Quartz-Enhanced Photoacoustic Spectroscopy Based on the Four-Off-Beam Acoustic Micro-Resonator

Wang, Zongliang; Zhang, Qinduan; Chang, Jun; Tian, Cunwei; Tang, Longfei; Feng, Yujian; Zhang, Hao; Xiu-kun, Zhang

doi:10.1109/jlt.2020.2998848

Cited by 13 publications

(3 citation statements)

References 21 publications

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“…With the increase of application scenarios and market demands, the requirements for detection accuracy and types are also increasing. Recently, laser spectroscopy based gas sensing system, such as absorption spectroscopy [9,10], photothermal spectroscopy [11,12] and photoacoustic spectroscopy [13,14] have been widely used to detect and measure the concentration of trace gases. Quartz enhanced photoacoustic spectroscopy (QEPAS) is an effective gas sensor technology.…”

Section: Introductionmentioning

confidence: 99%

Intra-cavity QEPAS gas sensor based on fiber-ring laser for C2H2 detection

Zhang

et al. 2023

AOPC 2022: Infrared Devices and Infrared Technology; And Terahertz Technology and Applications

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Quartz enhanced photoacoustic spectroscopy (QEPAS) is a high performance trace gas detection technique that plays an important role in food safety, pollution monitoring and breath analysis applications. It is well known that the sensitivity of QEPAS gas detection system is proportional to excitation laser power and thus the performance of QEPAS-based sensors can benefit from the high output power levels achieved as a result of technology developments by the high power laser. This paper mainly introduces three kinds of QEPAS gas sensor based on fiber-ring laser.

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Section: Introductionmentioning

confidence: 99%

Intra-cavity QEPAS gas sensor based on fiber-ring laser for C2H2 detection

Zhang

et al. 2023

AOPC 2022: Infrared Devices and Infrared Technology; And Terahertz Technology and Applications

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“…Quartz-enhanced photoacoustic spectroscopy has been widely employed in trace gas sensing due to its immunity to environmental noise, high detection sensitivity and small size [1][2][3][4]. When modulated laser emission is in resonance with gas analyte, its successive non-radiative relaxation [5][6][7] can generate acoustic waves. Acoustic microresonators with appropriate configurations are usually employed to improve the photoacoustic sensitivity [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…When modulated laser emission is in resonance with gas analyte, its successive non-radiative relaxation [5][6][7] can generate acoustic waves. Acoustic microresonators with appropriate configurations are usually employed to improve the photoacoustic sensitivity [7][8][9]. The QEPAS signal is proportional to light intensity, while laser intensity-induced fluctuations could be eliminated with simple compensation process by synchronously measuring the laser intensity variation [10][11][12][13] using a photodetector or a power meter.…”

Section: Introductionmentioning

confidence: 99%

Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline

Chen

Hu²,

Líu³

et al. 2022

Front. Phys.

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A convenient method of light intensity correction for quartz-enhanced photoacoustic spectroscopy (QEPAS) using photothermal baseline is demonstrated. The laser beam passes through the prongs of the quartz tuning fork (QTF) and then focused on the root of the prongs. First harmonic (1f) analysis is utilized to process the simultaneously induced photoacoustic and photothermal signals. The optical path length for photothermal spectroscopy is minimized to millimeter level, yielding negligible gas absorption. The demodulated 1f signal can be regarded as the superposition of the photoacoustic signal and the non-absorption photothermal baseline. A good linear relationship (R2 = 0.999) is observed between amplitude of photothermal baseline and light intensity. QEPAS signal normalized by photothermal baseline shows a good immunity to light intensity variation. An excellent linear response between normalized QEPAS signal and gas concentration is achieved. According to the Allan deviation analysis, the minimum detection limit for CH4 is 0.31 ppm at an integration time of 1,200 s. With this strategy, the precise gas concentration and accurate light intensity of a QEPAS system can be simultaneously obtained with only a single QTF. Compared with the light intensity correction using a photodetector or a power meter, this method entails a low cost and small footprint. It is promising to mitigate the influence from light intensity drift in long-term field measurement of QEPAS systems.

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Highly-Sensitive H2O Sensor Exploiting a 1.39 μm Near-Infrared Distributed-Feedback Laser Diode

Lin

Wang

et al. 2022

J Russ Laser Res

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Quartz-Enhanced Photoacoustic Spectroscopy Based on the Four-Off-Beam Acoustic Micro-Resonator

Cited by 13 publications

References 21 publications

Intra-cavity QEPAS gas sensor based on fiber-ring laser for C2H2 detection

Intra-cavity QEPAS gas sensor based on fiber-ring laser for C2H2 detection

Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline

Highly-Sensitive H2O Sensor Exploiting a 1.39 μm Near-Infrared Distributed-Feedback Laser Diode

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