Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1993-09-24
1996-01-02
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324706, 324713, 324601, 324130, 73862628, G01R 2702, G01R 122
Patent
active
054811996
ABSTRACT:
A constant current loop measuring system measures a property including the temperature of a sensor responsive to an external condition being measured. The measuring system includes thermocouple conductors connected to the sensor, sensing first and second induced voltages responsive to the external condition. In addition, the measuring system includes a current generator and reversor generating a constant current, and supplying the constant current to the thermocouple conductors in forward and reverse directions generating first and second measured voltages, and a determining unit receiving the first and second measured voltages from the current generator and reversor, and determining the temperature of the sensor responsive to the first and second measured voltages.
REFERENCES:
patent: 3665756 (1972-05-01), Russell
patent: 4309653 (1982-01-01), Stack et al.
patent: 4448078 (1984-05-01), Bridges
NASA Technical Memorandum 104260, "The Constant Current Loop: A New Paradigm for Resistance Signal Conditioning", by Karl F. Anderson, Oct. 1992.
Anderson Karl F.
Parker Allen R.
Bowser Barry C.
Wieder Kenneth A.
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