CN101882919A - A magnetic sensor transducer - Google Patents

Abstract

Translated fromChinese

本发明属于压电器件，一种高性能磁电传感换能器。随着科学技术的进步，人们对探测的灵敏度要求越来越高。由于材料性能的限制，进一步提升磁电系数，提高探测的灵敏度仍然是一个迫切需要解决而又难以解决的重要课题。本发明包括磁致伸缩材料(1)、压电材料(2)和磁致伸缩材料(3)，三层材料之间用绝缘胶粘接，三层材料的厚度比例优化为1∶0.6-1∶1；压电材料为铌镁酸铅-钛酸铅单晶材料。本发明的优点是：具有多端输出；输入端，低频下具有平坦的频率响应，适用于传感器件；输出端，在谐振态下具有高电压输出，适用于高性能的换能器件；结构简单，制作方便；无需供电，响应快。

The invention belongs to a piezoelectric device, which is a high-performance magnetoelectric sensor transducer. With the advancement of science and technology, people have higher and higher requirements for detection sensitivity. Due to the limitations of material properties, further increasing the magnetoelectric coefficient and improving the detection sensitivity is still an important issue that needs to be solved urgently but is difficult to solve. The present invention includes magnetostrictive material (1), piezoelectric material (2) and magnetostrictive material (3), the three-layer materials are bonded with insulating glue, and the thickness ratio of the three-layer materials is optimized to be 1:0.6-1 : 1; the piezoelectric material is lead magnesium niobate-lead titanate single crystal material. The invention has the advantages of: having multi-terminal output; the input end has a flat frequency response at low frequency and is suitable for sensor devices; the output end has high voltage output in a resonant state and is suitable for high-performance transducer devices; the structure is simple, Easy to make; no power supply required, quick response.

Description

A kind of magnetic-electric sensing transducer

Technical field

The invention belongs to piezoelectric device, specifically a kind of high-performance magnetic-electric sensing transducer.

Background technology

Piezoelectric is to be under pressure to make voltage appears in the time spent between both ends of the surface crystalline material.Utilize the characteristic of piezoelectric can realize mutual conversion between mechanical energy and electric energy.Piezoelectric is widely used in multiple sensors, transducer, the driver, in the every profession and trade of modern military, science and technology, national economy, field etc. important use is arranged all.

Wherein, effective detection of low-intensity magnetic field is subjected to the attention of height on military and civilian, it is widely used in various fields such as earth magnetic field detection, ocean magnetic field detection, the magnetic-field measurement of human body brain, magnetic noise measurement, has the irreplaceable advantage of other acquisition of signal mode.In early days with Cr₂O₃Single-phase magnetoelectric material for representative, because its serviceability temperature scope is mostly all far below room temperature, and magnetoelectricity electric field coefficient only is 20mV/cmOe, magnetoelectric effect is smaller, make these single-phase magnetoelectric materials be difficult to obtain actual application, in the last few years, the scientific research personnel is based on piezoelectric effect and magnetostrictive effect, prepared a series of piezoelectricity/magnetostriction composite material, improved magnetic-electric coefficient greatly, with existing conventional magnetoelectric material, as monophase materials, the ferroelectric-ferromagnetic mixed sintering, materials such as ferroelectric-ferromagnetic film composite material are compared, the magnetic electricity performance of laminar composite has improved more than 100 times, and the sensitivity of the magnetoelectric transducer of making also significantly improves.Along with progress of science and technology, people require more and more higher to the sensitivity of surveying.But because the restriction of material property further promotes magnetic-electric coefficient, the sensitivity that improves detection remains one and presses for solution and insoluble important topic.The present invention is based on high-performance monocrystalline piezoelectric material PMN-PT and dynamo-electric transformation effect,, invented a kind of simple in structure, volume is little, sensitivity is higher magnetic-electric sensing transducer by optimizing the piezoelectric structure, regulating size and distribution of electrodes.

Summary of the invention

The purpose of this invention is to provide magnetic-electric sensing transducer simple in structure, that volume is little, sensitivity is higher.

The object of the present invention is achieved like this:

A kind of magnetic-electric sensing transducer is made up of magnetostrictive material and piezoelectric, and is bonding with insulating cement between the magnetostrictive material trilaminate material of the magnetostrictive material on top, the piezoelectric at middle part and bottom; The thickness proportion of trilaminate material is 1: 0.6-1: 1; Piezoelectric is the niobic magnesium acid lead-lead titanate single-crystal material.

The chemical composition of niobic magnesium acid lead-lead titanate single-crystal material is (1-x) Pb (Mg_1/3Nb_2/3O₃)-xPbTiO₃(PMN-PT), the optimal component scope that is used for preparing this device is 0.28＜x＜0.33, and crystallographic orientation is＜001〉direction.

Magnetostrictive material be have remarkable magnetostrictive effect, can convert electrical energy into mechanical energy or mechanical energy is converted to the magnetic materials such as metal, alloy and ferrite of electric energy, English name: magnetostrictive material.

Magnetic-electric sensing transducer structure of the present invention as shown in Figure 1, for having the layer structure of magnetostrictive material-piezoelectric-magnetostrictive material.Connect with the thin insulating cement of one deck between the importation of magnetostrictive material, piezoelectric and the magnetostrictive material, realize mechanical couplings, the thickness proportion after the trilaminate material optimization is 1: 0.6-1: 1.Utilize the magnetostrictive material realization magnetic field energy of upper and lower part and the transformation between elastic energy, be delivered to the importation of piezoelectric then,, produce voltage signal output V in the importation of piezoelectric by direct piezoelectric effect_Out1, this elastic energy is delivered to the output of piezoelectric simultaneously, owing to mechanical electric coupling, has obtained the voltage signal V of further amplification under resonance frequency_Out2

Piezoelectric as shown in Figure 2 also can be realized output of magnetoelectricity signal and the function of further amplifying simultaneously.Whole piezoelectric is divided into two parts, along its length Ji Hua importation and output; Also be provided with input electrode, common ground electrode, output electrode.When the importation is subjected to effects of strain,, between importation and earth terminal, export voltage signal very stably under the low frequency by inverse piezoelectric effect.Simultaneously, this strain meeting is delivered to output, by dynamo-electric transformation effect, is producing enlarge-effect between output and ground under the resonance attitude, the voltage signal after obtaining amplifying, thus improve magnetic-electric coefficient greatly.

Advantage of the present invention is:

1, provides multiterminal output.Have the flat frequency response under the input, low frequency, be applicable to senser element; Output has high voltage output under the resonance attitude, be applicable to high performance energy transducer.

2, simple in structure, easy to make.

3, need not power supply, response is fast.

Description of drawings

Fig. 1 is the structural representation of magnetic-electric sensing transducer spare.

Among the figure: 1 is magnetostrictive material; 2 is piezoelectric; 3 is magnetostrictive material; 4 is voltage output end; The 5th, the common ground end; 6 is voltage output end;

Fig. 2 is the structure chart with piezoelectric of enlarge-effect.

Among the figure: 7 is the importation, along its length polarization; 8 is output, along its length polarization; 9 is the importation electrode; 10 is the common ground electrode, and 11 is output electrode.

Fig. 3 is the step-up ratio curve with piezoelectric of enlarging function.

Fig. 4 is the change curve of the importation magnetic-electric coefficient of magnetic-electric sensing transducer spare with frequency, the magnetic-electric coefficient α of corresponding piezoelectric importation_V

Fig. 5 is the change curve of the output magnetic-electric coefficient of magnetic-electric sensing transducer spare with frequency, the magnetic-electric coefficient α of corresponding piezoelectric output_V

Execution mode

The present invention will be further described below by embodiment.

The embodiment of theinvention 1,2,3 is the complete procedure of preparation magnetic-electric sensing transducer spare; Step-up ratio to piezoelectric with enlarging function is tested with frequency variation characteristics; Transducer response is tested with the field signal frequency variation characteristics.

Embodiment 1:

Magnetic-electric sensing transducer spare structure as shown in Figure 1, selecting improved Bridgman (Bridgman) method growth components for use is PMN-PT (PMN-PT) monocrystalline of 0.28＜x＜0.33, crystal orientation is＜001〉direction, makes piezoelectric 2.Terfenol-D (terbium dysprosium ferrum) alloy is made magnetostrictive material 1 and magnetostrictive material 3.PMN-PT (PMN-PT) is of a size of 16 * 2 * 2mm³, Terfenol-D (terbium dysprosium ferrum) is of a size of 6 * 2 * 2mm³Extraction electrode 4,5 and 6 on 2.1, the nonconducting epoxide-resin glue of bonding employing between 2 and 3, two-layer magnetostrictive material and piezoelectric well insulate and mechanical couplings about making.

Embodiment 2:

Making has the piezoelectric of enlarging function, and as shown in Figure 2: left-half is adrive part 7, and right half part is an output 8, polarization all along its length, shown in arrow among Fig. 2, electrode position is shown in Fig. 9,10 and 11,electrode 9 and 11 is full electrode, and the width ofelectrode 10 is 1mm.

During the step-up ratio curve of the piezoelectric with enlarging function of test, signal generator links to each other withearth terminal 10 withinput 9, and oscilloscope links to each other withearth terminal 10 with output 11.Test result as shown in Figure 3, when the 115kHz left and right sides, step-up ratio can reach 30 times.

Embodiment 3:

The test magnetic-electric coefficient:

For making the strain energy of magnetostrictive material effectively be delivered to piezoelectric, therefore choose the approaching Terfenol-D of length (terbium dysprosium ferrum) and adhere on the piezoelectric 2, Terfenol-D (terbium dysprosium ferrum) is of a size of 6 * 2 * 2mm³Withembodiment 11,2 and 3 the combination finish after, test its magnetic-electric coefficient, the magnetic field amplitude of input is 1Oe, frequency range is 1-175kHz, the result shows, under the bias magnetic field of 800Oe the best, and the importation, in the 1-50kHz scope, has stable voltage signal output, magnetic-electric coefficient α_VReach 315mV/Oe; Under the resonance attitude, signal after amplifying at output magnetic-electric coefficient α_VUp to 7.86V/Oe.

Magnetic-electric sensing transducer spare of the present invention can provide multiterminal output, for input, has the flat frequency response under the low frequency, be suitable for senser element,, under the resonance attitude, have high voltage output for output, be fit to high performance energy transducer, and, also have simple in structure, easy to make, need not power supply, respond advantages such as fast.

The foregoing description only is a preference of the present invention, is not used for limiting the present invention, and all within principle of the present invention, any modifications and variations of being done are all within protection scope of the present invention.

Claims (2)

1. magnetic-electric sensing transducer, form by magnetostrictive material (1) and piezoelectric (2), it is characterized in that: bonding with insulating cement between magnetostrictive material (3) trilaminate material of the piezoelectric (2) at the magnetostrictive material on top (1), middle part and bottom, the thickness proportion of trilaminate material is 1: 0.6-1: 1; Piezoelectric is the niobic magnesium acid lead-lead titanate single-crystal material.

2. magnetic-electric sensing transducer according to claim 1 is characterized in that: the chemical composition of niobic magnesium acid lead-lead titanate single-crystal material is (1-x) Pb (Mg_1/3Nb_2/3O₃)-xPbTiO₃(PMN-PT), the optimal component scope that is used for preparing this device is 0.28＜x＜0.33, and crystallographic orientation is＜001〉direction.

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