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

и другие.

Analytical Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Янв. 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.

Язык: Английский

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

и другие.

Analytical Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Янв. 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.

Язык: Английский

Процитировано

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