The invention discloses a magnetic sensor for magnetotelluric detection. The magnetic sensor comprises a magnetic core, combined induction coils, control circuits, combined feedback coils and a selector switch module. The magnetic core is used for receiving excitation current generated by the control circuits, and thereby generating magnetic flows. The combined induction coils are used for inducing and receiving magnetic field signals and transmitting the magnetic field signals to the control circuits. The control circuits are used for processing and outputting the magnetic field signals, generating excitation current and transmitting the same to the magnetic core, and generating feedback current and transmitting the same to the combined feedback coils. The combined feedback coils are usedfor converting the circuit feedback current into magnetic fields. The selector switch module is used for switching and selecting combination and connection relations among the combined induction coils, the combined feedback coils and the control circuits. The magnetic sensor has the advantages that the problems of single function and small frequency band range of a traditional magnetic sensor aresolved, usage range of the magnetic sensor is expanded greatly, and measurement accuracy of magnetic sensor is increased.

Magnetic sensor for magnetotelluric detection

Disclosed are a passive wireless magnetic field characteristic sensing tag and sensing system and a passive wireless magnetic field characteristic sensing system-based magnetic field quantity acquisition method. Specifically, a passive resonant magnetic field sensor is used for integration in a board-level passive electronic tag, and an RFID technology-based magnetic field sensing system is built in cooperation with a reader-writer and a host computer to implement the highly precise and highly intelligent monitoring of the magnetic field quantity. By means of the design of the passive resonant magnetic field sensing tag that is compatible with single and dual sensor acquisition modes, the acquisition modes may be switched according to the control of the reader-writer, which solves the problems in which existing RFID technology-based small-scale magnetic field sensing systems have a single operation mode, the space for secondary development is small, and accuracy and sensitivity cannot be ensured. The solution of the present invention may monitor both a constant magnetic field and an alternating magnetic field, and is particularly suitable for magnetic field monitoring of power transmission devices in large power transmission centers.

Passive wireless magnetic field characteristic sensing tag and sensing system

The invention relates to a broadband composite magnetic sensor. An inductive magnetic sensor primary probe and an inductive magnetic sensor secondary probe are installed at two ends. A fluxgate sensor probe is installed at the middle position of an inductive sensor hollow magnetic core. The inductive magnetic sensor primary probe, the inductive magnetic sensor secondary probe and the fluxgate sensor probe are fixed in a shell and are connected to a conditioning circuit through multi-core shielding cables. The broadband composite magnetic sensor has a high frequency working mode and a low frequency working mode, the fluxgate sensor probe is fixed to a composite magnetic sensor structure at the middle position of the inductive magnetic sensor primary probe and the inductive magnetic sensor secondary probe. Compared with a traditional single fluxgate sensor, the broadband composite magnetic sensor has the advantages that the sensitivity of a fluxgate sensor is improved, disadvantages that the high frequency noise of the single fluxgate sensor is high, the low frequency noise of a single inductive magnetic sensor is high, and a static magnetic field can not be measured are overcome, and the measurement of a wideband and low noise magnetic field is realized.

Shi Hongyu

Papers

Broadband composite magnetic sensor