Patent ID: 11914092
Assignee: INSTITUTE OF GEOLOGY AND GEOPHYSICS, CHINESE ACADEMY OF SCIENCES
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An inductive magnetic sensor, comprising: a signal pre-amplifying measurement circuit, a feedback loop, a magnetic core and coil group, and an output protection module, wherein the magnetic core and coil group is electrically connected between the signal pre-amplifying measurement circuit and the feedback loop, the signal pre-amplifying measurement circuit comprises a low-noise autozero processing circuit, and both the feedback loop and the low-noise autozero processing circuit are electrically connected to the output protection module; the signal pre-amplifying measurement circuit comprises two groups of pre-amplifying units and resonant notch filters, which are a first pre-amplifying unit, a second pre-amplifying unit, a first resonant notch filter and a second resonant notch filter, the first resonant notch filter and the second resonant notch filter are connected together via first resistors to output as an output terminal, and the output terminal is connected in parallel with a grounding capacitor to a reference ground.