sources for the detection of trace gases. We review the results obtained using standard, differential and quartz enhanced photoacoustic techniques.
Vincenzo Spagnolo +3 more
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QEPAS based ppb-level detection of CO and N2O using a high power CW DFB-QCL [PDF]
, 2013 An ultra-sensitive and selective quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor platform was demonstrated for detection of carbon monoxide (CO) and nitrous oxide (N2O). This sensor used a stateof- the art 4.61 μm high power, continuous wave
Bauer +32 more
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Enhanced photoacoustic spectroscopy sensitivity through intra-cavity OPO excitation [PDF]
, 2018 We report an optical molecular gas sensor exhibiting high levels of selectivity and sensitivity. The outstanding sensitivity demonstrated by our technology is rooted in a novel combination of photoacoustic spectroscopy (PAS) operated within the cavity of
Polak, Adam, Stothard, David J.M.
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On-chip mid-infrared photothermal spectroscopy using suspended silicon-on-insulator microring resonators [PDF]
, 2016 Mid-infrared spectroscopic techniques rely on the specific "fingerprint" absorption lines of molecules in the mid-infrared band to detect the presence and concentration of these molecules.
Baets, Roel +5 more
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Compact all-fiber quartz-enhanced photoacoustic spectroscopy sensor with a 30.72 kHz quartz tuning fork and spatially resolved trace gas detection [PDF]
, 2016 An ultra compact all-fiber quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor using quartz tuning fork (QTF) with a low resonance frequency of 30.72 kHz was demonstrated.
He, Ying +5 more
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Miniaturized photoacoustic trace gas sensing using a raman fiber amplifier [PDF]
, 2015 This paper presents the development of a Raman fiber amplifier optical source with a maximum output power of 1.1 W centered around 1651 nm, and its application in miniaturized 3D printed photoacoustic spectroscopy (PAS) trace gas sensing of methane.
Bauer, Ralf +6 more
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All optical quartz-enhanced photoacoustic spectroscopy
Acta Physica Sinica, 2013 A trace gas sensor based on all optical quartz-enhanced photoacoustic spectroscopy (QEPAS) is designed and demonstrated. An extra detection light beam is added to the traditional QEPAS setup to convert the amplitude of vibration of the quartz tuning fork, which is proportional to the concentration of the target gas, into the variation of the detection ...
null Liu Yan-Yan +7 more
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Sub-parts-per-trillion level sensitivity in trace gas detection by cantilever-enhanced photo-acoustic spectroscopy [PDF]
, 2018 An exceptional property of photo-acoustic spectroscopy is the zero-background in wavelength modulation configuration while the signal varies linearly as a function of absorbed laser power.
Halonen, Lauri +3 more
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1D U-Net Enhanced QEPAS Sensor for Trace Water Vapor Detection
OpticsWe report a deep learning-assisted quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor for trace water vapor detection in air. A 1392 nm butterfly-packaged DFB laser is wavelength-modulated at f0/2, and the QEPAS signal is retrieved by second ...
Huiming Xiao +13 more
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