Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1986-02-20
1987-12-08
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Magnetometers
350375, G01R 3302, G02B 530, G02F 129, G02F 131
Patent
active
047120657
ABSTRACT:
In a fiber optic interferometric magnetic sensor or magnetic gradient detector a magnetic bias field is applied to a magnetically sensitized portion of an optical fiber by means which are driven by optical power whereby a completely passive sensor head arrangement may be achieved. In a magnetic gradient detector optical power from a high power laser (34) may be supplied via an optical fiber (35) to illuminate a solar cell 27 to whose electrical output terminals solenoids (25,26) are connected. A portion of a respective optical fiber (21, 22) which is magnetically sensitized, by for example bonding to a strip of magnetostrictive material (23, 24), is disposed inside each solenoid (25, 26).
REFERENCES:
patent: 4600885 (1986-07-01), Koo et al.
K. P. Koo, A. Dandridge, A. B. Tveten, and G. H. Sigel, Jr., "A Fiber-Optic DC Magnetometer", IEEE Journal of Lightwave Technology, vol. LT-1, No. 3, Sep. 1983, pp. 524-525.
K. P. Koo and G. H. Sigel, Jr., "A Fiber-Optic Magnetic Gradiometer", IEEE Journal of Lightwave Technology, vol. LT-1, No. 3, Sep. 1983, pp. 509-513.
Extance Philip
Jones Roger E.
Pitt Gillies D.
Eisenzopf Reinhard J.
Snow Walter E.
STC PLC
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