Fixed-point cell, thermometer calibration method and fixed-point temperature realizing apparatus
AssigneeNational Institute of Advanced Industrial Science and Technology
InventorsNaohiko Sasajima, Yoshiro Yamada
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Abstract
A thermometer calibration method and fixed-point temperature realizing apparatus uses a fixed-point cell including a crucible of carbon and a fixed-point material enclosed in the crucible. The fixed-point material is a eutectic structure of carbide and carbon. The fixed-point cell is placed in a furnace for increasing and decreasing the environmental temperature of the cell. A thermometer to be calibrated is used to measure temperature variations in the cell and calibrated based on the temperature variations thus measured.
Claims20
A fixed-point cell, comprising:
- a crucible composed of carbon and a fixed-point material enclosed in said crucible, wherein the outer surface of said crucible forms a cavity, and
- wherein the fixed-point material is a eutectic structure of carbide and carbon.
A fixed-point temperature realizing apparatus, comprising:
- a fixed-point cell comprising a crucible composed of carbon and a fixed-point material enclosed in the crucible that is a eutectic structure of carbide and carbon, wherein the outer surface of said crucible forms a cavity,
- a furnace having the cell disposed therein
- a thermometer.
A method for calibrating a thermometer comprising:
- enclosing a fixed-point material that is a eutectic structure of carbide and carbon in a crucible composed of carbon to form a fixed-point cell, wherein the outer surface of said crucible forms a cavity,
- raising and lowering the temperature of the cell, measuring temperature variation in said cavity of the cell with a thermometer, and
- calibrating the thermometer based on measured temperature variation.
A fixed-point cell, comprising:
- a crucible composed of carbon containing a fixed-point material which is a eutectic structure of carbon and carbide,
- wherein the outer surface of said crucible forms a blackbody cavity.
Dependencies are inferred from the claim text.