Capacitive melt pressure measurement with center-mounted electrode post
US5492016A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1993 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Dec 14, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L19/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A melt pressure measurement probe for insertion through wall of melt-containing vessel has a pressure-deflectable end portion for contact with pressurized melt. Pressure-resistant securing means fixes the end surface in a non-flow obstruction relationship. A seal surface on the probe prevents exposure of the melt to the securing means. Pressure detection means internal of the probe, responsive to deflection of the probe end surface to detect melt pressure, comprises a temperature-compensated capacitive sensor, one capacitor plate defined by the end portion and an opposite capacitor plate in the probe with a capacitive gap in-between. Electronic circuitry remote from the melt-exposed end, including circuitry within the probe to generate a signal proportional to the capacitance, compensates for change of temperature of the capacitor to generate an output signal proportional to melt pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.