Patent · US Active

Constant power dissipation in capacitance pressure transducers

US7451654B2 · kind B2 · utility

3Cited by
1References
20Claims
0Family size

Assignee

Inventors

Key dates

Filing dateAug 9, 2007
Grant dateNov 18, 2008
Priority date—
Expiry dateAug 9, 2027

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01L9/12
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A system and method are described for maintaining power dissipation substantially constant across the sensor interface board of a capacitance pressure transducer. A shorted diaphragm level detector detects a shorting of the diaphragm onto one or more reference electrodes. A power dissipating resistor is placed near the oscillator that drives the capacitance detecting circuit in the capacitance pressure transducer. The resistor is switched across a power supply when the shorting is detected, causing current to flow through the resistor so that power can be added in an amount sufficient to maintain power dissipation by the oscillator substantially constant when the diaphragm shorts.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.