CN104703103A - Super-magnetostrictive thin film type sound sensor - Google Patents
Super-magnetostrictive thin film type sound sensor Download PDFInfo
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- CN104703103A CN104703103A CN201510131230.6A CN201510131230A CN104703103A CN 104703103 A CN104703103 A CN 104703103A CN 201510131230 A CN201510131230 A CN 201510131230A CN 104703103 A CN104703103 A CN 104703103A
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- thin film
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- magnetostrictive thin
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Abstract
The invention discloses a super-magnetostrictive thin film type sound separator. The super-magnetostrictive thin film type sound separator comprises a protecting cover, a permanent magnetic circle ring, a super-magnetostrictive thin film, a plane spiral coil, a circuit board, a first pin, a second pin and a housing; the super-magnetostrictive thin film is manufactured from a super-magnetostrictive material; an electric bridge circuit is arranged on the circuit board; an input contact in the electric bridge circuit is connected with an electrode of the plane spiral coil through a conductor; two output contacts in the electric bridge circuit are respectively connected with the first pin and the second pin; sound wave passes through the protecting cover to cause deformation of the super-magnetostrictive thin film, and the magnetic conductivity is changed, so that the initial inductive value of the plane spiral coil is changed, voltage difference occurs between the first pin and the second pin, and as a result, a sound signal is converted into an electric signal; the problem that the flexibility, stability and accuracy of the current sound sensor cannot be effectively improved can be solved.
Description
Technical field
The present invention relates to the electrical communication technology in classification chart H04, particularly relate to sound transducer.
Background technology
Sound transducer is a kind of power conversion instrument voice signal being converted to the signal of telecommunication.The kind of acoustic current sound sensor has a lot, can be divided into: electrodynamic type, condenser type, piezoelectric type, electromagnetic type etc. according to transduction principle.Operation principle is mostly, and sound makes the diaphragm oscillations in sound transducer by air, form faint current signal; Or its electric capacity is changed, forms current impedance thus produce the corresponding signal of telecommunication.
Along with the develop rapidly of modern science and technology, people are more and more higher to the guarantee of security of the lives and property consciousness, are improve one of its fail safe and effective way of avoiding this type of accident again to occur to traffic accident causation analysis.In traffic accident causation investigation, important link recovers to install the data analysis in recorder (as: black box of aircraft, the drive recorder of automobile) on a vehicle exactly, the quality of recorder tracer signal plays important effect to analysis accident cause, is thus proposed higher requirement to the aspect such as stability, sensitivity, accuracy of signals collecting transducer (as sound transducer) on recorder.
At present, mostly sound transducer is to improve from structure, such as the patent of application number 200510035114.0 proposes a kind of capacitance type sound sensor in micro mechanical and electrical structure, that the circumference of acoustic aperture is provided with a series of through hole on back pole plate, for increasing broadband, suppress the noise of below 300Hz low-frequency band; Also such as the patent of application number 201110120750.9 proposes a kind of transducer, is to project to put multiple block to prevent the adhesion of diaphragm on the face that diaphragm is relative; But due to the key factor determining the characteristics such as sound transducer stability, sensitivity, accuracy be senser, the i.e. vibration film of perceives sound, therefore application number is that the patent of 200510035114.0,201110120750.9 is in the process solving the stability of sound transducer, sensitivity, accuracy problem, and the technical problem of the senser of sound transducer could not be solved, thus fail more effectively to improve the stability of sound transducer, sensitivity, accuracy.
Summary of the invention
The object of this invention is to provide a kind of giant magnetostrictive thin film sound transducer, solution currently available technology is in the process improving the stability of sound transducer, sensitivity, accuracy, the technical problem of sound transducer senser aspect existed, and then more effectively improve the stability of sound transducer, sensitivity, accuracy.
For solving the technical problem of above-mentioned proposition, the invention provides a kind of giant magnetostrictive thin film sound transducer, it is characterized in that, comprising permanent magnetism annulus, giant magnetostrictive thin film, planar spiral winding, bridge circuit; When there being voice signal, sound wave makes giant magnetostrictive thin film produce deformation, the deformation of giant magnetostrictive thin film makes the magnetic permeability of giant magnetostrictive thin film change, the magnetic permeability change of giant magnetostrictive thin film makes the inductance value of planar spiral winding change, the change of the inductance value of planar spiral winding makes the bridge circuit being originally in poised state disequilibrate, produce voltage difference, output current.
Giant magnetostrictive thin film is the circular membrane adopting giant magnetostrictive material to make; Giant magnetostrictive thin film is attached to the round mouth of permanent magnetism annulus on the surface; Permanent magnetism annulus, giant magnetostrictive thin film and central axes parallel with planar spiral winding; Bridge circuit design on circuit boards; Planar spiral winding is through the input of wire power connection bridge circuit.
The giant magnetostrictive material that described giant magnetostrictive thin film adopts is terbium dysprosium ferrum TbDyFe alloy.
Bridge circuit comprises battery case, the first input contact, the second input contact, fixed value resistance R1, fixed value resistance R2, adjustable resistance R3, adjustable resistance R4, inductance L; First input contact and the second input contact are the input of bridge circuit; First input contact, the second input contact and fixed value resistance R1 are on a brachium pontis of bridge circuit, and the second input contact and fixed value resistance R1 connect; Fixed value resistance R2 connects with inductance L becomes another brachium pontis of bridge circuit; Adjustable resistance R3 and adjustable resistance R4 becomes two other brachium pontis of bridge circuit separately; Node between fixed value resistance R1 and fixed value resistance R2 connects one end of battery case; Node between adjustable resistance R3 and adjustable resistance R4 connects the other end of battery case.
The initial inductance value of R1=R2, L=planar spiral winding; Before using, regulating resistance R3 is equal with resistance R4, and bridge circuit is in poised state; During use, sound wave makes the initial inductance value of planar spiral winding change, and breaks the poised state of bridge circuit, makes electric bridge produce voltage difference.
Bridge circuit also comprises the first output contact as output and the second output contact; First output contact and the Node connectedness between inductance L and adjustable resistance R3; Second output contact and first inputs the Node connectedness between contact and adjustable resistance R4.
Electrode centered by the end points at planar spiral winding center; The end points of the outermost line of planar spiral winding is outer electrode; Outer electrode is through the first input contact of the first wire power connection bridge circuit; Central electrode is through the second input contact of the second wire power connection bridge circuit.
A kind of giant magnetostrictive thin film sound transducer of the present invention also comprises protective cover and housing; Permanent magnetism annulus, giant magnetostrictive thin film, planar spiral winding, circuit board package, on the round mouth of housing, are fixed in housing by described protective cover.
Housing is provided with the first pin and the second pin; First output contact connects the first pin, and the second output contact connects the second pin; The voltage difference that bridge circuit produces, through the first output contact and the second output contact, is exported by the first pin, the second pin.
After adopting the present invention, what the manufacture due to the senser of giant magnetostrictive thin film sound transducer of the present invention adopted is giant magnetostrictive material, i.e. terbium dysprosium ferrum (TbDyFe) alloy, first giant magnetostrictive material is developed by 20 century 70 Clark and Belson etc., there is magnetostrictive effect and magnetostrictive reaction, the mutual conversion of electromagnetic energy and mechanical energy can be realized; Compare with traditional magnetostrictive material (Ni, Co) with piezoelectric (PZT), it is large that giant magnetostrictive material has strain, and being 40 ~ 50 times of Ni, is 5 ~ 8 times of PZT; There is fast response time, generally below a few tens of milliseconds, even can reach Microsecond grade; Have good stability, Curie-point temperature is high, and reach more than Curie-point temperature and only temporarily can lose Magnetostrictive Properties, once be cooled to below Curie-point temperature, its Magnetostrictive Properties is recovered again completely; There is energy conversion rate high, generally reach 72%, therefore the present invention selects giant magnetostrictive material to make senser, currently available technology can be solved in the process improving the stability of sound transducer, sensitivity, accuracy, the technical problem of sound transducer senser aspect existed, and fundamentally improve the stability of sound transducer, sensitivity, accuracy;
In addition, the senser be made up of giant magnetostrictive material, the while that its sensitivity being guaranteed in selection, based on the bridge circuit of the present invention's design, according to the equilibrium condition of AC bridge, demand fulfillment R1=R2, the initial inductance value of L=planar spiral winding, namely by regulating R3=R4, keep the balance of bridge circuit, when at R1=R2, under the condition of R3=R4, as long as the initial inductance value of planar spiral winding changes, the balance of bridge circuit can be broken, produce voltage difference, output current, thus in circuit, ensure that the sensitivity of transducer of the present invention can not be impaired.
Below in conjunction with accompanying drawing, giant magnetostrictive thin film sound transducer of the present invention is described further.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of giant magnetostrictive thin film sound transducer of the present invention;
Fig. 2 is the schematic diagram of permanent magnetism annulus in giant magnetostrictive thin film sound transducer of the present invention;
Fig. 3 is the schematic diagram of giant magnetostrictive thin film in giant magnetostrictive thin film sound transducer of the present invention;
Fig. 4 is the schematic diagram of giant magnetostrictive thin film sound transducer midplane helical coil of the present invention;
Fig. 5 is the schematic diagram of bridge circuit on circuit board in giant magnetostrictive thin film sound transducer of the present invention.
1. protective covers in figure; 2. permanent magnetism annulus; 3. giant magnetostrictive thin film; 4. planar spiral winding; 5. the first wire; 6. the second wire; 7. circuit board; 8. the first pin; 9. the second pin; 10. housing; 70. bridge circuits; 71. battery cases; 72. first input contacts; 73. second input contacts; 74. first output contacts; 75. second output contacts.
Embodiment
As shown in Figure 1, the present embodiment comprises protective cover 1, permanent magnetism annulus 2, giant magnetostrictive thin film 3, planar spiral winding 4, circuit board 7 and housing 10; Protective cover 1, on the round mouth of housing 10, permanent magnetism annulus 2, giant magnetostrictive thin film 3, planar spiral winding 4, circuit board 7 encapsulation are fixed in housing 10, and giant magnetostrictive thin film 3 is attached to the round mouth of permanent magnetism annulus 2 on the surface; Permanent magnetism annulus 2, giant magnetostrictive thin film 3 and central axes parallel with planar spiral winding 4; Circuit board 7 is designed with bridge circuit 70; Planar spiral winding 4 is through the input of wire power connection bridge circuit 70; When there being voice signal, sound wave makes giant magnetostrictive thin film 3 produce deformation, this deformation makes the magnetic permeability of giant magnetostrictive thin film 3 self change, and then the inductance value of planar spiral winding 4 is changed, thus the bridge circuit 70 being originally in poised state is disequilibrated, produce voltage difference at its output, this voltage difference is finally exported by the pin on housing 10, and final realization converts the analog signal of sound to voltage signal.
As shown in Fig. 2, Fig. 3, Fig. 4, correspond respectively to the permanent magnetism annulus 2 in Fig. 1, giant magnetostrictive thin film 3 and planar spiral winding 4; Giant magnetostrictive thin film 3 is the circular membrane adopting giant magnetostrictive material to make; The giant magnetostrictive material that giant magnetostrictive thin film 3 adopts is terbium dysprosium ferrum (TbDyFe) alloy in rare earth ultra-magnetostriction material; The giant magnetostrictive thin film that giant magnetostrictive material is made, as senser, can make the performance of sound transducer especially have significant improvement in stability, sensitivity, accuracy; Electrode 41 centered by the end points at planar spiral winding 4 center; The end points of the outermost line of planar spiral winding 4 is outer electrode 42.
As shown in Figure 5, circuit board 7 is designed with bridge circuit 70; Bridge circuit 70 meets the following conditions:
The initial inductance value (initial condition, when namely without sound wave) of R1=R2, L=planar spiral winding; As R3=R4, bridge circuit 70 is in poised state, and as R3=R4, and when having sound wave, when the initial inductance value of planar spiral winding is not equal to the value of inductance L, electric bridge produces voltage difference.
Bridge circuit 70 is formed by connecting by fixed value resistance R1, fixed value resistance R2, adjustable resistance R3, adjustable resistance R4, inductance L, input contact 73, first, battery case 71, first input contact 72, second output contact 74 and the second output contact 75; First input contact 73, input contact 72, second and fixed value resistance R1 are on a brachium pontis of bridge circuit 70, and the second input contact 73 and fixed value resistance R1 connect; First input contact 72 is connected with the outer electrode 42 of planar spiral winding 4 through the first wire 5; Second input contact 73 is connected with the central electrode 41 of planar spiral winding 4 through the second wire 6; Fixed value resistance R2 connects with inductance L becomes another brachium pontis of bridge circuit 70; Adjustable resistance R3 and adjustable resistance R4 becomes two other brachium pontis of bridge circuit 70 respectively; Node between fixed value resistance R1 and fixed value resistance R2 connects one end of battery case 71; Node between adjustable resistance R3 and adjustable resistance R4 connects the other end of battery case 71; The first output contact 74 is provided with between inductance L and adjustable resistance R3; The second output contact 75 is provided with between first input contact 72 and adjustable resistance R4; The second pin 9 in the first pin 8, second output contact 75 map interlinking 1 in first output contact 74 map interlinking 1; Adjustable resistance R3 and adjustable resistance R4 should be regulated before using to make bridge circuit reach balance, through the first output contact 74 and the second output contact 75, by the voltage signal of the first pin 8, second pin 9 output sound.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection range that claims of the present invention determines.
Claims (9)
1. a giant magnetostrictive thin film sound transducer, is characterized in that, comprises permanent magnetism annulus (2), giant magnetostrictive thin film (3), planar spiral winding (4), bridge circuit (70); When there being voice signal, sound wave makes giant magnetostrictive thin film (3) produce deformation, the deformation of giant magnetostrictive thin film (3) makes the magnetic permeability of giant magnetostrictive thin film (3) change, the magnetic permeability change of giant magnetostrictive thin film (3) makes the inductance value of planar spiral winding (4) change, the change of the inductance value of planar spiral winding (4) makes the bridge circuit (70) being originally in poised state disequilibrate, produce voltage difference, output current.
2. a kind of giant magnetostrictive thin film sound transducer according to claim 1, is characterized in that, giant magnetostrictive thin film (3) is the circular membrane adopting giant magnetostrictive material to make; Giant magnetostrictive thin film (3) is attached to the round mouth of permanent magnetism annulus (2) on the surface; Permanent magnetism annulus (2), giant magnetostrictive thin film (3) and central axes parallel with planar spiral winding (4); Bridge circuit (70) design is on circuit board (7); Planar spiral winding (4) input through wire power connection bridge circuit (70).
3. a kind of giant magnetostrictive thin film sound transducer according to claim 2, is characterized in that, the giant magnetostrictive material that described giant magnetostrictive thin film (3) adopts is terbium dysprosium ferrum TbDyFe alloy.
4. according to the arbitrary described a kind of giant magnetostrictive thin film sound transducer of claim 1 or 2 or 3, it is characterized in that, described bridge circuit (70) comprises battery case (71), the first input contact (72), the second input contact (73), fixed value resistance R1, fixed value resistance R2, adjustable resistance R3, adjustable resistance R4, inductance L; The input that first input contact (72) and the second input contact (73) are bridge circuit (70); First input contact (72), the second input contact (73) and fixed value resistance R1 are on a brachium pontis of bridge circuit (70), and the second input contact (73) and fixed value resistance R1 connect; Fixed value resistance R2 connects with inductance L becomes another brachium pontis of bridge circuit (70); Adjustable resistance R3 and adjustable resistance R4 becomes two other brachium pontis of bridge circuit (70) separately; Node between fixed value resistance R1 and fixed value resistance R2 connects one end of battery case (71); Node between adjustable resistance R3 and adjustable resistance R4 connects the other end of battery case (71).
5. a kind of giant magnetostrictive thin film sound transducer according to claim 4, is characterized in that, the initial inductance value of R1=R2, L=planar spiral winding; Before using, regulating resistance R3 is equal with resistance R4, and bridge circuit (70) is in poised state; During use, sound wave makes the initial inductance value of planar spiral winding change, and breaks the poised state of bridge circuit (70), makes electric bridge produce voltage difference.
6. a kind of giant magnetostrictive thin film sound transducer according to claim 5, is characterized in that, described bridge circuit (70) also comprises the first output contact (74) as output and the second output contact (75); First output contact (74) and the Node connectedness between inductance L and adjustable resistance R3; Second output contact (75) and first inputs the Node connectedness between contact (72) and adjustable resistance R4.
7. a kind of giant magnetostrictive thin film sound transducer according to claim 1,2,3,5,6, is characterized in that, electrode (41) centered by the end points at planar spiral winding (4) center; The end points of planar spiral winding (4) outermost line is outer electrode (42); Outer electrode (42) connects the first input contact (72) of bridge circuit (70) through the first wire (5); Central electrode (41) connects the second input contact (73) of bridge circuit (70) through the second wire (6).
8., according to the arbitrary described a kind of giant magnetostrictive thin film sound transducer of claim 7, it is characterized in that, also comprise protective cover (1) and housing (10); Described protective cover (1) covers on the round mouth of housing (10), permanent magnetism annulus (2), giant magnetostrictive thin film (3), planar spiral winding (4), circuit board (7) encapsulation is fixed in housing (10).
9. a kind of giant magnetostrictive thin film sound transducer according to claim 8, is characterized in that, described housing (10) is provided with the first pin (8) and the second pin (9); First output contact (74) connects the first pin (8), and the second output contact (75) connects the second pin (9); The voltage difference that bridge circuit (70) produces, through the first output contact (74) and the second output contact (75), is exported by the first pin (8), the second pin (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510131230.6A CN104703103A (en) | 2015-03-24 | 2015-03-24 | Super-magnetostrictive thin film type sound sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510131230.6A CN104703103A (en) | 2015-03-24 | 2015-03-24 | Super-magnetostrictive thin film type sound sensor |
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| CN104703103A true CN104703103A (en) | 2015-06-10 |
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| CN201510131230.6A Pending CN104703103A (en) | 2015-03-24 | 2015-03-24 | Super-magnetostrictive thin film type sound sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548608A (en) * | 2016-01-22 | 2016-05-04 | 缪雪峰 | Magnetoelectric sensor for micro-airflow detection |
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2015
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| CN101160514A (en) * | 2004-12-08 | 2008-04-09 | 株式会社Mdt | Variable inductor type mems pressure sensor using magnetostrictive effect |
| US20080260187A1 (en) * | 2007-04-18 | 2008-10-23 | Colaizzi Vincent M | Devices and systems including transducers |
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Application publication date: 20150610 |