System for measuring pressure and temperature

US9581568B2 · kind B2 · utility

Assignee

• Techni Holding AS · NO

Inventors

• Harald Borgen · Horten, NO
• David Petersen · Åsgårdstrand, NO
• Petter F. Schmedling · Moss, NO
• Marius Bornstein · Oslo, NO
• Trond Sjulstad · Svarstad, NO
• Morten Roll Karlsen · Borre, NO
• Andreas Bjerknes Taranrød · Sogndal, NO
• Jan Martin Bendiksen · Drammen, NO
• Tor Helge Brandsæter · Hvittingfoss, NO

Key dates

• Filing date: Feb 16, 2012
• Grant date: Feb 28, 2017
• Expiry date: Dec 26, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/02881
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present invention relates to system for measuring pressure and temperature based on change in the characteristic properties of a medium for ultrasound under the effect of pressure and temperature. The invention is based on two waveguides where geometry is adapted to the medium's characteristic properties for ultrasound such that only planar pressure waves are generated in the waveguides. The first of the waveguides is arranged for measuring temperature due to thermal expansion of the medium, where the medium is pressure-compensated by means of an internal compensator to prevent thermal pressure accumulation, and where measuring temperature is based on the medium's specific known characteristic data for ultrasound under the effect of temperature under constant pressure. The second waveguide is arranged for measuring pressure, based on waveguide and the medium's known characteristic properties for thermal expansion and pressure, and where the thermal effect is corrected analytically based on measurement of temperature in the first channel. The physical principle of the invention is based on the properties of a medium (oil) where the stability for high temperature and pressure is …