Abstract
A new circuit is presented for detecting low-level harmonic currents as needed in dielectric relaxation spectroscopy in the low- to medium-frequency range. For a standard operational amplifier-based current-to-voltage converter, a special feedback network is designed such that the output voltage is fairly insensitive to frequency over many decades if a sine generator is coupled to the input via a capacitor with a lossy dielectric. In combination with a gain-phase analyzer or lock-in amplifier this system measures ε*(ω) in the frequency range 10-3 to 107 Hz with high resolution needed for conclusive dielectric relaxation spectroscopy.
Original language | English (US) |
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Pages (from-to) | 3217-3221 |
Number of pages | 5 |
Journal | Review of Scientific Instruments |
Volume | 67 |
Issue number | 9 |
DOIs | |
State | Published - Sep 1996 |
Externally published | Yes |
ASJC Scopus subject areas
- Instrumentation