Temperature-measuring microwave radiometer apparatus
US5149198A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 1991 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | May 2, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K11/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed are the following three improvements to apparatus employing a microwave radiometer to measure the temperature of a specimen: By situating a low-loss, high-temperature dielectric microwave antenna, which may be composed of low-loss alumina ceramic, within a high-loss-high-temperature antenna sheath, which may be a ceramic composed of an alumina-graphite mixture, a microwave radiometer may be employed to continuously measure the temperature of a material at high temperature, such as molten steel. A Dicke switch replacement for a microwave radiometer comprises a first hybrid ring in which (1) a first combination of first and second input signals thereto derived at a first output port thereof is amplified and forwarded through a switchable phase shifter to a first input port of a second hybrid ring, and (2) a second combination of the first and second input signals thereto derived at a second output port thereof is amplified and forwarded directly to a second input port of the second hybrid ring, resulting in one of the amplified first and second input signals being derived at a first output port of the second hybrid ring and the other of the amplified first and second input …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.