CN105136898A - Flexoelectric-dynamic-effect direct detection device and method based on charge detection - Google Patents
Flexoelectric-dynamic-effect direct detection device and method based on charge detection Download PDFInfo
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Abstract
The invention discloses a flexoelectric-dynamic-effect direct detection device and method based on charge detection. The device comprises an upper double-face metal electrode plate and a lower double-face metal electrode plate which are arranged on the upper surface and the lower surface of a tested piece respectively. A lower metal electrode of the upper double-face metal electrode plate is in contact with the upper surface of the tested piece. An upper metal electrode of the lower double-face metal electrode plate is in contact with the lower surface of the tested piece. An upper metal electrode of the upper double-face metal electrode plate is connected with a lower metal electrode of the lower double-face metal electrode plate through a ground wire. The upper metal electrode of the lower double-face metal electrode plate is connected with a lead for measuring a charge signal, and the lead is connected with a charge amplifier and a display storage device in sequence. The lateral side of the tested piece is connected with a high-frequency ultrasonic probe, and the high-frequency ultrasonic probe is connected with a power amplifier and a high-frequency pulse generator through a lead in sequence. The invention further provides the detection method. Charges output by the tested piece are detected by exciting high-frequency ultrasonic waves, and direct detection of the flexoelectric dynamic effect can be conveniently and easily achieved.
Description
Technical field
This experimental technique relates to flexure electro dynamic effect detection technical field, is specifically related to a kind of flexure electro dynamic effect direct-detection amount device and method based on detecting electric charge.
Background technology
Stress-electric coupling phenomenon is extensively present in various artificial and natural material.Piezoelectric is a kind of important intellectual material, can produce electric polarization, otherwise can produce mechanically deform in the electric field time this material is subject to mechanical stress effect.Piezoelectric effect results from the relative displacement between crystal Atom, and only has asymmetric crystal to produce piezoelectric effect.Flexoelectric effect refers to and produces polarization by heterogeneous strain field or strain gradient, with piezoelectric effect unlike, in time for centrosymmetrical crystal, flexoelectric effect can be that material produces electric polarization equally.In solid atomic crystal, strain gradient makes atom have relative displacement heterogeneous, thus the inverting destroying crystal is symmetrical, in crystal, produce polarization.Because piezoelectric effect is produced by homogeneous strain, flexoelectric effect is produced by strain heterogeneous, and the difference in this mechanism result in macro-scale lower piezoelectric effect comparatively obvious, and under micro-scale, flexoelectric effect can not be left in the basket.Due to the requirement to crystal structure symmetry relative loose, flexoelectric effect is prevalent in all dielectrics, comprises non-piezoelectric material and isotropic material.
When high-frequency ultrasonic is by medium, ultrasound wave wavelength and lattice lengths close to time, vibration can produce the strain gradient of the time of depending on, and strain gradient can produce the polarization displacement of ion.For ultrasound wave, the acceleration of atom is proportional to strain gradient, and the acceleration of the ion of different quality produces extra polarization displacement, thus produces flexure electro dynamic effect, produces polarization charge.Flexure electro dynamic effect is normally defined:
Wherein μ
d=-χ cM/ ρ is Dynamic flexural electrostrictive coefficient.M is the coefficient calculated by lattice dynamics.ε is the elastic strain of material, and x is the direction of gradient, and P is the polarization that the strain gradient caused by flexoelectric effect produces, and ρ is density, and c is elastic constant.Under International System of Units, the unit of flexoelectric coefficient is C/m.
Flexure electric-type material selection range is wider, and environment and mankind's friendly material can be used to the function elements such as preparation flexure electric-type sensor, driver.Such research flexure electro dynamic theory and detection method just have very important scientific research engineering significance.Up to now, pick-up unit and the method for flexure electro dynamic effect are still blank, and a kind of high frequency ultrasound wave excitation of design detects pick-up unit and the method for flexure electro dynamic effect now, by direct-detection output charge, carry out test material flexure electro dynamic effect, experimental technique simple possible.
Summary of the invention
The object of this experiment is to provide a kind of flexure electro dynamic effect direct-detection amount device and method based on detecting electric charge, in test specimen, strain gradient is produced by excitation high-frequency ultrasonic, thus measure occur flexoelectric effect produce electric charge, detect measure and monitor the growth of standing timber material flexure electro dynamic effect.
In order to reach above object, the present invention adopts following technical scheme:
A kind of flexure electro dynamic effect direct-detection device based on detecting electric charge, comprise the upper double-sided metal electrode slice 1 and lower double-sided metal electrode slice 3 that are separately positioned on test specimen 2 upper surface and lower surface, the upper and lower surface of described upper double-sided metal electrode slice 1 is respectively arranged with metal electrode and lower metal electrode, and the lower metal electrode of upper double-sided metal electrode slice 1 contacts with the upper surface of test specimen 2; The upper and lower surface of described lower double-sided metal electrode slice 3 is respectively arranged with metal electrode and lower metal electrode, and the upper metal electrode of lower double-sided metal electrode slice 3 contacts with the lower surface of test specimen 2; The upper metal electrode of described upper double-sided metal electrode slice 1 and the lower metal electrode of lower double-sided metal electrode slice 3 are by ground wire 6) be connected; The upper metal electrode of described lower double-sided metal electrode slice 3 connects the lead-in wire 10 measuring charge signal, and the lead-in wire 10 of described measurement charge signal connects charge amplifier 11 and display memory storage 12 successively; The side of described test specimen 2 is connected with high frequency ultrasound probe 4 by couplant 5, and high frequency ultrasound probe 4 is connected with power amplifier 8 and high frequency pulse generator 9 successively by lead-in wire 7.
Described upper double-sided metal electrode slice 1 and lower double-sided metal electrode slice 3 are pcb board.
The upper metal electrode of described ground wire 6 and upper double-sided metal electrode slice 1 and lower double-sided metal electrode slice 3) lower metal electrode be connected by the mode of wire bonding.
The lead-in wire 10 of described measurement charge signal is connected by the mode of wire bonding with the upper metal electrode of lower double-sided metal electrode slice 3.
Described display memory storage 12 is oscillograph.
The detection method of pick-up unit described above, high frequency pulse generator 9 produces electric signal, by go between 7 be transferred to power amplifier 8 amplifying power after, excitation high frequency ultrasound probe 4 produces high-frequency ultrasonic, when high-frequency ultrasonic is by test specimen 2, be subjected to displacement and produce strain gradient, polarization charge is produced in test specimen 2 upper and lower surface again by flexoelectric effect, test specimen 2 lower surface electric charge passes in charge amplifier 11 by the upper metal electrode of lower double-sided metal electrode slice 3 via the lead-in wire 10 measuring charge signal, in display memory storage 12, storage is shown after being converted into magnitude of voltage,
When high-frequency ultrasonic is by test specimen 2, ultrasound wave wavelength and lattice lengths close to time, vibration can produce the strain gradient of the time of depending on, and strain gradient can produce the polarization displacement of ion; For high-frequency ultrasonic, the acceleration of atom is proportional to strain gradient, and the acceleration of the ion of different quality produces extra polarization displacement, thus produces flexure electro dynamic effect, and produce polarization charge, its expression formula is:
U＝kQ
Wherein μ
d=-χ cM/ ρ is Dynamic flexural electrostrictive coefficient, and M is the coefficient calculated by lattice dynamics, and ρ is density, and c is elastic constant; μ is static flexoelectric coefficient, ε is the elastic strain of material, x is the direction of gradient, P is the polarization that the strain gradient caused by flexoelectric effect produces, Q is the upper metal electrode output charge of lower double-sided metal electrode slice 3, k is electric charges amplify coefficient, and U is the output quantity of magnitude of voltage, and H is the material test specimen lower surface length of side.Can be found out by formula, as long as detect output charge value, just can detect flexure electro dynamic effect.
The present invention has the following advantages:
1) pick-up unit and the method that up to now, bend electro dynamic effect are still blank.The present invention has filled up the blank of this respect, for more deep research provides experimental technique and thinking.
2) the present invention adopts and directly measures electric charge, and charge amplifier can detect small charge variation and amplify, and does not need to use the phase-locked current amplifier of high precision to measure electric current, tests simple and reliable.
3) required instrument is only high-frequency ultrasonic excitation set, charge amplifier and oscillograph, is easy to operation.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.As shown in drawings, a kind of flexure electro dynamic effect direct-detection device based on detecting electric charge of the present invention, comprise the upper double-sided metal electrode slice 1 and lower double-sided metal electrode slice 3 that are separately positioned on test specimen 2 upper surface and lower surface, the upper and lower surface of described upper double-sided metal electrode slice 1 is respectively arranged with metal electrode and lower metal electrode, and the lower metal electrode of upper double-sided metal electrode slice 1 contacts with the upper surface of test specimen 2; The upper and lower surface of described lower double-sided metal electrode slice 3 is respectively arranged with metal electrode and lower metal electrode, and the upper metal electrode of lower double-sided metal electrode slice 3 contacts with the lower surface of test specimen 2; The upper metal electrode of described upper double-sided metal electrode slice 1 is connected by ground wire 6 with the lower metal electrode of lower double-sided metal electrode slice 3; The upper metal electrode of described lower double-sided metal electrode slice 3 connects the lead-in wire 10 measuring charge signal, and the lead-in wire 10 of described measurement charge signal connects charge amplifier 11 and display memory storage 12 successively; The side of described test specimen 2 is connected with high frequency ultrasound probe 4 by couplant 5, and high frequency ultrasound probe 4 is connected with power amplifier 8 and high frequency pulse generator 9 successively by lead-in wire 7.
As the preferred embodiment of the present invention, described upper double-sided metal electrode slice 1 and lower double-sided metal electrode slice 3 are pcb board.
As the preferred embodiment of the present invention, the upper metal electrode of described ground wire 6 and upper double-sided metal electrode slice 1 and lower double-sided metal electrode slice 3) lower metal electrode be connected by the mode of wire bonding.The lead-in wire 10 of described measurement charge signal is connected by the mode of wire bonding with the upper metal electrode of lower double-sided metal electrode slice 3.Like this, the electric charge produced by test specimen flexoelectric effect just can be outputted in externally measured instrument by lead-in wire.
As the preferred embodiment of the present invention, described display memory storage 12 is oscillograph.
As shown in drawings, the detection method of pick-up unit of the present invention, high frequency pulse generator 9 produces electric signal, by go between 7 be transferred to power amplifier 8 amplifying power after, excitation high frequency ultrasound probe 4 produces high-frequency ultrasonic, when high-frequency ultrasonic is by test specimen 2, because this wavelength dimension is by just causing the vibration of atom during test specimen, thus be subjected to displacement and produce strain gradient, polarization charge is produced in test specimen 2 upper and lower surface again by flexoelectric effect, test specimen 2 lower surface electric charge passes in charge amplifier 11 by the upper metal electrode of lower double-sided metal electrode slice 3 via the lead-in wire 10 measuring charge signal, memory storage 12 is being shown after being converted into magnitude of voltage) middle display storage,
When high-frequency ultrasonic is by test specimen 2, ultrasound wave wavelength and lattice lengths close to time, vibration can produce the strain gradient of the time of depending on, and strain gradient can produce the polarization displacement of ion; For high-frequency ultrasonic, the acceleration of atom is proportional to strain gradient, and the acceleration of the ion of different quality produces extra polarization displacement, thus produces flexure electro dynamic effect, and produce polarization charge, its expression formula is:
U＝kQ
Wherein μ
d=-χ cM/ ρ is Dynamic flexural electrostrictive coefficient, and M is the coefficient calculated by lattice dynamics, and ρ is density, and c is elastic constant; μ is static flexoelectric coefficient, ε is the elastic strain of material, x is the direction of gradient, P is the polarization that the strain gradient caused by flexoelectric effect produces, Q is the upper metal electrode output charge of lower double-sided metal electrode slice 3, k is electric charges amplify coefficient, and U is the output quantity of magnitude of voltage, and H is the material test specimen lower surface length of side.Can be found out by formula, as long as detect output charge value, just can detect flexure electro dynamic effect.
Claims (6)
1. the flexure electro dynamic effect direct-detection device based on detection electric charge, it is characterized in that: comprise the upper double-sided metal electrode slice (1) and lower double-sided metal electrode slice (3) that are separately positioned on test specimen (2) upper surface and lower surface, the upper and lower surface of described upper double-sided metal electrode slice (1) is respectively arranged with metal electrode and lower metal electrode, and the lower metal electrode of upper double-sided metal electrode slice (1) contacts with the upper surface of test specimen (2); The upper and lower surface of described lower double-sided metal electrode slice (3) is respectively arranged with metal electrode and lower metal electrode, and the upper metal electrode of lower double-sided metal electrode slice (3) contacts with the lower surface of test specimen (2); The upper metal electrode of described upper double-sided metal electrode slice (1) is connected by ground wire (6) with the lower metal electrode of lower double-sided metal electrode slice (3); The upper metal electrode of described lower double-sided metal electrode slice (3) connects the lead-in wire (10) measuring charge signal, and the lead-in wire (10) of described measurement charge signal connects charge amplifier (11) and display memory storage (12) successively; The side of described test specimen (2) is connected with high frequency ultrasound probe (4) by couplant (5), and high frequency ultrasound probe (4) is connected with power amplifier (8) and high frequency pulse generator (9) successively by lead-in wire (7).
2. a kind of flexure electro dynamic effect direct-detection device based on detecting electric charge according to claim 1, is characterized in that: described upper double-sided metal electrode slice (1) and lower double-sided metal electrode slice (3) are pcb board.
3. a kind of flexure electro dynamic effect direct-detection device based on detecting electric charge according to claim 1, is characterized in that: described ground wire (6) is connected by the mode of wire bonding with the upper metal electrode of upper double-sided metal electrode slice (1) and the lower metal electrode of lower double-sided metal electrode slice (3).
4. a kind of flexure electro dynamic effect direct-detection device based on detecting electric charge according to claim 1, is characterized in that: the lead-in wire (10) of described measurement charge signal is connected by the mode of wire bonding with the upper metal electrode of lower double-sided metal electrode slice (3).
5. a kind of flexure electro dynamic effect direct-detection device based on detecting electric charge according to claim 1, is characterized in that: described display memory storage (12) is oscillograph.
6. the detection method of the pick-up unit described in any one of claim 1 to 5, it is characterized in that: high frequency pulse generator (9) produces electric signal, after being transferred to power amplifier (8) amplifying power by lead-in wire (7), excitation high frequency ultrasound probe 4) produce high-frequency ultrasonic, when high-frequency ultrasonic is by test specimen (2), be subjected to displacement and produce strain gradient, polarization charge is produced in test specimen (2) upper and lower surface again by flexoelectric effect, test specimen (2) lower surface electric charge passes in charge amplifier (11) by the upper metal electrode of lower double-sided metal electrode slice (3) via the lead-in wire (10) measuring charge signal, after being converted into magnitude of voltage, in display memory storage (12), display stores,
When high-frequency ultrasonic is by test specimen (2), ultrasound wave wavelength and lattice lengths close to time, vibration can produce the strain gradient of the time of depending on, and strain gradient can produce the polarization displacement of ion; For high-frequency ultrasonic, the acceleration of atom is proportional to strain gradient, and the acceleration of the ion of different quality produces extra polarization displacement, thus produces flexure electro dynamic effect, and produce polarization charge, its expression formula is:
U＝kQ
Wherein μ
d=-χ cM/ ρ is Dynamic flexural electrostrictive coefficient, and M is the coefficient calculated by lattice dynamics, and ρ is density, and c is elastic constant; μ is static flexoelectric coefficient, ε is the elastic strain of material, x is the direction of gradient, P is the polarization that the strain gradient caused by flexoelectric effect produces, Q is the upper metal electrode output charge of lower double-sided metal electrode slice (3), k is electric charges amplify coefficient, and U is the output quantity of magnitude of voltage, and H is the material test specimen lower surface length of side.Can be found out by formula, as long as detect output charge value, just can detect flexure electro dynamic effect.
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Cited By (5)
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| CN105403748A (en) * | 2015-12-12 | 2016-03-16 | 西安交通大学 | Measurement apparatus and method for generating pulse voltages on the basis of flexoelectric dynamic effect |
| CN105424978A (en) * | 2015-12-29 | 2016-03-23 | 西安交通大学 | High-g value acceleration sensor based on flexoelectric effects and measurement method |
| CN105486933A (en) * | 2015-12-29 | 2016-04-13 | 西安交通大学 | Device and method of measurement of reverse flexure electrical modulus through mosquito-repellent incense displacement amplification structure |
| CN110632161A (en) * | 2019-09-18 | 2019-12-31 | 西安交通大学 | Experimental measurement device and decoupling method for shear direction flexoelectric coefficient |
| CN111072381A (en) * | 2018-10-22 | 2020-04-28 | 中国科学技术大学 | Method for controlling dielectric material apparent flexoelectric effect |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403748A (en) * | 2015-12-12 | 2016-03-16 | 西安交通大学 | Measurement apparatus and method for generating pulse voltages on the basis of flexoelectric dynamic effect |
| CN105424978A (en) * | 2015-12-29 | 2016-03-23 | 西安交通大学 | High-g value acceleration sensor based on flexoelectric effects and measurement method |
| CN105486933A (en) * | 2015-12-29 | 2016-04-13 | 西安交通大学 | Device and method of measurement of reverse flexure electrical modulus through mosquito-repellent incense displacement amplification structure |
| CN105486933B (en) * | 2015-12-29 | 2018-03-16 | 西安交通大学 | Device and method by mosquito-repellent incense formula displacement equations structure measurement against flexoelectric coefficient |
| CN105424978B (en) * | 2015-12-29 | 2018-10-19 | 西安交通大学 | A kind of high shock acceleration sensor and measurement method based on flexoelectric effect |
| CN111072381A (en) * | 2018-10-22 | 2020-04-28 | 中国科学技术大学 | Method for controlling dielectric material apparent flexoelectric effect |
| CN110632161A (en) * | 2019-09-18 | 2019-12-31 | 西安交通大学 | Experimental measurement device and decoupling method for shear direction flexoelectric coefficient |
| CN110632161B (en) * | 2019-09-18 | 2020-09-22 | 西安交通大学 | Experimental measurement device and decoupling method for shear direction flexoelectric coefficient |
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