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

A technology of piezoelectric effect and AC magnetic field, which is applied in the field of new AC magnetic field sensors, can solve problems such as not forming sensors, and achieve the effects of enhanced sensitivity, high-frequency bandwidth, and high sensitivity

Inactive Publication Date: 2009-05-13
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Afterwards, Dong Shuxiang et al. in Virginia, USA published in AppliedPhysics letters, Vol.83, p4812-4814 in the United States in 2003 about sheet magnetostrictive materials / piezoelectric materials / sheet magnetostrictive material structural devices The research paper on magnetoelectric effect, the bias magnetic field in its experiment is produced by large-scale electromagnet, their research focuses on carrying out experiment discussion to this effect and the theory of this effect is carried out comparatively in-depth research, does not constitute the present invention's proposed sensor

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] figure 1 The shown sensor was prepared as follows:

[0041] (1) Cut the large-sized Terfenol-D cylindrical rod to obtain Terfenol-D thin rod 3 and thin rod 7 with a length of 10 mm, a width of 1 mm, and a height of 1 mm. The opposite sides of the thin rod 3 and thin rod 7 are polished. ;

[0042](2) Make the same width as the Terfenol-D thin rod 3 described in (1), and the PZT-5H material 5 with a thickness of 0.8mm, silver-plated layers 4 and 6 respectively on the upper and lower surfaces of the piezoelectric material 5, use CLD- 5 Bake the conductive adhesive at 80°C for 30 minutes and raise the temperature to 120°C for 3 hours, then cool to room temperature, paste PZT-5H material 5 between Terfenol-D materials 3 and 7 to form Terfenol-D / piezoelectric material / Terfenol-D laminated structure, the PZT material is polarized with a strong electric field along the thickness direction, and the voltage signal is output through the signal output lines 2 and 8 on the thin r...

Embodiment 2

[0045] Use an Agilent33220A signal generator to generate a sinusoidal signal, and provide an excitation current to the Helmertz circle, thereby generating a simulated measured alternating magnetic field near the center of the Helmertz axis. Put the sensor made in Example 1 into this magnetic field, then The sensor will output an output voltage signal or charge signal that is proportional to the input alternating magnetic field. For laterally polarized PZT materials, the piezoelectric voltage coefficient reaches 35mV / Oe;

[0046] In the frequency range of 0.5 ~ 70KHz, the sensor output voltage remains unchanged under a constant input magnetic field. When the frequency increases to 80KHz, it is the resonance frequency point. At this time, the output voltage has a peak value. At this time, the dV / dH is very high, and the magnetic sensitivity can reach 1.5V / Oe during resonance.

[0047] The frequency of the alternating signal is between 0 and 500 Hz. When the input amplitude is co...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02
Inventor 鲍丙豪
Owner JIANGSU UNIV
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