Open AccessApplication of Lock-in Amplifier Technique in AC FSM based on AD630
Author(s) -
Rujiao Duan,
Xiangji Meng,
Yong Yang,
Ming Sun,
Jinzhong Chen,
Haitao Wang
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/631/3/032050
Subject(s) - lock in amplifier , amplifier , pipeline (software) , computer science , electronic engineering , signature (topology) , signal (programming language) , electrical engineering , engineering , cmos , mathematics , geometry , programming language
Field Signature Method (FSM) is one of non-intrusive technique for pipeline internal corrosion monitoring, but the commercial FSM systems nowadays are all using DC input which have many shortcomings. In this paper, AC FSM based on AC input has been developed, DC FSM can be replaced by AC FSM with low-frequency. To extract weak signals, the lock-in amplifier based on AD630 has been designed and manufactured, the functions and designed circuits of each part have been proposed. Experimental results show that, the application of lock-in amplifier technique in AC FSM based on AD630 can measure the weak signal from the noise interference effectively, ensuring the accuracy and security at the same time.