Multi-mechanism collaboration enhanced photoacoustic analyzer for trace H2S detection

Guo, Min; Zhao, Xinyu; Chen, Ke; Cui, Dongyu; Zhang, Guangyin; Li, Chenxi; Gong, Zhenfeng; Yu, Qingxu

doi:10.1016/j.pacs.2023.100449

Cited by 17 publications

(12 citation statements)

References 49 publications

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“…On the basis of the principle of wavelength modulation spectroscopy, the second‐harmonic signal first increases and then decays with the increase of DFB laser modulation current 42,43 . By utilizing the optimal modulation current parameters, the detection sensitivity to C 2 H 2 gas can be effectively improved.…”

Section: Experimental Results and Simulationmentioning

confidence: 99%

“…The T-type cell has only one buffer chamber, which is different from the symmetrical structure of the traditional H-type cell. The first-order longitudinal resonance frequency f 1 and the PA cell constant F 1 of the T-type cell are [38][39][40] :…”

Section: Designing Of T-shaped Pa Cellmentioning

confidence: 99%

“…laser modulation current. 42,43 By utilizing the optimal modulation current parameters, the detection sensitivity to C 2 H 2 gas can be effectively improved. The sinusoidal modulation current of the DFB laser was gradually increased from 0.5 to 8 mA.…”

Section: Optimizing Parametersmentioning

confidence: 99%

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Rapid detection of dissolved acetylene in oil based on T‐type photoacoustic cell

Wang

Dehui

Yuan

et al. 2023

Micro & Optical Tech Letters

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Aiming at the need of rapid and sensitive detection of acetylene dissolved in oil, a small‐volume T‐type photoacoustic (PA) cell was proposed. By optimizing the design parameters, the volume of the T‐type cell was reduced to 30 mL, which resulted in a significant reduction in the sampling amount of the transformer oil. A laser PA spectroscopy system for dissolved gas analysis was built combined with the headspace degassing method. A near‐infrared tunable laser with wavelength modulation spectroscopy was employed to detect the escaped acetylene gas from oil. Test results show that the detection limit of dissolved acetylene reaches 0.2 μL/L when the sampled oil volume is 50 mL. In addition, the degassing balance time can be shortened to 270 s. This scheme has the superiority of small oil extraction volume, high accuracy, and short response time, providing a new method for analyzing the dissolved characteristic gases in oil.

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Section: Experimental Results and Simulationmentioning

confidence: 99%

Section: Designing Of T-shaped Pa Cellmentioning

confidence: 99%

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Rapid detection of dissolved acetylene in oil based on T‐type photoacoustic cell

Wang

Dehui

Yuan

et al. 2023

Micro & Optical Tech Letters

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“…For the first-order longitudinal resonant PAC, F represents the ability of the PA system to convert the light energy absorbed by the gas into acoustic wave, which is only related to the dimensional parameters of the PAC and Q -factor: F = 2 Q ( γ − 1 ) L normalc R normalc 2 π 3 v normalc where L c and R c represent the length and radius of the resonator, respectively. γ and v c represent the specific heat capacity and sound speed of the sample gas, respectively.…”

Section: Detection Principle and Theoretical Analysis Of H2s Pa Sensormentioning

confidence: 99%

Multi-pass Differential Photoacoustic Sensor for Real-Time Measurement of SF₆Decomposition Component H₂S at the ppb Level

et al. 2023

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We designed and implemented a photoacoustic (PA) sensor for H 2 S detection in SF 6 background gas based on a multi-pass differential photoacoustic cell (MDPC) and a near-infrared distributed feedback (DFB) laser. In the MDPC apparatus, two resonators with identical geometric parameters were vertically and symmetrically embedded. The differential processing algorithm of two phase-reversed signals realized the effective enhancement of the PA signal and suppressed the flow noise in the dynamic sampling process. In addition, the λ/4 buffer chamber in the MDPC was utilized as a muffler to further reduce the flow noise and realize the dynamic detection of H 2 S. The collimated excitation light was reflected 30 times in a multi-pass structure constituted of two gold-plated concave mirrors, and an absorption path length of 4.92 m was achieved. Due to the high gas density of SF 6 , the relationship between the signal-to-noise ratio (SNR) and the gas flow was different between SF 6 and N 2 background gases. The maximum flow rate of the characteristic gas components detected in the SF 6 background is 150 standard cubic centimeters per minute (SCCM), which is lower than 350 SCCM in N 2 . The linearity property was analyzed, and the results show that the sensitivity of the sensor to H 2 S in the SF 6 background was 27.3 μV/ppm. With the structure, parameters, temperature, gas flow, and natural frequency of the MDPC been optimized, a minimum detection limit (MDL) of 11 ppb was reached with an averaging time of 1000 s, which furnished an effective preventive implement for the safe operation of gas insulation equipment.

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“…The detection limit of H 2 S gas in the SF 6 background was 10.96 ppb. 29 As the background gas of H 2 S, SF 6 has a particularity of high density, which leads to a sharp increase in gas flow noise. The differential photoacoustic cell 30,31 (DPAC), which is composed of two resonators, overcame this problem.…”

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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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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Multi-mechanism collaboration enhanced photoacoustic analyzer for trace H2S detection

Cited by 17 publications

References 49 publications

Rapid detection of dissolved acetylene in oil based on T‐type photoacoustic cell

Rapid detection of dissolved acetylene in oil based on T‐type photoacoustic cell

Multi-pass Differential Photoacoustic Sensor for Real-Time Measurement of SF₆Decomposition Component H₂S at the ppb Level

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

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Multi-mechanism collaboration enhanced photoacoustic analyzer for trace H2S detection

Cited by 17 publications

References 49 publications

Rapid detection of dissolved acetylene in oil based on T‐type photoacoustic cell

Rapid detection of dissolved acetylene in oil based on T‐type photoacoustic cell

Multi-pass Differential Photoacoustic Sensor for Real-Time Measurement of SF6Decomposition Component H2S at the ppb Level

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

Contact Info

Product

Resources

About

Multi-pass Differential Photoacoustic Sensor for Real-Time Measurement of SF₆Decomposition Component H₂S at the ppb Level