Thermal measuring and testing – Temperature measurement – Combined with diverse art device
Patent
1986-01-27
1989-06-06
Yasich, Daniel M.
Thermal measuring and testing
Temperature measurement
Combined with diverse art device
73705, 128736, 250231P, 250577, 356375, 374143, G01J 0500, G01N 0700, G01N 2500
Patent
active
048377775
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field.
This invention relates to transducers for measuring pressure or temperature.
2. Background Art.
Pressure transducers are well known instruments with a wide variety of applications. They usually comprise a chamber, often cylindrical, with one side occupied by an elastic diaphragm. The deformation of the diaphragm caused by the pressure under measurement if sensed in various ways depending on the principle of the transducer. However transducers whose function is based on the deformation of a diaphragm present several problems. This is because the diaphragm material and thickness are important factors determining the transducer performance and require meticulus care and also the secure mounting of the diaphragm at the appropriate site is an elaborate task given the small dimensions of these instruments.
Temperature transducers are usually based on the thermoelectric phenomenon (thermocouples), or the phenomenon of thermally affected resistance, or the thermal expansion phenomenon whereby the change in dimension of a medium is monitored. This medium can be either liquid or solid. In the case of solid mediums they are sometimes of the form of a diaphragm whose shape depends on the temperature. In this later case identical problems to the ones mentioned above are encountered especially for miniaturised diaphragm-type temperature transducers.
DISCLOSURE OF INVENTION
According to the present invention there are provided transducers of simple construction capable of measuring pressure or temperature. They comprise, according to one embodiment of the present invention, a quantity of compressible deformable material, a quantity of gas for example, or combination of materials forming a compressible deformable structure; and a quantity of essentially incompressible deformable material such as liquid or gel, for example. The compressible deformable material or the combination of materials forming a compressible deformable structure will be referred to throughout the rest of the present description, up to and including the part "Industrial Applicability", as "gas", and the essentially incompressible deformable material will be referred to throughout the rest of the present description up to and including the part "Industrial Applicability", as "liquid".
The gas is either concentrated in one volume or dispersed in a number of volumes so as to form one or more interface(s) with the liquid. Pressure and/or temperature variations of the liquid alter the volume and/or the geometry of the gas. Near the gas and the liquid are proper means for detection to sense the changes in the gas volume and/or the geometry of the gas interface(s) with the liquid. These changes are induced by the physical quantity under measurement (pressure or temperature). When pressure is measured the liquid communicates with the pressure source and its temperature should be kept constant or be continuously monitored. When temperature is measured the liquid communicates with a source of constant or continuously monitored pressure. The only deformable element of the transducer is the gas, every other part of it being substantially rigid.
Electrolytic, chemical or physical methods can be used to introduce or generate the gas. By way of example reference is made to some appropriate methods. As an example of an electrolytic method, two electrodes are placed at appropriate positions in the liquid and an electric current passes through the liquid, which in this case is electrically conductive. By proper selection of the chemical composition of the electrodes and the electrically conductive liquid, gaseous substance is formed on the surface of the electrodes, the gaseous substance being in this case the compressible deformable material or combination of materials forming a compressible deformable structure.
As an example of a chemical method, a properly selected chemical substance is placed at appropriate place(s) either on the surface of the appropriate means for detection referred to above or on the surface of a body or bodi
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Jones Norman B.
Papageorgiou George
Gierczak Eugene J. A.
Yasich Daniel M.
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