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US 8,912,852 B2Granted
Quartz pressure and temperature transducer assembly with dynamic correction
AssigneeSensor Developments AS
InventorOivind Godager
Life of this patent
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Abstract
A quartz transducer having four or more crystal-controlled oscillators intended for measurement of applied pressure and temperature. All four oscillators are controlled by crystal quartz resonators operating in the thickness-shear mode. Two crystals measure the pressure and temperature respectively. A third crystal is a reference, and the fourth crystal may be another reference crystal or a second temperature crystal. The output of the latter is either phase leading or phase lagging the thermal response of the main temperature sensor.
Claims40
A transducer assembly, comprising:
- first, second, third, and fourth crystal controlled oscillators;
- first, second, third, and fourth thickness shear mode crystal quartz resonators, wherein the first, second, third, and fourth oscillators are respectively controlled by the first, second, third, and fourth crystal quartz resonators;
- wherein the first crystal quartz resonator and the second crystal quartz resonator respectively comprise a pressure resonator and a reference resonator that are configured together as a pressure sensor providing a frequency output;
- wherein the third crystal quartz resonator comprises a first temperature resonator that is configured as a temperature sensor providing a frequency output;
- wherein the fourth crystal quartz resonator comprises a second temperature sensor resonator and is part of the same holder as the reference resonator and the temperature resonator or is part of a different holder;
- and
- wherein a frequency output of the fourth oscillator is mixed with a frequency output of the third oscillator to derive a dynamic thermal output.
4 more elements
A transducer assembly, comprising:
- first, second, third, and fourth crystal controlled oscillators;
- first, second, third, and fourth thickness shear mode crystal quartz resonators, wherein the first, second, third, and fourth oscillators are respectively controlled by the first, second, third, and fourth crystal quartz resonators;
- wherein the first crystal quartz resonator and the second crystal quartz resonator respectively comprise a pressure resonator and a reference resonator that are configured together as a pressure sensor providing a frequency output;
- wherein the third crystal quartz resonator comprises a temperature resonator that is configured as a temperature sensor providing a frequency output;
- wherein the fourth crystal quartz resonator comprises a temperature sensor;
- wherein the fourth crystal quartz resonator comprises a second reference resonator, the second reference resonator and the temperature resonator being configured together as a temperature sensor providing frequency output;
- wherein each of the reference resonator and the second reference resonator is an individual unit and is mounted in a different holder, and providing their provides its own characteristic thermal time constant.
4 more elements
A transducer assembly, comprising:
- first, second, third, and fourth crystal controlled oscillators;
- first, second, third, and fourth thickness shear mode crystal quartz resonators, wherein the first, second, third, and fourth oscillators are respectively controlled by the first, second, third, and fourth crystal quartz resonators;
- wherein the first crystal quartz resonator and the second crystal quartz resonator respectively comprise a pressure resonator and a reference resonator that are configured together as a pressure sensor providing a frequency output;
- wherein the third crystal quartz resonator comprises a temperature resonator that is configured as a temperature sensor providing a frequency output;
- wherein the fourth crystal quartz resonator comprises a temperature sensor;
- wherein the fourth crystal quartz resonator comprises a second reference resonator, the second reference resonator and the temperature resonator being configured together as a temperature sensor providing frequency output;
- wherein each of the reference resonator and the second reference resonator is an individual unit and is mounted in the same holder, and provides its own characteristic thermal time constant.
4 more elements
A transducer assembly, comprising:
- first, second, third, and fourth crystal controlled oscillators;
- first, second, third, and fourth thickness shear mode crystal quartz resonators, wherein the first, second, third, and fourth oscillators are respectively controlled by the first, second, third, and fourth crystal quartz resonators;
- wherein the first crystal quartz resonator and the second crystal quartz resonator respectively comprise a pressure resonator and a reference resonator that are configured together as a pressure sensor providing a frequency output;
- wherein the third crystal quartz resonator comprises a temperature resonator that is configured as a temperature sensor providing a frequency output;
- wherein the fourth crystal quartz resonator comprises a temperature sensor;
- wherein the fourth crystal quartz resonator comprises a second reference resonator, the second reference resonator and the temperature resonator being configured together as a temperature sensor providing frequency output;
- wherein the mixing combining the frequency outputs of the second oscillator and the fourth oscillator produces an output signal having a response that is dynamic and is related to the temperature difference between the reference resonator and the second reference resonator.
4 more elements
Dependencies are inferred from the claim text.