Development of an Impedance Meter Based on a Digital Lock-In Amplifier with 4-Kelvin-Probe Electrodes
2021 ◽
Vol 18
(4)
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pp. 1171-1176
Keyword(s):
Lock In
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In this paper, it is described a new design of a digital Lock-In amplifier applied to 4-Kelvin- probe electrodes for the measurement of complex electrical variables. The proposed design is based on the operation of a Phase Sensitive Detection (PSD) circuit and on signal acquisition by the Nyquist principle. The hardware basically consists of a programmable embedded system and an analog interfacing circuit. The microcontroller within the circuit was programmed using standard C language for portability and performs the acquisition of the resulting signal along with mathematical operations. Experimental tests on the prototype have shown that it performs as theoretically predicted.
1989 ◽
Vol 60
(7)
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pp. 2257-2259
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Keyword(s):
2007 ◽
Vol 18
(5)
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pp. N27-N31
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Keyword(s):
Keyword(s):