Physics – Instrumentation and Detectors
Scientific paper
2007-04-23
Meas. Sci. Technol., 19, 045702-6(2008)
Physics
Instrumentation and Detectors
11 pages, 6 figures. To be submitted to Rev. Sci. Instrm
Scientific paper
10.1088/0957-0233/19/4/045702
This letter presents principles and applications of a virtual multi-channel lock-in amplifier that is a simple but effective method to recover small ac signal from noise with high presison. The fundamentals of this method are based on calculation of cross-correlation function. Via this method, we successfully built up a magnetoelectric measurement system which can perform precise and versatile measurements without any analog lock-in amplifier. Using the virtual multi-channel lock-in amplifier, the output of the magnetoelectric measurement system is extensively rich in magnetoelectric coupling behaviors, including coupling strength and phase lag, under various dc bias magnetic field and ac magnetic field.
Lu Jun
Pan De-An
Qiao Lijie
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