A digital dual-phase lock-in amplifier for MFL and ECT NDT applications

Mohd Aufa Hadi, Putera Zaini and Mohd Mawardi, Saari and Nurul A’in, Nadzri and Zulkifly, Aziz (2021) A digital dual-phase lock-in amplifier for MFL and ECT NDT applications. In: Proceedings of the 6th International Conference on Electrical, Control and Computer Engineering , 23 August 2021 , Kuantan, Malaysia. pp. 989-997., 842. ISBN 978-981-16-8689-4

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In the electromagnetic methods of NDT, the separation of complex magnetic signals, i.e., Magnetic Flux Leakage (MFL) and Eddy Current (EC), is hard to be achieved. Therefore, the utilization of phase-sensitive detection technique of lock-in amplifier can be applied to overcome this problem. Furthermore, due to several disadvantageous, the digital lock-in amplifier is preferable compared to the analog lock-in amplifier. Also, a dual-phase lock in amplifier excels in term of overcoming the error caused by the phase shift circuit compared to the single-phase lock-in amplifier. In this study, a digital dual-phase lock-in amplifier is developed via NI-LabVIEW. A data acquisition card (NI-DAQ 6212, National Instruments, USA) is used for the data acquisition purpose. With the 16-bit ADC converter of the NI-DAQ 6212, the input range of the DAQ was set from −5 V to 5 V. Then, the frequency, phase and noise characteristics of the developed lock-in amplifier are studied. From the results, in terms the characteristics of frequency and phase, it can be said that the developed lock-in amplifier does fulfill its job in extracting the correct amplitude and phase. Meanwhile, in term of noise characteristics, the performance of the developed lock-in amplifier is still reliable with some margin of errors.

Item Type: Conference or Workshop Item (Lecture)
Additional Information: Part of the Lecture Notes in Electrical Engineering book series
Uncontrolled Keywords: Lock-in amplifier; Dual-phase; NDT; MFL; ECT
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Faculty/Division: Faculty of Electrical & Electronic Engineering
Institute of Postgraduate Studies
Depositing User: Pn. Hazlinda Abd Rahman
Date Deposited: 15 Apr 2022 04:13
Last Modified: 15 Apr 2022 04:13
URI: http://umpir.ump.edu.my/id/eprint/33554
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