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This lecture covers the principles and applications of magnetic field measurement using Hall sensors. It explains the use of soft ferromagnetic materials in magnetic circuits to improve resolution. The lecture also discusses the operating principle of flow sensors based on the Lorentz force. Additionally, it delves into the detection of harmonics in magnetization and the synchronization demodulation process. The presentation explores the asymmetrical and symmetrical saturation of magnetization in the presence and absence of external magnetic fields. It concludes with details on readout electronics, pick-up coils, and specifications of integrated CMOS fluxgate sensors.