Photoacoustic spectroscopy-based ppb-level multi-gas sensor using symmetric multi-resonant cavity photoacoustic cell

Article Optics

Modified laser scanning technique in wavelength modulation spectroscopy for advanced TDLAS gas sensing

Botao Deng et al.

Summary: This paper proposes a modified laser scanning technique for TDLAS gas sensors, which allows for real-time monitoring and in-situ control of laser wavelength stability. By utilizing half-wave and nonlinear scanning, more accurate and stable measurement results can be achieved.

OPTICS AND LASERS IN ENGINEERING (2022)

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Article Acoustics

Ultra-sensitive ppb-level methane detection based on NIR all-optical photoacoustic spectroscopy by using differential fiber-optic microphones with gold-chromium composite nanomembrane

Hanping Xiao et al.

Summary: This paper proposes and demonstrates an ultra-sensitive all-optical PAS gas sensor using a near-infrared diode laser, fiber-optic microphones, and a double channel differential T-type photoacoustic cell. The sensor shows high sensitivity and a flat frequency response, making it suitable for CH4 detection with a low minimum detection limit.

PHOTOACOUSTICS (2022)

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Article Acoustics

Small-volume highly-sensitive all-optical gas sensor using non-resonant photoacoustic spectroscopy with dual silicon cantilever optical microphones

Lujun Fu et al.

Summary: A small-volume highly-sensitive photoacoustic spectroscopy methane detection system based on differential silicon cantilever optical microphones is proposed and experimentally demonstrated. The system shows high displacement sensitivity, stability, and noise resistance, making it suitable for applications in medicine, industry, and the environment.

PHOTOACOUSTICS (2022)

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Article Chemistry, Multidisciplinary

A Dual-Gas Sensor Using Photoacoustic Spectroscopy Based on a Single Acoustic Resonator

Yiming Jiang et al.

Summary: A dual-gas photoacoustic spectroscopy sensor based on wavelength modulation spectroscopy was developed to simultaneously measure NH3 and CH4 with distributed feedback laser diodes. This sensor offers advantages of multi-wavelength operation, simple structure, and cost-effectiveness.

APPLIED SCIENCES-BASEL (2021)

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Article Biochemistry & Molecular Biology