Method and arrangement for acoustically determining a fluid temperature
AssigneeMaquet Critical Care AB
InventorsLars Wallen, Goran Skog
Life of this patent
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Abstract
In a method and an arrangement for acoustic determination of an instantaneous fluid temperature, acoustic velocity V in a fluid is monitored and an output signal related to the acoustic velocity is generated. A conventional temperature sensor senses a fluid temperature TS and generates an output signal related thereto. A signal processor receives the signals from the sensor and the acoustic velocity monitor determines the instantaneous fluid temperature TA based on a relationship: TA=kV2; where k is a constant dependent on the composition of the fluid that is calculated within the signal processor based on the relationship: k=TS/V2
Claims8
An arrangement for acoustically determining an instantaneous temperature of a fluid, comprising:
- an acoustic velocity monitor which emits acoustic energy into fluid in a fluid zone having an instantaneous temperature and monitors an acoustic velocity of said fluid in said fluid zone and which generates an acoustic velocity output signal related thereto;
- a non-acoustic temperature sensor disposed in said fluid zone which senses a fluid temperature of said fluid in said fluid zone into which the acoustic energy is emitted and which generates a fluid temperature output signal related thereto;
- and
- a signal processor connected to said acoustic velocity monitor and to said non-acoustic temperature sensor which processes said acoustic velocity output signal and said fluid temperature output signal in combination to determine therefrom said instantaneous temperature of said fluid in said fluid zone into which the acoustic energy is emitted.
A method for acoustically determining an instantaneous temperature of a fluid, comprising the steps of:
- emitting acoustic energy into fluid, having an instantaneous temperature in a fluid zone and acoustically monitoring a velocity of said fluid in said fluid zone to obtain an acoustic velocity value;
- non-acostically sensing a temperature of said fluid in said fluid zone to obtain a sensed temperature value;
- and
- determining said instantaneous temperature of said fluid in said fluid zone dependent on said acoustic velocity value and said sensed temperature value.
Dependencies are inferred from the claim text.