Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1984-05-15
1986-07-15
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Magnetometers
324260, G01R 3302
Patent
active
046008853
ABSTRACT:
A fiber optic magnetometer for detecting DC magnetic fields includes a first optical fiber having a magnetostrictive jacket thereon which defines a sensing arm, and a second fiber defining a reference arm. An AC magnetic field of frequency .omega..sub.o and constant amplitude is imposed on the magnetostrictive jacket so as to cause a time varying optical path length change, having an .omega..sub.o component, in the sensing arm fiber. This induces a corresponding time varying phase shift, also having an .omega..sub.o component, in light transmitted through the sensing arm fiber which is detected by a phase detector. The phase detector produces a signal proportional to the phase shift, this signal being passed to a lock-in amplifier set to amplify at .omega..sub.o. The lock-in amplifier produces an output signal proportional to the amplitude of the .omega..sub.o component, wherein this amplitude is proportional to any DC magnetic fields to which the device is exposed.
REFERENCES:
patent: 4147979 (1979-04-01), Baues et al.
patent: 4376248 (1983-03-01), Giallorenzi et al.
patent: 4378497 (1983-03-01), Giallorenzi
patent: 4433291 (1984-02-01), Yariv et al.
Rashleigh, S.C., Magnetic-Field Sensing with a Single Mode Fiber, 01-81, . 6, No. 1/Optics Letters, pp. 19-21.
Electron Lett. 16, 408-409 (1980), Dandridge, et al.
Optics Letters, vol. 7, No. 7, Jul. 1982, (Koo, et al.).
Dandridge Anthony
Koo Kee P.
Sigel, Jr. George H.
Tveten Alan B.
Beers Robert F.
Eisenzopf Reinhard J.
Mueller Robert W.
Sharp William R.
Sheinbeing Sol
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