Self-generation wide-band laminated magnetic induced piezoelectric effect AC magnetic field sensor and production method thereof

Abstract

A power generation type AC magnetic field sensor based on magneto piezoelectric effect is a laminated structure consisting of magnetostrictive rod, a piezoelectric material, the magnetostrictive rod and a permanent magnetic material; the upper surface and the lower surface of the piezoelectric material are provided with silver membrane electrode respectively, and the magnetostrictive rods is equipped with a signal output lead. The sensor can detect the alternating current without power supply, so the sensor is an energy-saving device with zero power consumption. The sensor has the advantages of small volume and low weight, can detect the AC magnetic field bandwidth ranging from 500Hz to 70kHz, and keeps a good linear relation between the output voltage and the magnetic field amplitude. The sensor adopts a thin rod structure, thus greatly reducing the volume of the sensor, enhancing the sensitivity and the bandwidth of the sensor. A bias magnetic field provided for the thin rod is greatly reduced for using small size of the magnetostrictive material, and can be integrated with a sensitive body. The sensor can be applicable to passive detection of the alternating magnetic fields.

Description

technical field

[0001] The invention relates to a novel AC magnetic field sensor, in particular to a power generation type broadband laminated magneto-induced piezoelectric effect AC magnetic field sensor. Background technique

[0002] With the development of information technology, the requirements for sensors are getting higher and higher. In the fields of automotive electronics, aerospace, transportation, automatic control, robotics and other fields, new, miniature, passive, high-sensitivity, linear, broadband, fast response , small mass, and low-cost sensors demand more and more intense.

[0003] In fields such as electromagnetic compatibility, power engineering, and electrical engineering, it is necessary to monitor physical quantities related to magnetic signals, such as space stray alternating magnetic fields, magnetic fields generated by motors, and magnetic fields generated by currents. The sensors currently on the market for dynamic magnetic field measurement main...

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