Optical fiber magnetometer for measuring D.C. and low frequency

Details Optical fiber magnetometer for measuring D.C. and low frequency Optical fiber magnetometer for measuring D.C. and low frequency

1983-03-10

1986-05-06

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Magnetometers

350376, G01R 3302, G02F 109

Patent

active

045874875

ABSTRACT:
An optical fiber magnetometer employing balanced magnetostrictive oscillations to measure D.C. and low frequency ambient magnetic fields. The magnetometer includes an optical fiber interferometer 18 having a laser beam input 10 for travel through first and second arms 14, 16 of the interferometer. First and second magnetostrictive rods 20, 22 forming a matched pair are coupled to the respective optical fibers in the first and second interferometer arms 14, 16. An applied oscillating magnetic field is applied to each of the rods 180.degree. out of phase. The D.C. or low frequency magnetic field to be measured, when combined with each of the applied fields, induces a change in the path length of each of the interferometer arms. The difference in the change in path length of each of the interferometer arms is determined to develop a signal representative of the D.C. to low frequency ambient magnetic field.

REFERENCES:
patent: 3778619 (1973-12-01), Carnel
patent: 4112367 (1978-09-01), Hepner et al.
patent: 4147979 (1979-04-01), Baues et al.
patent: 4268116 (1981-05-01), Schmadel et al.
patent: 4319186 (1982-03-01), Kingsley
patent: 4433291 (1984-02-01), Yariu et al.
Article, "Optical Fiber Magnetic Field Sensors", Dandridge et al; Electronics Letters, 5/22/80, vol. 16, No. 11, p. 408.

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