Simultaneous atmospheric nitrous oxide, methane and water vapor detection with a single continuous wave quantum cascade laser

Cao, Yanguang; Sanchez, Nancy P.; Jiang, Wenzhe; Griffin, Robert J.; Xie, Feng; Hughes, Lawrence C.; Zah, Chung−En; Tittel, Frank K.

doi:10.1364/oe.23.002121

Cited by 115 publications

(41 citation statements)

References 23 publications

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“…QEPAS-based sensors have been demonstrated for the detection of numerous inorganic and organic trace gases using a variety of laser sources in the wavelength range that covers the ultraviolet8, visible9, near-infrared10, mid-infrared11 and the terahertz spectral regions1213. In recent years, several variants of QEPAS have been developed, including SO-QEPAS14, double acoustic micro-resonator (AmR) QEPAS15, intra-cavity QEPAS1617 and evanescent-wave QEPAS18.…”

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confidence: 99%

Beat frequency quartz-enhanced photoacoustic spectroscopy for fast and calibration-free continuous trace-gas monitoring

et al. 2017

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Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a sensitive gas detection technique which requires frequent calibration and has a long response time. Here we report beat frequency (BF) QEPAS that can be used for ultra-sensitive calibration-free trace-gas detection and fast spectral scan applications. The resonance frequency and Q-factor of the quartz tuning fork (QTF) as well as the trace-gas concentration can be obtained simultaneously by detecting the beat frequency signal generated when the transient response signal of the QTF is demodulated at its non-resonance frequency. Hence, BF-QEPAS avoids a calibration process and permits continuous monitoring of a targeted trace gas. Three semiconductor lasers were selected as the excitation source to verify the performance of the BF-QEPAS technique. The BF-QEPAS method is capable of measuring lower trace-gas concentration levels with shorter averaging times as compared to conventional PAS and QEPAS techniques and determines the electrical QTF parameters precisely.

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confidence: 99%

Beat frequency quartz-enhanced photoacoustic spectroscopy for fast and calibration-free continuous trace-gas monitoring

et al. 2017

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“…Trace gas detection techniques play an important role in the fields of environment, industry, aerospace, and medical technology [1][2][3][4][5]. Various optical sensing methods for atmospheric monitoring have been reported by numerous researchers [6][7][8][9][10]. Compared with other optical spectroscopic techniques, photoacoustic spectroscopy (PAS) technology is one of the most effective approaches for trace gas sensing, in which a microphone is employed to detect acoustic signals generated by the modulated optical radiation in a weakly absorbing gas [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Quartz Enhanced Photoacoustic Detection Based on an Elliptical Laser Beam

Shang

2020

Applied Sciences

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A quartz enhanced photoacoustic spectroscopy (QEPAS) sensor system based on an elliptical laser beam for trace gas detection was demonstrated. A Powell lens was exploited to shape the circular laser beam into an elliptical laser beam for the full utilization of the quartz tuning fork (QTF) prong spacing. Based on the finite element modeling (FEM) simulation software COMSOL, the distribution of acoustic pressure on QTF prongs with different beam shapes was simulated theoretically. The experimental results showed that the QEPAS signal based on the elliptical laser beam had a 1.4-fold improvement compared with the circular laser beam, resulting in a minimum detection limit of 418.6 ppmv and the normalized noise equivalent absorption (NNEA) of 1.51 × 10 −6 cm −1 W/ √Hz at atmospheric pressure.

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“…The commonly used electrochemical sensors, such as the commercially available MG811 from Winsen, have some inevitable shortcomings in sensing performances, including limited detection range, low accuracy, and high power consumption [7,8]. Among the detailed sensing technologies, like direct absorption spectroscopy (DAS) [9,10], photo-acoustic spectroscopy (PAS) [11], and tunable diode laser absorption spectroscopy (TDLAS) [12,13,14], because of its cost-effectiveness and feasibility in special applications in the environment of the greenhouse, the utilization of DAS sensing technology is reasonable and becoming increasingly popular.…”

Section: Introductionmentioning

confidence: 99%

Wireless Mid-Infrared Spectroscopy Sensor Network for Automatic Carbon Dioxide Fertilization in a Greenhouse Environment

Wang

Niu

Zheng

et al. 2016

Sensors

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In this paper, a wireless mid-infrared spectroscopy sensor network was designed and implemented for carbon dioxide fertilization in a greenhouse environment. A mid-infrared carbon dioxide (CO2) sensor based on non-dispersive infrared (NDIR) with the functionalities of wireless communication and anti-condensation prevention was realized as the sensor node. Smart transmission power regulation was applied in the wireless sensor network, according to the Received Signal Strength Indication (RSSI), to realize high communication stability and low-power consumption deployment. Besides real-time monitoring, this system also provides a CO2 control facility for manual and automatic control through a LabVIEW platform. According to simulations and field tests, the implemented sensor node has a satisfying anti-condensation ability and reliable measurement performance on CO2 concentrations ranging from 30 ppm to 5000 ppm. As an application, based on the Fuzzy proportional, integral, and derivative (PID) algorithm realized on a LabVIEW platform, the CO2 concentration was regulated to some desired concentrations, such as 800 ppm and 1200 ppm, in 30 min with a controlled fluctuation of <±35 ppm in an acre of greenhouse.

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Simultaneous atmospheric nitrous oxide, methane and water vapor detection with a single continuous wave quantum cascade laser

Cited by 115 publications

References 23 publications

Beat frequency quartz-enhanced photoacoustic spectroscopy for fast and calibration-free continuous trace-gas monitoring

Beat frequency quartz-enhanced photoacoustic spectroscopy for fast and calibration-free continuous trace-gas monitoring

Quartz Enhanced Photoacoustic Detection Based on an Elliptical Laser Beam

Wireless Mid-Infrared Spectroscopy Sensor Network for Automatic Carbon Dioxide Fertilization in a Greenhouse Environment

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