Multiplexed fiber-optic photoacoustic sensors for simultaneous detection of multi-point gases

Li, Chenxi; Han, Xiao; Ma, Fengxiang; Zhao, Xinyu; Wang, Zhengzhi; Qi, Hongchao; Guo, Min; Chen, Ke

doi:10.1016/j.snb.2023.134801

Cited by 40 publications

(16 citation statements)

References 37 publications

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“…The cavity length difference between two fiber-optic cantilever microphones is determined by considering crosstalk and demodulation resolution. 36 Due to the Gibbs effect caused by finite sampling; a too-small cavity length difference will cause crosstalk between two fiber-optic cantilever microphones. The cavity length difference between two fiber-optic cantilever microphones is generally greater than 200 μm, which suppresses the degree of crosstalk.…”

Section: ■ Principle and Design Application Of Photoacoustic Excitati...mentioning

confidence: 99%

“…The WLI demodulation method is insensitive to the fluctuation of light source power and the change in fiber optic transmission loss, which is beneficial to realize the absolute measurement with high precision and stability. The cavity length difference between two fiber-optic cantilever microphones is determined by considering crosstalk and demodulation resolution . Due to the Gibbs effect caused by finite sampling; a too-small cavity length difference will cause crosstalk between two fiber-optic cantilever microphones.…”

Section: Principle and Design Application Of Photoacoustic Excitation...mentioning

confidence: 99%

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Ultrahigh Sensitive Trace Gas Sensing System with Dual Fiber-Optic Cantilever Multiplexing-Based Differential Photoacoustic Detection

Zhao,

Wang,

et al. 2024

Anal. Chem.

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An ultrahigh sensitive trace gas sensing system was presented with dual cantilever-based differential photoacoustic detection. By combining the double enhancement of multipass absorption and optical differential detection, the gas detection sensitivity was significantly improved. The dualchannel synchronous photoacoustic detection was realized by fiber-optic Fabry−Perot interference spectrum multiplexing. The photoacoustic signals detected by two fiber-optic cantilever microphones installed in a differential photoacoustic cell (DPAC) were out of phase, while the detected gas flow noises were in phase. The optical differential detection method achieved both highly sensitive optical interference measurement and differential noise suppression. In the multipass configuration, the interaction path between excitation light and target gas achieved 4.1 m, which improved the photoacoustic signal by an order of magnitude compared with a single reflection. The maximum gas flow allowed by the system based on the DPAC was 250 sccm, which realized the dynamic monitoring of H 2 S in the SF 6 background. The detection limit for H 2 S in SF 6 background was 5.1 ppb, which corresponds to the normalized noise equivalent absorption coefficient of 9 × 10 −10 cm −1 W Hz −1/2 .

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Section: ■ Principle and Design Application Of Photoacoustic Excitati...mentioning

confidence: 99%

Section: Principle and Design Application Of Photoacoustic Excitation...mentioning

confidence: 99%

Ultrahigh Sensitive Trace Gas Sensing System with Dual Fiber-Optic Cantilever Multiplexing-Based Differential Photoacoustic Detection

Zhao,

Wang,

et al. 2024

Anal. Chem.

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“…Photoacoustic (PA) spectroscopy (PAS) is one of the most promising methods for trace gas detection. − Compared with the methods mentioned above, PAS has the advantages of high sensitivity, fast response, and portability. − There are a number of PAS systems used to detect NO 2 . − Saarela et al used ten light-emitting diodes (LEDs) to excite the PA signal in NO 2 . The total optical power of the LEDs was 9 W. A detection limit of 10 ppb was achieved by using two pressure transducers with an acquisition time of 2.1 s. However, the divergence angle of the LEDs is approximately 100°.…”

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confidence: 99%

High-Precision Photoacoustic Nitrogen Dioxide Gas Analyzer for Fast Dynamic Measurement

Qi,

Zhang,

et al. 2024

Anal. Chem.

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A high-precision photoacoustic (PA) gas analyzer for fast dynamic measurement of ambient nitrogen dioxide (NO2) was developed. The PA analyzer used a differential PA cell combined with two mufflers to achieve rapid gas flow gas detection. A high-power laser diode (LD) with a center wavelength of 450 nm was used as the PA signal excitation source. To reduce the saturated absorption effect of NO2, ambient air was pumped into the analyzer at a flow rate of 900 sccm. Two mufflers were combined with the differential PA cell to reduce the noise caused by the airflow and pump. The parameters of the mufflers were optimized by using a finite element method. The experimental results showed that the gas flow noise was suppressed by 95%. The response time of the PAS analyzer was 34 s. The detection limits of the analyzer were 0.64 and 0.17 ppb when the integration times were 1 and 15 s, respectively. A 120 h continuous monitoring result was compared with the data from the National Environmental Monitoring Station to demonstrate the high reliability of the analyzer.

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“…Fiber-optic PA sensors integrated the F–P cavity into the PA cell and used the fibers to transmit the excitation light and detection light. − Moreover, the volume of the gas chamber can be reduced to the microliter level. A miniaturized cantilever-enhanced fiber-optic PA sensor detected PA signals through a cantilever beam, which can greatly improve the detection sensitivity. − In practical application, due to fiber bending, fiber transmission loss, and end face fouling, the transmitted light intensity will inevitably be affected, which leads to serious concentration measurement error.…”

mentioning

confidence: 99%

High-Precision Multipass Fiber-Optic Photoacoustic Gas Analyzer Based on 2f/1f Wavelength Modulation Spectroscopy

Xu,

Wang,

et al. 2024

Anal. Chem.

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Multiplexed fiber-optic photoacoustic sensors for simultaneous detection of multi-point gases

Cited by 40 publications

References 37 publications

Ultrahigh Sensitive Trace Gas Sensing System with Dual Fiber-Optic Cantilever Multiplexing-Based Differential Photoacoustic Detection

Ultrahigh Sensitive Trace Gas Sensing System with Dual Fiber-Optic Cantilever Multiplexing-Based Differential Photoacoustic Detection

High-Precision Photoacoustic Nitrogen Dioxide Gas Analyzer for Fast Dynamic Measurement

High-Precision Multipass Fiber-Optic Photoacoustic Gas Analyzer Based on 2f/1f Wavelength Modulation Spectroscopy

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