Harbin Institute of Technology

Yinxi Jin

Liyi Li

Donghua Pan

Shengxin Lin

Kai Song

Yuxi Liu

Zhiyin Sun

Zhilong Zou

Yuhang Ge

A demagnetization method for a multilayer shielding apparatus is provided. In the demagnetization method, the demagnetization is realized on the basis of a demagnetization coil system. The demagnetization coil system includes a plurality of turns of demagnetization coils (), a plurality of connection wires and a power supply module. The multilayer shielding apparatus includes at least two layers of shielding bodies (); all the layers of shielding bodies () are sleeved layer by layer from inside to outside; a plurality of turns of demagnetization coils () are wound on each layer of shielding bodies () at intervals; and one half of each turn of demagnetization coils () is located inside the wound shielding bodies (), and the other half is located outside the wound shielding bodies (). Each demagnetization coil () is connected to the power supply module through the corresponding connection wire.

Demagnetization method for multilayer shielding apparatus

Disclosed is a method for analyzing a blind zone of a magnetic detection method that can provide a complete distribution map of the detection blind zone within the entire zone of the magnetic target. The method comprises the first step of establishing a complete magnetic detection model to obtain calculated position and magnetic moment of a magnetic target that is detected by a magnetic gradiometer. The second step involves establishing a direction-attitude-sphere model to represent the entire zone of the magnetic target. The third step involves expanding the direction-attitude-sphere to a planar map layered by latitude and calculating success detection rates within the planar expansion map. Finally, the distribution map of the magnetic detection blind zone in the entire zone is visually presented in the planar expansion map and a complete distribution rule of the entire detection blind zone is thus obtained. This blind zone analysis method is applicable to any magnetic detection method and can provide a visual presentation of the entire detection blind zone. The knowledge of the detection blind zone can be applied to guide practical magnetic detection to avoid the detection blind zone so as to increase the detection accuracy.

Method for analyzing magnetic detection blind zone

Provided is a method for designing a magnetic gradiometer based on the combined influence of multiple influencing parameters. The method takes into consideration of synergetic interaction of the influencing parameters on the performance of a magnetic gradiometer. It analyzes detection errors within the entire zone of all possible directions and attitudes of a magnetic target under the influence of various influencing parameters, uses the detection accuracy and detection success rate to measure the performance of the magnetic gradiometer accurately and objectively, and finally obtains the influence rule of the influencing parameters on the performance of the magnetic gradiometer. Based on the knowledge of the combined influence of multiple influencing parameters, the magnetic gradiometer can be designed to have high detection accuracy and success rate and high cost-efficiency.

Method for making a magnetic gradiometer with high detection accuracy and success rate

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Harbin, China

Yinxi Jin