Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1997-04-16
1999-10-26
Patidar, Jay
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324117R, G01R 33032, G01R 1900, G02B 642
Patent
active
059734922
ABSTRACT:
An improved magneto optical current transducer for measuring electrical current is taught that significantly reduces birefringence resulting from thermal transients and construction-induced stresses. The transducer includes a housing made of a material that readily transfers heat throughout itself. Inside the housing and surrounding the magneto optical material is a buffer made of a material that does not readily tranfer heat from the housing to the magneto optical material, but rather slows its transference to that material material. The buffer material has a thermal expansion coefficient that is preferably very close to that of the magneto optical material, so that when the magneto optical material responds to changes in its temperature by expanding or contracting, the buffer expands with it at very nearly the same rate to avoid stresses. Finally, either spring-loaded elements or resilient material-backed elements are positioned between the housing and the buffer to evenly resist translational movement of the magento optical material but to allow expansion of it so that stresses due to thermal expansion are minimized.
REFERENCES:
patent: 3906343 (1975-09-01), Feldtkeller
patent: 4539521 (1985-09-01), Matsumoto
patent: 5488291 (1996-01-01), Koide
Mann Michael A
Patidar Jay
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