油气管道内腐蚀外监测系统硬件电路设计

发布时间：2018-05-02 14:15

  本文选题：FSM + 锁相放大　； 参考：《中国特种设备安全》2016年11期

【摘要】：目前,对于管道内部腐蚀的在线监测,最先进的商用系统是基于FSM(Field Signature Method)开发的,可以实现不需要在管道打洞,非破坏式的监测。但是现有设备通常采用直流电流源激励,存在信噪比低,易引起电火花,电缆较粗等诸多缺点。针对上述问题,本文采用交流激励电流源和锁相放大技术进行设计开发,对采集的微弱电压信号先进行前置放大,在达到足够的电平等级后,再推动锁相放大器进行锁相放大,去除所有不同频率的干扰。实验表明,本文所述的设计在信噪比、精度和稳定性上满足项目要求,可以很好地避免现有的基于直流激励技术的FSM设备所存在的问题。
[Abstract]:At present, the most advanced commercial system is based on FSM(Field Signature method for on-line monitoring of pipeline internal corrosion. However, the existing equipment is usually excited by DC current source, which has many disadvantages, such as low signal-to-noise ratio (SNR), easy to cause electric spark and coarser cable, etc. In order to solve the above problems, this paper uses AC current source and phase-locked amplification technology to design and develop. The collected weak voltage signal is preamplified first, and then the phase-locked amplifier is promoted to amplify the phase locked amplifier after reaching enough level level. Remove all interference at different frequencies. The experimental results show that the proposed design meets the project requirements in signal-to-noise ratio (SNR), accuracy and stability, and can avoid the problems existing in the existing FSM equipment based on DC excitation technology.
【作者单位】： 中国特种设备检测研究院;中国石油天然气股份有限公司塔里木油田分公司;
【分类号】：TE988.2
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本文编号：1834251