Permittivity spectroscopy apparatus and method

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

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324615, 324633, 324639, G01R 2726

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active

053630521

ABSTRACT:
An apparatus and method for measuring the permittivity of a polar solution specimen to enable a determination of the concentration of polar constituents in the specimen. The apparatus (10) employs a band pass filter including containment means (18) formed to contain the polar solution (26) therein and electrically dispose the polar solution (26) as a dielectric element in the band pass filter; conducting means (12); a source of electrical current (56) connected to said band pass filter; frequency variation means (52) electrically connected to the electric voltage source (56) to enable variation of the frequency at which current is applied to the band pass filter; and voltage sensing means (52) electrically connected to sense the peak voltage passed by the band pass filter. The method includes providing a band pass filter having a conducting microstrip (12), disposing a specimen solution (26) between the conducting microstrip (12) and the ground plane 18); applying an electric current to the band pass filter; varying the frequency of the current; and determining the center frequency of the band pass filter as the current is varied.

REFERENCES:
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patent: 5132623 (1992-07-01), De et al.
M. A. Stuchly and S. S. Stuchly, Coaxial Line Reflection Methods for Measuring Dielectric Properties of Biological Substances at Radio and Microwave Frequencies--A Review, IEEE Trans, Instru. Meas., vol. IM-19, No. 3, pp. 176-183, Sep. 1980.
K. C. Gupta, R. Garg, and I. J. Bahl, Microstrip Lines and Slotlines, RTech, pp. 2-4, (1979).
CRC Handbook of Chemistry and Physics, 67th ed., E50-56, CRC Press, 1986.
B. K. P. Scaife, Principle of Dielectrics--Monograms on the Physics and Chemistry of Material, p. 80, Clarendon Press (1989).

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