基于一种混频幅值算法的油气管道探测仪及应用  

An oil and gas pipeline detector based on the frequency mixing amplitude algorithm and its application

作　　者：朱青松[1,2] 林福严[1] 张瑜峰[2] 李宏昭[2] 徐美德[2] 郑发跃[2] ZHU Qingsong LIN Fuyan ZHANG Yufeng LI Hongzhao XU Meide ZHENG Fayue(School of Mechanical Electronic and Information Engineering, China University of Mining and Technology Automation Engineering Institute, Beijing Polytechnic)

机构地区：[1]中国矿业大学机电与信息工程学院 [2]北京电子科技职业学院自动化工程学院

出　　处：《油气储运》2017年第4期381-386,共6页Oil & Gas Storage and Transportation

基　　金：北京市教委科研基地-机电产品创新平台-智能地下管线探测器研制;PXM2014_014306_000065

摘　　要：针对目前地下油气管道探测仪由于高采样率、高精度而造成功耗大的问题,引入一种混频幅值算法,使得探测仪接收机能够在远低于2倍发射频率的情况下完成采样并进行相应的地下油气管道埋深的计算。根据地下管道探测仪工作原理,被测信号为等幅正弦信号,将其与方波信号通过乘法器混合得到混频信号,再通过低通滤波回路得到频率更低的信号,其频率为方波信号与正弦波信号的频率差值。接收机采集该低频信号,并计算被测信号的强度幅值即可确定油气管道的埋深。经试验证明,当管道埋深在2 m以内时,用该方法探测油气管道深度的相对误差在±2%内,且接收机测得的感应电压幅值稳定可靠,能够满足地下油气管道探测的要求,同时还降低了功耗和成本,大幅提高了地下油气管道探测仪的性价比。At present, an underground oil and gas pipeline detector consumes much power due to its high sampling rate and high precision. In order to solve this problem, the frequency mixing amplitude algorithm was put forward, so that the receivers of the detectors could perform sampling and calculate the buried depth of oil and gas pipelines even though the sampling frequency is far less than two times of the transmission frequency. It is indicated from the working principles of underground pipeline detectors that the measured signals are constant-amplitude sine signals. Frequency mixing signals are obtained when the measured signals and the square wave signals are mixed by using the multiplier. Then, the lower frequency signals are obtained by means of the low-pass filter circuit and the frequency is the frequency difference between the square wave signal and the sine signal. The burial depth of oil and gas pipelines can be confirmed when the receivers collect the low-frequency signals and calculate their intensity amplitude. It is shown from the experiments that the requirements on underground oil and gas pipeline detections are satisfied with the relative depth error less than ~2% and the induction voltage amplitude measured by the receivers is stable and reliable when the pipelines are buried above 2 m. And fiartbermore, the power consumption and cost of underground oil and gas pipeline detector are reduced significantly, and its performance-price ratio is improved greatly.

关 键 词：管道探测 电磁感应 采样 混频 幅值算法 

分 类 号：TU990.3[建筑科学—市政工程]