本文選題：FSM + 鎖相放大　； 參考：《中國(guó)特種設(shè)備安全》2016年11期

【摘要】：目前,對(duì)于管道內(nèi)部腐蝕的在線監(jiān)測(cè),最先進(jìn)的商用系統(tǒng)是基于FSM(Field Signature Method)開(kāi)發(fā)的,可以實(shí)現(xiàn)不需要在管道打洞,非破壞式的監(jiān)測(cè)。但是現(xiàn)有設(shè)備通常采用直流電流源激勵(lì),存在信噪比低,易引起電火花,電纜較粗等諸多缺點(diǎn)。針對(duì)上述問(wèn)題,本文采用交流激勵(lì)電流源和鎖相放大技術(shù)進(jìn)行設(shè)計(jì)開(kāi)發(fā),對(duì)采集的微弱電壓信號(hào)先進(jìn)行前置放大,在達(dá)到足夠的電平等級(jí)后,再推動(dòng)鎖相放大器進(jìn)行鎖相放大,去除所有不同頻率的干擾。實(shí)驗(yàn)表明,本文所述的設(shè)計(jì)在信噪比、精度和穩(wěn)定性上滿足項(xiàng)目要求,可以很好地避免現(xiàn)有的基于直流激勵(lì)技術(shù)的FSM設(shè)備所存在的問(wèn)題。
[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.
【作者單位】： 中國(guó)特種設(shè)備檢測(cè)研究院;中國(guó)石油天然氣股份有限公司塔里木油田分公司;
【分類號(hào)】：TE988.2
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本文編號(hào)：1834251