Experimental Investigation on the Errors of the in Situ Magnetic Measurements in Hydrostatic High Pressure Vessel (3)－Comprehensive Consideration of Two Influences

In order to investigate the errors of the primary coil with multiple electric solenoid, we selected two samples using different slice-number (n=1, 3) of amorphous alloy Fe46.3Co0.03Ni46.5Si3.75V0.92B2.5 ribbon, inserted into the 13 layers electric solenoid and measured the magnetization, magnetic permeability curve and initial magnetization curves, separately, in the hydrostatic pressure vessel and under other four different ambient conditions. (1) We find that there exist both a demagnetic field H' of the magnetized sample and a demagnetic field H'' of the neighbor iron magnetized by leakage flux. (2) To reduce the influence of H', we take one slice of amorphous alloy ribbon as the sample, but the influence of H'' becomes serious as the errors of m and i increase to m/m=50%, i/i＝104%. (3) Comprehensively taking into account these two influences, we take three slices of amorphous alloy ribbon as the sample, although the influence of H' increases a little, the influence of H'' is weakened significantly, so the errors of m and i decrease to m/m=29%, i/i＝15.5%.