High stability fiber optic magnetic field sensor with enhanced l

Details High stability fiber optic magnetic field sensor with enhanced l High stability fiber optic magnetic field sensor with enhanced l

1985-11-07

1986-07-01

Buczinski, S. C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, H01J 516

Patent

active

H00000949

ABSTRACT:
A fiber optic interferometer-type magnetic field sensor which uses an automatic feedback system to limit the range of the magnetic field experienced by the sensor element. A high frequency bias field is mixed with the external magnetic field to be measured and the resulting interferometer output signal is converted to an electric output signal. The electric output signal is mixed with a reference signal having the same frequency as the bias signal to form a baseband negative feedback signal which is converted to a magnetic field and mixed with the bias and external fields to provide automatic feedback.

REFERENCES:
patent: 4433291 (1984-02-01), Yariv et al.

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