Capacitive fuel composition sensor with slow oscillator and high speed switch
US5231358A · kind A · utility
32Cited by
15References
8Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 18, 1991 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Dec 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/221
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fuel composition sensor provides to a voltage divider comprising sensor and reference capacitors a voltage which oscillates between two voltages at a comparatively low frequency, such as 6 KHz, for lower power dissipation, but which switches fast to produce periodic fast voltage changes across the voltage divider to produce voltage spikes at the junction of the capacitors indicative of the capacitance ratio and thus of fuel composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.