Basic working principle of impedance spectrum analyzer electronics.
(Color online) Schematic diagram of the impedance spectrum analyzer electronics (temperature measurement not shown).
(Color online) Sensor modules for connecting different sensor types to the ISA sensor interface: (a) transmission based interface for QCR with as quartz and (b) voltage divider based interface for dielectric measurement with as sensor impedance and as reference impedance.
Numerical preprocessing performed in the FPGA.
(Color online) Standard deviation of measured noise at different quartz impedances for the developed impedance spectrum analyzer (ISA, dark line) in comparison to a commercial device (HP 4395A, bright line).
(Color online) Deviation of measurement results for crystal from reference data obtained with HP network analyzer.
(Color online) Modular software design.
(Color online) Impedance spectrum analyzer with capacitive senor for dielectric spectroscopy.
(Color online) Design principle of the developed capacitive sensor (immersion probe).
(Color online) Noncalibrated spectra for different ethanol-water solutions (real part of voltage ratio).
(Color online) Capacitive sensor mounted in the flow of the liquid feed.
Resonant spectra of a langasite resonator at different temperatures.
Temperature dependence of the resonant frequency measured with the presented sensor electronics compared to a commercial network analyzer (HP 5100A).
Frequency shift of a coated langasite resonator during variation of the oxygen partial pressure.
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