Dielectric-constant measuring apparatus
US3965416A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1974 |
| Grant date | Jun 22, 1976 |
| Priority date | — |
| Expiry date | May 28, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N22/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Accurate and stable measurement of the dielectric constant of a substance or a mixture of substances is achieved by the use of an oscillatory system incorporating a shorted transmission line as a delay means, to cycle the system. The substance for which the dielectric constant is to be determined is introduced between or about the elements of the transmission line so as to vary the propagation rate or delay of signals through the transmission line. Accordingly, the frequency of oscillation for the system is indicative of the dielectric constant of the substance. Several specific forms of transmission lines, embodied as sensors are disclosed along with different forms of oscillator drivers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.