Study on Detection of Acetylene Based on Mid-infrared Laser Photoacoustic Spectroscopy

ZHANG Xiaoxing; HU Junyu; ZHANG Yin; LUO Dan; JIANG Junjie; CHENG Hongtu

doi:10.13296/j.1001-1609.hva.2025.12.025

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Study on Detection of Acetylene Based on Mid-infrared Laser Photoacoustic Spectroscopy

Research & Analysis | 更新时间：2025-12-09

- Study on Detection of Acetylene Based on Mid-infrared Laser Photoacoustic Spectroscopy
- High Voltage Apparatus Vol. 61, Issue 12, Pages: 181-187(2025)
- 作者机构：
  
  湖北工业大学新能源及电网装备安全监测湖北省工程研究中心，武汉 430068
  国网衢州供电公司，浙江衢州 324003
  武汉大学电气与自动化学院，武汉 430072
- 作者简介：
- 基金信息：
  
  Natural Science Foundation Innovation Group of Hubei Province(2021CFA025)
- DOI：10.13296/j.1001-1609.hva.2025.12.025
  CLC：
- Received：16 May 2025，
  
  Revised：2025-07-25，
  
  Published：16 December 2025
- 稿件说明：
移动端阅览
ZHANG Xiaoxing, HU Junyu, ZHANG Yin, et al. Study on Detection of Acetylene Based on Mid-infrared Laser Photoacoustic Spectroscopy[J]. High Voltage Apparatus, 2025, 61(12): 181-187.
DOI：

ZHANG Xiaoxing, HU Junyu, ZHANG Yin, et al. Study on Detection of Acetylene Based on Mid-infrared Laser Photoacoustic Spectroscopy[J]. High Voltage Apparatus, 2025, 61(12): 181-187. DOI： 10.13296/j.1001-1609.hva.2025.12.025.

摘要

中红外激光波段分子吸收系数高，适用于痕量气体的体积分数监测，结合非谐振光声池耗气量小的优点，能实现现场大型变压器油中乙炔气体的高灵敏度光声光谱检测。文中利用HITRAN数据库对乙炔气体进行红外光谱仿真，得到特征吸收峰波段为3300.4 cm

-1

，对光声池进行优化分析，设计内腔半径为3mm的光声池。利用非共振光声池和乙炔中红外激光器搭建光声光谱实验检测系统，进行激光器波长调谐，使波长处于特征吸收峰中心位置。进行激光器频率调制，得到10 Hz的最优频率点，在此激光波长和频率点下进行系统噪声的检测试验，得到了0.10443 mV的系统噪声值，进一步进行乙炔气体的定量检测实验，得到0.9995线性拟合系数，在此基础下完成了信号浓度反演，1～20 μL/L体积分数的乙炔反演结果表明，1 μL/L时检测体积分数与标准体积分数的最大绝对误差为0.09 μL/L，5～20 μL/L时检测体积分数与标准体积分数最大相对误差仅为1.6%，最后计算出检测极限0.520 μL/L，证明文中实验系统对乙炔气体的优良检测能力。

Abstract

The mid-infrared laser band has high molecular absorption coefficient，is suitable for monitoring the concentration of trace gas and can，combined with the advantages of low gas consumption of non-resonant photoacoustic cell，realize the high sensitivity photoacoustic spectrum detection of acetylene gas in oil of large transformer in the field. In this paper，the HITRAN database is used to simulate the infrared spectrum of acetylene gas，and the obtained characteristic

absorption peak band is 3300.4 cm

-1

. Optimization analysis is performed on the photoacoustic cell，and a photoacoustic cell with an inner cavity radius of 3 mm is designed. The experimental detection system of photoacoustic spectrum is set up by using the non-resonant photoacoustic cell and the acetylene mid-infrared laser to tune the wavelength of laser and keep the wavelength in the center of characteristic absorption peak. The optimal frequency point of 10 Hz is obtained by laser frequency modulation. The system noise detection test is performed under the laser wavelength and frequency point and the system noise of 0.10443 mV is obtained. The quantitative detection test of acetylene gas is further performed，and the linear fitting coefficient of 0.9995 is obtained. The signal concentration inversion under this basis is completed.The results of acetylene inversion at the concentration of 1～20 μL/L shows that the maximum absolute error between the detected concentration and the standard concentration is 0.09 μL/L at the concentration of 1 μL/L，and the maximum relative error between the detected concentration and the standard concentration was only 1.6% at the concentration of 5～20 μL/L. Finally，the detection limit is calculat ed to be 0.520 μL/L，proving the good detection ability of the experimental system for acetylene gas.

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references

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