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Impedance measuring circuits play a crucial role in an electrical impedance tomography system, in which capacitance and resistance need to be measured accurately at a high speed. Several impedance measuring circuits based on phase-sensitive demodulation (PSD) have been designed, tested, and presented in this paper. The measurement error is analyzed, and the mismatch of the measured capacitance and...
Multi-frequency eddy current test (MFECT) is an important NDT technology, and it can be applied to realize multi-parameter detection and interference elimination effectively. Aiming at the problem that conventional single-frequency eddy current test can only identify defects but can't classify defects effectively, a new MFECT technology which adopts LFM signal exciting and spectrum analysis method...
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