Magnetic sensor

Abstract

The invention provides a magnetic sensor comprising: a support structure; and three mutually orthogonal layered magnetoelectric composite materials embedded on the support structure, each of the layered magnetoelectric composite materials being formed of a piezoelectric material layer, two magnetostrictive material layers, two self-biasing material layers and four adhesive material layers. The magnetic sensor of the invention has the advantages of low power consumption, small volume, high stability, small fractional bandwidth, vector type and good orthogonality.

Description

technical field [0001] The invention relates to a magnetic sensor, in particular to a miniature vector magnetic sensor used in indoor precise positioning or endoscope capsule positioning. Background technique [0002] The wireless capsule endoscope is a major breakthrough in endoscopy. It overcomes the two shortcomings of the traditional cable endoscope: it is difficult to achieve a complete small intestine inspection and it brings great pain to the patient, so the development potential is huge. However, in order to further promote capsule endoscopy, problems such as determination of pathological tissue location, active control of capsule movement, image quality, and observation of pathological tissue must be solved. These problems are related to the positioning of the capsule. The schematic diagram of the capsule endoscope module is shown in figure 1 shown. There are several methods for positioning capsule endoscopes. One of the methods is the positioning technology based...

AI Technical Summary

Problems solved by technology

[0002] The wireless capsule endoscope is a major breakthrough in endoscopy, it overcomes the two shortcomings of the traditional cable endoscope: it is difficult to achieve a complete small intestine inspection and it brings great pain to the patient, so the development potential is huge

The second method requires high power consumption and is only used in endoscopes with cables

However, this structure requires a relatively large magnet to provide a bias magnetic field. In the medical environment, many kinds of medical equipment do not allow ferromagnetic materials to be introduced into the medical environment.

Moreover, the magnet will affect the ferromagnetic surgical equipment (such as scissors, tweezers), etc., which will seriously affect the accuracy of the doctor's operation

Therefore, the magnetoelectric magnetic sensor of this structure cannot be applied in the medical industry, let alone in the precision capsule endoscope.

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