Fiber optic

Details Fiber optic Fiber optic

1989-03-23

1989-09-19

Moskowitz, Nelson

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324263, 350 9614, 330 43, G01R 0000

Patent

active

048684953

ABSTRACT:
A single mode optical fiber is used to detect electrical currents or magnetic fields from a source to a high degree of accuracy. Phase modulation of an optical beam is used to determine the changes of physical properties of a magnetostrictive material which jackets the fiber or around which the fiber is wound. An electromagnetic field, such as that emanating from a high intensity field wire, is measured by the device which acts as a current transformer and meters peak-to-peak electric currents of approximately 10,000 amperes or more with accuracy exceeding 0.1%. The invention structure of the device provides advantages such as operation safety, EMI immune leads, low cost, light weight, and dielectric construction among others.

REFERENCES:
patent: 2631271 (1953-03-01), Thuras
patent: 4471300 (1984-09-01), Harnder et al.
patent: 4516021 (1985-05-01), Taylor
patent: 4609871 (1986-09-01), Bobb
patent: 4622460 (1986-11-01), Failes et al.
patent: 4675522 (1987-06-01), Arunkumar
Rand et al, "Interferometric Fiber-optic Magnetometers", Proc. Sensor Expo, 9/15-17, 1987, pp. 263-269; Abst only provided.
Davis et al., "An Introduction to Fiberoptic Sensors", Laser Focus, vol. 18, #2, pp. 112-115, 2/82; Abst. only.

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