Method and apparatus for measuring temperature using thermocouple
US5038303A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Dec 28, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K7/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus accurately measures temperature even if a temperature difference exists between cold junctions of the main thermocouple. An auxiliary thermocouple is connected to one leg of the main thermocouple to provide cold junction compensation. Extension leads are connected to both cold junctions to take thermo emf from the thermocouple. The leads are made from a material having a thermoelectromotive characteristic in agreement with the thermoelectromotive characteristic of the other leg at low temperatures at which the cold junction compensation is provided. A converter converts the thermo emf of the composite thermocouple into temperature. The converter can separately set interpolations for converting the thermo emf of the auxiliary thermocouple into thermo emf of the main thermocouple and for coverting the sum of the converted thermo emf and the thermo emf of the main thermocouple into temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.