A Rollar‐Type Resonant Photoacoustic Spectroscopy for Trace Gas Detection DOI Open Access
Yongjia Zhang, Guojie Wu, Zhenfeng Gong

et al.

Microwave and Optical Technology Letters, Journal Year: 2024, Volume and Issue: 66(12)

Published: Dec. 1, 2024

ABSTRACT This paper presents a miniature Rollar‐type resonant photoacoustic cell (RRPAC), consisting of two cylindrical cavities and buffer chamber. The finite element analysis the acoustic field distributions for RRPAC T‐type (TRPAC) is utilized, demonstrating that can produce greater signal than conventional TRPAC. A high sensitivity trace C 2 H spectroscopy (PAS) system successfully developed by combining cantilever beam‐based sensor as sensing unit high‐speed spectrometer demodulation with RRPAC. experimental results indicate 2f at first‐order resonance mode approximately 1.5 times TRPAC same concentration. gas detection limit PAS 40.7 ppb an averaging time 100 s. In comparison TRPAC, exhibits higher sensitivity, thus providing novel solution advancement system.

Language: Английский

Cantilever-Enhanced Fiber-Optic Photoacoustic Spectrophone for Low-Pressure Gas Detection DOI
Chenxi Li, Xiao Han, Min Guo

et al.

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

A cantilever-enhanced fiber-optic photoacoustic (PA) spectrophone is reported for trace gas detection at a low-pressure environment. cantilever-based Fabry–Perot (F–P) interferometer (FPI) utilized simultaneous measurement of air pressure and PA pressure. Since the cantilever resonance frequency follows linearly, fundamental intensity modulation (1f-IM) technique applied to scan response solid signal from tube wall absorption tracking in real time. The second-harmonic wavelength spectroscopy (2f-WMS) used measure wave resonance. According inverse restriction relationship on excitation detection, measured environment enhanced. target concentration corrected by pressure, which makes generally applicable under any experimental results indicate that normalized noise equivalent (NNEA) coefficients standard atmospheric 60 kPa are 2.2 × 10–9 2.0 cm–1·W·Hz–1/2, respectively. 0.1 ppm acetylene (C2H2) can be detected maximum relative error 10 C2H2 different pressures less than ±9% reduced ±2% when rises 70 ppm. In range 60–100 kPa, has extremely high accuracy stability, covering most ground scenes.

Language: Английский

Citations

5
Noncontact Fiber-Optic Cantilever-Enhanced Photoacoustic Spectroscopy DOI
Zhenfeng Gong, Guojie Wu, Jiawei Xing

et al.

Analytical Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 30, 2024

Conventional cantilever-enhanced photoacoustic spectroscopy (CEPAS) usually requires the cantilever to be in contact with gas, which limits its application dusty and corrosive gas sensing. To overcome this challenge, paper proposes noncontact fiber-optic (NCFO-CEPAS) for high-sensitivity trace analysis. A polyethylene film corrosion-resistant properties is affixed end of acoustic sensor, effect distance between sensor on sensitivity system analyzed by finite element Compared conventional CEPAS, NCFO-CEPAS has a lower background noise deviation. Besides, potential damage silicon beam gases can avoided as measured not beam, gap will blocked high dust environment. Experimental results show that detection limit C

Language: Английский

Citations

4
In-situ detection of dissolved C2H2/CH4 with frequency-division-multiplexed fiber-optic photoacoustic sensor DOI
Chenxi Li, Fengxiang Ma, Chun Sun

et al.

Sensors and Actuators B Chemical, Journal Year: 2025, Volume and Issue: 435, P. 137651 - 137651

Published: March 21, 2025

Language: Английский

Citations

0
Effects of H2O and SF6 on CO Molecular Relaxation in a Cantilever-Enhanced Fiber-Optic Photoacoustic Sensor DOI
Xinyu Zhao, Hongchao Qi, Yajie Zhang

et al.

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

The effects of H2O and SF6 on the relaxation rate CO molecules are studied using a fiber-optic photoacoustic sensor (FOPAS) that integrates resonant multipass cell with fiber cantilever. signal is enhanced by approximately 1 order magnitude under induction H2O. has high density compared to N2, which causes resonance frequency shift low frequency. responses CO/SF6 CO/N2 at tested without verify gas promoting effect process. impact increasing concentration manifests in three distinct stages, reflected gradual increase, sharp eventual saturation. corresponding ranges different stages 2000-12,000, 12,000-18,000, above 18,000 ppm, respectively. ratio precisely controlled, influence mechanism background mixture changes frequency, response, Q-factor studied. Furthermore, responsivity noise evaluated SF6. detection limits 10 ppb averaging times 100 400 s, makes this study applicable environment SF6, N2-SF6 mixtures as gas.

Language: Английский

Citations

0
Empirical Modal Decomposition Combined with Deep Learning for Photoacoustic Spectroscopy Detection of Mixture Gas Concentrations DOI
Zhenfeng Gong,

Yeming Fan,

Yuchen Guan

et al.

Analytical Chemistry, Journal Year: 2024, Volume and Issue: 96(46), P. 18528 - 18536

Published: Nov. 7, 2024

In photoacoustic spectroscopy based multicomponent gas analysis, the overlap of absorption spectra among different gases can affect measurement accuracy concentrations. We report a analysis method on empirical modal decomposition (EMD), convolutional neural networks (CNN), and long short-term memory (LSTM) that extract exact concentrations mixed from overlapping wavelength-modulated with second harmonic (WMS-2f) detection. The WMS-2f signals 25 concentration combinations acetylene-ammonia mixtures are detected using single distributed feedback laser (DFB) at 1531.5 nm. acetylene range 2.5 to 7.5 ppm ammonia 12.5 37.5 ppm. data set is enhanced by cyclic shifting adding Gaussian noise. classification test reaches 99.89% after tuning. mean absolute errors five additional sets measured under conditions 0.092 for 1.902 ammonia, within above ranges.

Language: Английский

Citations

2
ppb-Level SO2 Photoacoustic Sensor for SF6 Decomposition Analysis Utilizing a High-Power UV Laser with a Power Normalization Method DOI Creative Commons

Xiu Yang,

Baisong Chen,

Yuyang He

et al.

Sensors, Journal Year: 2024, Volume and Issue: 24(24), P. 7911 - 7911

Published: Dec. 11, 2024

A highly sensitive sulfur dioxide (SO2) photoacoustic gas sensor was developed for the hexafluoride (SF6) decomposition detection in electric power systems by using a novel 266 nm low-cost high-power solid-state pulse laser and high Q-factor differential cell. The ultraviolet (UV) is based on passive Q-switching technology with output of 28 mW. signal normalized to solve fluctuation due instability UV laser. cell can obtain reduce flow noise SF6 buffer gas. parameters SO2 system were optimized terms operating pressure. 1σ limit (SNR = 1) 2.34 ppb achieved 1 s integration time, corresponding equivalent absorption (NNEA) coefficient 7.62 × 10−10 cm−1WHz−1/2.

Language: Английский

Citations

1
Improved T-shaped quartz tuning fork with isosceles-trapezoidal grooves optimized for quartz-enhanced photoacoustic spectroscopy DOI Creative Commons

Feihu Fang,

Runqiu Wang,

D. B. Shao

et al.

Photoacoustics, Journal Year: 2024, Volume and Issue: 41, P. 100672 - 100672

Published: Nov. 26, 2024

The quartz tuning fork (QTF) being the acoustic-electrical conversion element for quartz-enhanced photoacoustic spectroscopy (QEPAS) system directly affects detection sensitivity. However, low electromechanical efficiency characteristic of standard QTF limits further enhancement system. Therefore, optimized design is becoming an important approach to improve performance QEPAS. In this work, 9 kHz T-shaped QTFs with isosceles-trapezoidal grooves are firstly applied gas sensing experiments. Four types fabricated and Simulation results reveal conducive optimizing stress distribution enhancing efficiency. experiment (acetylene C

Language: Английский

Citations

0
A Rollar‐Type Resonant Photoacoustic Spectroscopy for Trace Gas Detection DOI Open Access
Yongjia Zhang, Guojie Wu, Zhenfeng Gong

et al.

Microwave and Optical Technology Letters, Journal Year: 2024, Volume and Issue: 66(12)

Published: Dec. 1, 2024

ABSTRACT This paper presents a miniature Rollar‐type resonant photoacoustic cell (RRPAC), consisting of two cylindrical cavities and buffer chamber. The finite element analysis the acoustic field distributions for RRPAC T‐type (TRPAC) is utilized, demonstrating that can produce greater signal than conventional TRPAC. A high sensitivity trace C 2 H spectroscopy (PAS) system successfully developed by combining cantilever beam‐based sensor as sensing unit high‐speed spectrometer demodulation with RRPAC. experimental results indicate 2f at first‐order resonance mode approximately 1.5 times TRPAC same concentration. gas detection limit PAS 40.7 ppb an averaging time 100 s. In comparison TRPAC, exhibits higher sensitivity, thus providing novel solution advancement system.

Language: Английский

Citations

0