To overcome the difficulty of measuring the weak magnetic values of scientific exploration satellite materi-als,this study proposed a measurement method for extremely weak remanence in satellite components and devel-oped a corresponding measurement system.Shielding technology was employed to eliminate the interference of ex-ternal magnetic fields.Subsequently,a measurement system was constructed within the shielding system.The spec-trum information of the magnetic field of the rotating test piece was collected using a zero-field atomic magnetome-ter.Finally,the magnetic characteristic data of the specimen was obtained through the wavelet multiresolution anal-ysis method.The experimental results demonstrated that this method could effectively extract the extremely weak remanence signal.The system stability was better than 1×10-12 T/30 min,with a magnetic field resolution surpass-ing 1×10-12 T.Additionally,the resolution order of magnetic moment extraction reached 10-6 A·m2.The proposed method provides a pathway for ensuring magnetic cleanliness across an entire satellite and enables high-precision detection of the space magnetic field.
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