Methods and apparatus for media level measurement
US7146854B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jul 28, 2005 |
| Grant date | Dec 12, 2006 |
| Priority date | — |
| Expiry date | Jul 28, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/247
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Representative embodiments provide for a media level measurement apparatus, including a sensor to provide an ambient temperature signal, a controller, and a source configured to provide an electrical current. Also included are a thermistor device configured to provide a level signal corresponding to a level of a media in contact with a lengthwise portion of the thermistor device during an application of the pulse of electrical current, and a signal processor configured to provide a media level signal in accordance with the level signal and the ambient temperature signal. A method includes the steps of supporting a lengthwise portion of a thermistor device in contact with a media, applying an electrical pulse to the thermistor device, sensing a level signal from the thermistor device after a predetermined period of time, and providing a media level signal in corresponding to the level signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.