Patent ID: 9581568
Date: 2017-02-28
CPC Classifications: G01K,G01L,G01N

Claim:
1. A system for measuring pressure and temperature based on ultrasound, the system comprising: a sensor comprising two separate measuring channels being in the form of a space or gap, and an ultrasonic transducer, the ultrasonic transducer being arranged in recesses to transmit and receive ultrasound to and from the two separate measuring channels, said measuring channels containing a medium in liquid state whose pressure and temperature properties are known, wherein a first measuring channel of the two separate measuring channels is separated from a surrounding pressure of the measuring channels and wherein the first measuring channel is filled with a flexible medium and has an internal pressure compensator by a bellows for eliminating pressure accumulation due to temperature expansion, and wherein temperature is measured due to change in the properties of the medium for ultrasound, said change being measured by transit time or resonance frequency, a second measuring channel of the two separate measuring channels comprising a flexible bellows being open to a surrounding medium and wherein the flexible bellows in the second measuring channel transfers ambient pressure into a change in the properties of the second measuring channel for transit time or resonance frequency in the medium, and wherein temperature measurement in the first measuring channel is used to correct temperature effect on pressure measurement in the second measuring channel.