Back to results
US 4,064,550 AGranted
High fidelity pressure transducer
AssigneeHewlett-Packard Company
InventorsJ. Fleming Dias, Henry E. Karrer, Alexander Tykulsky
Life of this patent
Estimating the term…
Abstract
The capacitive fluid pressure transducers described herein comprise quartz bodies and diaphragms having suitable electrodes deposited thereon to form both sensing and reference capacitors in appropriate configurations for high fidelity measurement of relative blood pressure, said transducers being substantially unaffected by temperature and other environment factors.
Claims5
A fluid pressure transducer comprising:
- a quartz body having a body electrode of electrically conductive material;
- and
- a deflectable quartz diaphragm peripherially coupled to the body and having a ring shaped sensing electrode of electrically conductive material disposed on and substantially limited to the inflection circle of the diaphragm for capacitive coupling with the body electrode to form a sensing capacitor;
- said diaphragm being deflected by fluid pressure fluctuations to change the capacitance of the sensing capacitor in substantially linear proportion to such fluctuations.
1 more element
Dependencies are inferred from the claim text.