Permittivity spectroscopy apparatus and method
US5363052A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | Feb 16, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/2623
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.