Identifying gas composition based on the decomposed relaxation strength from sound-speed dispersion

Liu, Shuangling; Zhu, Ming; Yang, Jingjing; Wu, Jiaying

doi:10.1016/j.apacoust.2023.109264

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…Furthermore, the small signal of acoustic relaxation absorption submerged in large classical relaxation signal and noise is difficult to be measured in the high-frequency range. The above problems can be avoided by measuring sound speeds which have many advantages, such as high accuracy [21][22][23], fast response [24]- [26], and no requirement for complex equipment [27][28][29][30]. However, traditional methods for measuring sound speeds are based on the average molecular weight of gases and fail to acquire other molecular relaxation features.…”

Section: Introductionmentioning

confidence: 99%

Extracting relaxational features from measurements of sound speeds for gas sensing

Zhang,

Pan

et al. 2023

J. Inst.

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In recent years, gas sensing methods by jointly measuring acoustic relaxation absorption and sound speeds have become a research focus in acoustic fields. However, the existing methods are difficult to be employed in practical gas detection due to complex measurement processes and large measurement errors when measuring the sound relaxational absorption. Furthermore, the acoustic relaxation absorption spectrum's small signal is hard to be measured because of the noise and large classical relaxation in the high-frequency range. In this paper, a gas sensing method is proposed by only measuring the sound speeds at the three frequencies, avoiding the problems of measuring the acoustic absorption spectrum. First, sound speeds are measured at three frequency points; second, the relaxation strength and the relaxation time of the acoustic relaxation features are extracted; finally, the absorption spectral peak is acquired and located for gas detection. The simulation results verify the feasibility of our method, and the detection errors from the measurement errors of sound speeds can be eliminated effectively. Thus, our work provides a high-accurate and simple acoustic method for gas sensing.

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Section: Introductionmentioning

confidence: 99%

Extracting relaxational features from measurements of sound speeds for gas sensing

Zhang,

Pan

et al. 2023

J. Inst.

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“…1 Therefore, the solution or even concentrated dispersion can be characterized by acoustic spectroscopy. Acoustics has been widely used in gas sensing 2 and underwater sensor networks. 3−6 Sound speed measurements have been used to determine the energy loss in a liquid sample.…”

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confidence: 99%

“…Therefore, the solution or even concentrated dispersion can be characterized by acoustic spectroscopy. Acoustics has been widely used in gas sensing and underwater sensor networks. − Sound speed measurements have been used to determine the energy loss in a liquid sample . Millero et al reported positive transitions in the speed of sound in certain concentrated aqueous solutions, largely attributed to the hydration layer of cations .…”

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confidence: 99%

Cations and Anions Affect the Speed of Sound in Water Oppositely

Jiang,

van de Ven

2024

J. Phys. Chem. Lett.

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Identifying the composition of a solution using acoustics remains a challenge. It is known that for low salt concentrations the speed of sound in water increases linearly with the concentration of the electrolyte, but the contribution of individual cations and anions is unknown. We introduce the concept of intrinsic sound speed A i to quantify the contribution of ions to the speed of sound. We found that cations increase the speed of sound in water whereas anions decrease the speed of sound. Hydration layers around the ions play a major role. Because cations have a hydration layer thicker than that of anions, their contribution to the speed of sound is larger than that of anions. Experimental data on salts not used to determine the contribution of individual ions are in quantitative agreement with the predicted values. Our method can be applied to various systems containing small quantities of ions, molecules, or particles. With the knowledge that cations increase the speed of sound, we were able to explain previously unexplained data in the literature.

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Gas leak detection system in compressor stations based on a microphone array and multi-channel frequency Transformer

Liu

Mei

Wang³

et al. 2023

Measurement

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Identifying gas composition based on the decomposed relaxation strength from sound-speed dispersion

Cited by 5 publications

References 29 publications

Extracting relaxational features from measurements of sound speeds for gas sensing

Extracting relaxational features from measurements of sound speeds for gas sensing

Cations and Anions Affect the Speed of Sound in Water Oppositely

Gas leak detection system in compressor stations based on a microphone array and multi-channel frequency Transformer

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