LONG Feixu,HE Yanlin,ZHANG Longyao,et al.Research and Design of Acoustic Positioning System for Underground Non-metallic Gas Pipelines[J].Journal of Chengdu University of Information Technology,2026,41(01):71-76.[doi:10.16836/j.cnki.jcuit.2026.01.010]
地下非金属燃气管道声波定位系统研究与设计
- Title:
- Research and Design of Acoustic Positioning System for Underground Non-metallic Gas Pipelines
- 文章编号:
- 2096-1618(2026)01-0071-06
- Keywords:
- non-metallic pipe; acoustic wave detection; signal power analysis; FPGA signal processing; pipeline positioning
- 分类号:
- TN492
- 文献标志码:
- A
- 摘要:
- 传统的地下管线探测技术主要针对金属管道,而对非金属燃气管道的探测仍存在较大挑战。提出一种基于声波信号的地下非金属燃气管线定位方法,通过主动激励与信号检测相结合的方式实现管道的精准探测[1]。该方法采用特定频率的声波信号注入管道,声波沿管道传播并部分耦合至地面。地面端采用高灵敏度拾音器作为接收装置,采集泄漏至地表的声波信号,经ADC采样后送入FPGA进行数字信号处理,计算信号幅值及功率变化。当探头接近管道正上方时,由于声波传播路径缩短,接收信号功率增强; 当探头偏离管道时,信号功率逐渐衰减。通过分析信号功率的空间分布特征,可准确推断地下管道的水平位置及走向。此外,系统采用音频DAC芯片将数字信号转换为可听声波,工作人员可通过耳机实时监听声波变化,辅助判断管道位置。实验表明,系统在1.5 m埋深条件下的水平定位误差≤10 cm,为城市地下管网安全运维提供了有效技术手段。
- Abstract:
- Traditional underground pipeline detection technologies mainly target metal pipelines, while there are still significant challenges in the detection of non-metallic gas pipelines. This paper proposes a location method for underground non-metallic gas pipelines based on acoustic wave signals, achieving precise detection of pipelines through the combination of active excitation and signal detection[1]. This method injects acoustic wave signals of specific frequencies into the pipeline. The acoustic waves propagate along the pipeline and partially couple to the ground. At the ground end, a highly sensitive pickup is adopted as the receiving device to collect the acoustic wave signals leaked to the surface. After being sampled by the ADC, they are sent to the FPGA for digital signal processing to calculate the signal amplitude and power variation. When the probe approaches directly above the pipe, due to the shortened propagation path of the sound wave, the received signal power is significantly enhanced. When the probe deviates from the pipe, the signal power gradually decays. By analyzing the spatial distribution characteristics of signal power, the horizontal position and direction of underground pipelines can be accurately inferred. In addition, the system uses an audio DAC chip to convert digital signals into audible sound waves. Staff can monitor the changes of the sound waves in real time through headphones to assist in determining the position of the pipeline. Experiments show that the horizontal positioning error of the system under the burial depth condition of 1.5 m is ≤10 cm, providing an effective technical means for the safe operation and maintenance of urban underground pipe networks.
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备注/Memo
收稿日期:2025-05-06
通信作者:王海江.E-mail:whj@cuit.edu.cn