A Direct Measurement of the C<sub>2</sub>H<sub>2</sub> Concentration from the C<sub>2</sub>H<sub>2</sub>–Oil Mixed Solution Using the Photoacoustic Spectroscopy Method

A Direct Measurement of the C<sub>2</sub>H<sub>2</sub> Concentration from the C<sub>2</sub>H<sub>2</sub>–Oil Mixed Solution Using the Photoacoustic Spectroscopy Method

The photoacoustic (PA) method is commonly used in the measurement of trace gas concentration owing to its high accuracy and reliability. However, the conventional PA method is usually used in the gas-phase environment, which leads to a long measurement time and a large equipment volume for the degas...

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Bibliographic Details
Main Authors: Zikang Rong, Jian Ke, Haifei Lu, Xiaoyan Wen, Lijie Li, Zhiwen Ming, Shuo Deng, Min Li
Format: Article
Language:English
Published: MDPI AG 2025-05-01
Series:Photonics
Subjects:
photoacoustic spectroscopy
gas–liquid mixed solution
direct measurement
acetylene concentration
Online Access:https://www.mdpi.com/2304-6732/12/5/471
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Summary:The photoacoustic (PA) method is commonly used in the measurement of trace gas concentration owing to its high accuracy and reliability. However, the conventional PA method is usually used in the gas-phase environment, which leads to a long measurement time and a large equipment volume for the degassing process. In this paper, we report a scheme to measure the acetylene (C<sub>2</sub>H<sub>2</sub>) concentration from the acetylene–dielectric oil (C<sub>2</sub>H<sub>2</sub>–Oil) mixed solution without the degassing process. The frequency and intensity distribution of the PA signal in the C<sub>2</sub>H<sub>2</sub>–Oil mixed liquid is investigated using the finite element method (FEM). Simulation results reveal that the incident light modulation frequency and the geometry size of the PA cell are two core factors to determine the PA signal. Furthermore, a PA sensor system is constructed to measure the concentration of C<sub>2</sub>H<sub>2</sub> from the C<sub>2</sub>H<sub>2</sub>–Oil mixed solution. The measurement results demonstrate that the intensity of the PA signal in the C<sub>2</sub>H<sub>2</sub>–Oil mixed solution rises mostly linearly with the concentration of C<sub>2</sub>H<sub>2</sub> from 0 to 100 mL/L. The Allan variance results from the continuous tests indicate that the measurement limit of the PA sensor system is about 0.2 mL/L. This work points to a novel method for the measurement of the C<sub>2</sub>H<sub>2</sub> concentration from the C<sub>2</sub>H<sub>2</sub>–Oil mixed solution.
ISSN:2304-6732

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