Fiber optic faraday flux transformer sensor and system

Details Fiber optic faraday flux transformer sensor and system Fiber optic faraday flux transformer sensor and system

1993-10-22

1996-10-22

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324 96, G01R 33032, G01R 1900

Patent

active

055680496

ABSTRACT:
A fiber optic Faraday flux transformer sensor is disclosed which comprises: a closed loop of wire being responsive to a first time-varying magnetic field from a remote source for producing a secondary time-varying magnetic field which varies as a function of the first time-varying magnetic field, and an optical fiber loop having a plurality of turns arranged in a preselected configuration adjacent to the closed loop of wire and adapted to receive and pass therethrough input light having a fixed state of linear polarization. The optical fiber loop is responsive to the secondary time-varying magnetic field and to the input light for producing light having a polarization state which changes as a function of the secondary time-varying magnetic field applied thereto. In a system implentation, an optical source transmits light having a linear state of polarization to a first polarizer, which selects and sends a fixed predetermined state of polarization to the fiber optic Faraday flux transformer sensor. A second polarizer converts the resultant light from the fiber optic Faraday flux transformer sensor into an output light which changes in intensity as a function of the changing polarization state of the resultant light. A photodetector converts this output light into an electrical signal which varies in amplitude as a function of the time-varying magnetic field from the remote source.

REFERENCES:
patent: 3621390 (1971-11-01), Von Willisen
G. W. Day and A. H. Rose, "Faraday Effect Sensors: The State of the Art", IE vol. 985 Fiber Optic and Laser Sensors VI pp. 138-150 (1988).
A. D. Kersey, F. Bucholtz and A. Dandridge, "Sensitivity-Bandwidth Limitations In Optical-Fibre Farady-Rotation Current Sensors", International Journal of Optoelectronics, vol. 3, No. 4, pp. 323-332, (1988).
F. Bucholtz, K. P. Koo, A. D. Kersey and A. Dandridge, "Fiber Optic Magnetic Sensor Development", SPIE vol. 718, Fiber Optic and Laser Sensors IV, pp. 56-65 (1986).

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