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Wideband impedance spectrum analyzer for process automation applications
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10.1063/1.2785845
/content/aip/journal/rsi/78/10/10.1063/1.2785845
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/10/10.1063/1.2785845
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Basic working principle of impedance spectrum analyzer electronics.

Image of FIG. 2.
FIG. 2.

(Color online) Schematic diagram of the impedance spectrum analyzer electronics (temperature measurement not shown).

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

Numerical preprocessing performed in the FPGA.

Image of FIG. 5.
FIG. 5.

(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).

Image of FIG. 6.
FIG. 6.

(Color online) Deviation of measurement results for crystal from reference data obtained with HP network analyzer.

Image of FIG. 7.
FIG. 7.

(Color online) Modular software design.

Image of FIG. 8.
FIG. 8.

(Color online) Impedance spectrum analyzer with capacitive senor for dielectric spectroscopy.

Image of FIG. 9.
FIG. 9.

(Color online) Design principle of the developed capacitive sensor (immersion probe).

Image of FIG. 10.
FIG. 10.

(Color online) Noncalibrated spectra for different ethanol-water solutions (real part of voltage ratio).

Image of FIG. 11.
FIG. 11.

(Color online) Capacitive sensor mounted in the flow of the liquid feed.

Image of FIG. 12.
FIG. 12.

Resonant spectra of a langasite resonator at different temperatures.

Image of FIG. 13.
FIG. 13.

Temperature dependence of the resonant frequency measured with the presented sensor electronics compared to a commercial network analyzer (HP 5100A).

Image of FIG. 14.
FIG. 14.

Frequency shift of a coated langasite resonator during variation of the oxygen partial pressure.

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/content/aip/journal/rsi/78/10/10.1063/1.2785845
2007-10-01
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Wideband impedance spectrum analyzer for process automation applications
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/10/10.1063/1.2785845
10.1063/1.2785845
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