FIBEROPTIC DC MAGNETIC-FIELD SENSOR WITH BALANCED DETECTION TECHNIQUE

Abstract

We describe a balanced detection technique that suppresses undesirable effects due to residual signals for the detection of dc and low-frequency magnetic fields with interferometric fiber-optic sensors using metallic glass. The detection technique utilizes a square-wave magnetic field modulation that translates the residual signal outside of the detection band-width. Experimental results are presented that shows effective suppression of the residual signal.