65 results about "Piezodorus" patented technology

The present invention relates to the technical field of measuring electrical variables, and in particular to a multi-dimensional force measurement device that takes into account both static and dynamic measurements. This device solves the technical problems of traditional six-dimensional force sensors, such as complex and cumbersome structures, overall weight, inability to take into account both static and dynamic measurements, and low measurement accuracy. The device comprises a measurement component and a vibration isolation component; the measurement component comprises a base plate, a top plate, and a cantilever beam; the cantilever beam is connected to the base plate, and the cantilever beam is inserted into a limit groove of the top plate through a support arm. The cantilever beam is provided with a uniaxial strain gauge, a first biaxial strain gauge, a second biaxial strain gauge, an X-type piezoelectric crystal, a first Y-type piezoelectric crystal, and a second Y-type piezoelectric crystal; the vibration isolation component comprises a first horizontal support plate, a second horizontal support plate, a multi-layer isolation sleeve, and a support column, and the adjacent isolation sleeve interlayers are filled with elastic material. The device realizes the combination of static and dynamic measurements, and can capture rapidly changing torques and forces while maintaining high accuracy.

Systems and methods for measuring wall thicknesses include an ultrasonic transducer including a cylindrical housing defining a sensing plane at an end of the cylindrical housing; and a plurality of piezoelectric crystals disposed in the cylindrical housing in a circular configuration with a face of each piezoelectric crystal coincident with the sensing plane, each piezoelectric crystal being operable to transmit and receive ultrasonic waves.

The invention discloses a sensing unit structure of a piezoelectric-piezoresistive coupling type electric field sensor and application, the sensing unit structure comprises a substrate, the substrate is provided with a cantilever beam structure, a piezoelectric crystal block is bonded between the lower surface of the cantilever beam structure and the upper surface of the substrate, and the upper surface of the cantilever beam structure is provided with a Wheatstone full-bridge structure; when the piezoelectric crystal block is subjected to the action of an electric field, the piezoelectric crystal block deforms in the Z-axis direction under the action of an inverse piezoelectric effect, so that the cantilever beam structure deforms; in the Wheatstone full-bridge structure, the resistors arranged at the position with the maximum stress difference value are stressed to deform, the stress directions of the resistors are opposite, and the resistance values of the resistors are changed oppositely; compared with the sensing unit structures of electro-optical and mechanical electric field sensors commonly used at present, the sensing unit structure has the advantages of larger measuring range, smaller volume, lower power consumption and easiness in mass production.

The invention discloses a surface acoustic wave hydrogen sensor based on a platinum and graphene composite film and a manufacturing method thereof, and belongs to the technical field of gas sensors, the surface acoustic wave hydrogen sensor comprises a piezo-electric crystal, the piezo-electric crystal is oppositely provided with a first interdigital transducer and a second interdigital transducer, a graphene film is deposited on the piezoelectric crystal and located on a sound propagation path between the first interdigital transducer and the second interdigital transducer, a platinum catalyst layer film is deposited on the surface of the graphene film, and the first interdigital transducer and the second interdigital transducer are connected with an external circuit through metal pins. The external circuit comprises a signal generator, a frequency meter and a data acquisition system, the signal generator generates an excitation signal and transmits the excitation signal to the first interdigital transducer through the metal pin, and a detection signal generated by the interdigital transducers is received by the data acquisition system and then is detected and compared through the frequency meter. The problems that an existing pure graphene hydrogen sensor is low in sensitivity, poor in selectivity and slow in response time can be solved.

This invention provides a glass-based heterogeneous integrated structure with back vias and its fabrication method. Back vias are designed on a heterogeneous integrated wafer. The heterogeneous integrated wafer includes a glass substrate and a piezoelectric crystal layer, or at least one heterogeneous thin film layer is bonded between the glass substrate and the piezoelectric crystal layer. The back vias are blind vias and / or through-holes, with the blind vias etched to reach the piezoelectric crystal layer or any heterogeneous thin film layer. Filler metal is sputtered into the back vias. Before etching the front piezoelectric crystal layer, a surface acoustic wave (SAW) filter pattern can be fabricated on the complete surface of the glass-based heterogeneous integrated wafer with back vias. After etching the piezoelectric crystal layer, the bottom of the filler metal is exposed on the surface of the glass-based heterogeneous integrated wafer. The SAW filter and the filler metal are then interconnected through photolithography, evaporation or sputtering, electroplating, etc. The blind vias can be arranged into a folded inductor, connected to the front device layer through the through-holes. This invention features better device heat dissipation, improved package design and mass production capabilities, higher integration density, and higher device Q-value.

The present invention proposes an isotropic material plate impact positioning method based on a wavenumber domain response function, which belongs to the field of aircraft technology and solves the problems of low positioning accuracy and robustness of existing impact positioning methods. The steps include: calculating the dispersion curve of the guided wave according to the material properties and geometric dimensions of the detected part; selecting a preset frequency range, constructing a wavenumber-angle relationship function, and combining it with the frequency curve to obtain a frequency-angle function; constructing a wavenumber domain response function, and performing Fourier transform on the wavenumber domain response function to obtain a spatial domain response distribution function; mapping the pattern presented by the spatial domain response distribution function into an electrode of a piezoelectric crystal to obtain a directional sensor with a frequency component filtered according to direction; rigidly connecting several directional sensors to the detected part, outputting the 1dB bandwidth of the response signal, and constructing a fan-shaped area for each directional sensor, and using the intersection area of ​​all fan-shaped areas as the positioning result of the impact point.

The invention discloses a surface acoustic wave device and a radio frequency front end module, the surface acoustic wave device comprises a piezoelectric layer, a sound velocity layer and an interdigital electrode, and the interdigital electrode comprises a plurality of electrode fingers. The piezoelectric layer is provided with a first surface and a second surface which are oppositely arranged, the interdigital electrode is arranged on the first surface of the piezoelectric layer, and the sound velocity layer is arranged on the second surface of the piezoelectric layer; sound waves generated when the surface acoustic wave device works comprise surface acoustic waves and body waves; the surface acoustic wave device has a first characteristic depth, and the thickness of the piezoelectric layer is smaller than the first characteristic depth; wherein the first characteristic depth is related to the midline distance between two adjacent electrode fingers of the interdigital electrode, the bulk wave sound velocity of the piezoelectric crystal in the x direction and the working frequency. The sound velocity layer is directly arranged below the piezoelectric layer, the thickness of the piezoelectric layer is limited to be smaller than the first characteristic depth, and the thickness of the piezoelectric layer is reasonably reduced, so that the sound velocity of the surface wave is obviously improved or reduced, and meanwhile, the influence on the effects of other functional layers is avoided.

The invention discloses a surface acoustic wave-based road icing sensor, which comprises a surface acoustic wave icing sensing chip and a signal processing system, and is characterized in that the surface acoustic wave icing sensing chip comprises a piezoelectric crystal, and an input transducer, an output transducer and a waveguide layer which are deposited on the piezoelectric crystal; the signal processing system comprises a signal source, a phase-locked loop and a splitter which are connected in sequence, and further comprises an amplitude discriminator and an A / D converter, and the splitter outputs two paths of signals which are directly connected to the amplitude discriminator respectively and are connected to the amplitude discriminator after passing through the surface acoustic wave icing sensing chip; the amplitude discriminator outputs a comparison result of the two paths of signals to the A / D converter so as to obtain road icing information; real-time monitoring of icing and the thickness of an ice layer is realized by utilizing the acoustic mode change of the surface acoustic waves caused by icing and the mass load effect, so that the road icing sensor disclosed by the invention has the technical effects of low power consumption, fast response and strong anti-interference capability.

The disclosed method of diffusion bonding of a lead zirconate titanate piezoelectric crystal to a metal wear plate, for the fabrication of an ultrasonic transducer operable at high temperatures and able to withstand repeated thermal cycling, comprises depositing noble metal coatings on both bonding surfaces, bringing the surfaces into contact, and heating under pressure at a temperature ranging from 270 to 400° C.

A sensitive unit structure of a piezoelectric-piezoresistive coupled electric field sensor and application, comprising a substrate, a cantilever beam structure is arranged on the substrate, a piezoelectric crystal block is bonded between the lower surface of the cantilever beam structure and the upper surface of the substrate, and a Wheatstone full-bridge structure is arranged on the upper surface of the cantilever beam structure; when the piezoelectric crystal block is subjected to the action of an electric field, the piezoelectric crystal block generates deformation along the Z-axis direction under the action of the inverse piezoelectric effect, so that the cantilever beam structure is deformed; in the Wheatstone full-bridge structure, the resistors arranged at the positions with the maximum stress difference generate deformation under stress, the stress directions of the resistors are opposite, and the resistance value changes are opposite; compared with the commonly used electric field sensor sensitive unit structures such as the electro-optic type and the mechanical type, the present application has the advantages of a larger range, a smaller size, lower power consumption and easy mass production.

The invention relates to a locking type steel wire thread insert vibration test clamp device and a vibration test method, which are suitable for vibration examination of a locking type steel wire thread insert in a free state in an aero-engine. The device comprises a clamp base body, a bolt connecting hole, an O-shaped groove and an induction block. The clamp base body is rigidly connected with the electromagnetic vibration table through a bolt, the O-shaped groove is used for installing a steel wire thread insert test piece, the induction block is made of piezoelectric crystal materials, and when the steel wire thread insert vibrates to reach the set amplitude, the induction block is contacted to generate induction current to drive the induction lamp or the ampere meter to display. The test method comprises seven steps of system connection and preparation, parameter setting and starting, vibration amplitude monitoring, amplitude adjustment, assessment state confirmation, vibration assessment execution and test ending. Through a closed-loop control system formed by an external source signal generator and a laser displacement sensor, single-degree-of-freedom fixed-amplitude vibration in a non-resonance state is realized, the amplitude control is accurate, overload is avoided, parallel testing of multiple test pieces is supported, the test efficiency is improved, the method is closer to actual working conditions, and the method has higher engineering application value.

The invention relates to the technical field of medical equipment, and relates to an output control method and system of a piezoelectric shock wave therapeutic apparatus, and the method comprises the steps: responding to the shock wave therapeutic apparatus to output mechanical waves to a focus area of a patient, and collecting an infrared thermogram of the focus area of the patient; obtaining the maximum value of the gray values of all the pixel points in the infrared thermal image, and obtaining the ratio of the number of the pixel points of which the gray values are greater than a preset threshold value in the infrared thermal image to the number of all the pixel points in the infrared thermal image; calculating a risk scoring coefficient at the current moment; and according to the risk scoring coefficient at the current moment, correcting an input voltage of a piezoelectric crystal in the piezoelectric shock wave therapeutic apparatus at the previous moment so as to determine an input voltage of the piezoelectric crystal at the current moment.

The invention relates to the technical field of oil and gas field development, and discloses a linkage type intelligent opening system for intelligent fracturing sliding bushings and a control method thereof.The system comprises the multiple intelligent fracturing sliding bushings internally provided with multi-dimensional coding response units; the multi-dimensional coding response unit comprises a micro piezoelectric resonator array, the micro piezoelectric resonator array is composed of a plurality of piezoelectric crystals with inherent acoustic resonant frequencies, and acoustic fingerprint codes of the intelligent fracturing sliding sleeve are formed by the set combination of the inherent acoustic resonant frequencies of the piezoelectric crystals; and the micro magnetostriction exciter has the optimal response frequency sensitive to the alternating magnetic field with the set frequency, and the optimal response frequency forms a magnetic field response code of the intelligent fracturing sliding sleeve. By compounding the acoustic fingerprint codes and the magnetic field response codes, opening of the intelligent fracturing sliding sleeve does not respond to interference of a single underground field source, such as sound waves or magnetic field fluctuation without specific codes, so that the unexpected opening probability is reduced, and the specificity of target selection is improved.

This utility model relates to a piezoelectric vibration sensor with an adjustable counterweight position, belonging to the technical field of piezoelectric vibration sensors. The piezoelectric vibration sensor with an adjustable counterweight position includes: a housing, a base at the bottom of the housing, and a mounting component mounted on the base. The adjustment mechanism includes a driving block disposed inside the housing, a mass block disposed inside the driving block, and a threaded rod for adjusting the position of the driving block disposed inside the housing. By setting the adjustment mechanism, the position of the counterweight can be adjusted inside the housing, allowing the sensor to be optimized according to different vibration frequencies, improving its sensitivity and detection accuracy. By adjusting the position of the counterweight, it can be ensured to better cooperate with the piezoelectric crystal, thereby increasing the output charge of the sensor. This improvement allows the sensor to maintain relatively accurate measurement results under different vibration environments.

The present application is directed to systems and processes for generating electrical power from piezoelectric elements. One exemplary implementation is a system that includes a rotor, a piston, multiple holders, and a plurality of piezoelectric elements. The holders are disposed in a consecutive arrangement that extends radially away from an outer circumferential surface of the rotor, and each holder has one or more openings defined therethrough. The piezoelectric elements housed in each holder are disposed in respective openings of the corresponding holder. The piezoelectric elements corresponding to an innermost one of the holders is mechanically coupled to the outer circumferential surface of the rotor via the piston. And, an electrical contact is disposed between each pair of adjacent holders such that the piezoelectric crystals corresponding to each holder are connected in a parallel circuit.

The application discloses a surface acoustic wave device and a radio frequency front-end module. The surface acoustic wave device comprises a piezoelectric layer, a sound velocity layer and an interdigital electrode, wherein the interdigital electrode comprises a plurality of electrode fingers. The piezoelectric layer has a first surface and a second surface arranged oppositely, the interdigital electrode is arranged on the first surface of the piezoelectric layer, and the sound velocity layer is arranged on the second surface of the piezoelectric layer. The sound wave of the surface acoustic wave device in operation comprises a surface acoustic wave and a bulk wave. The surface acoustic wave device has a first characteristic depth, and the thickness of the piezoelectric layer is less than the first characteristic depth. The first characteristic depth is related to the center line spacing of two adjacent electrode fingers of the interdigital electrode, the bulk wave sound velocity of the piezoelectric crystal along the x direction and the working frequency. By arranging the sound velocity layer directly below the piezoelectric layer and limiting the thickness of the piezoelectric layer to be less than the first characteristic depth, the thickness of the piezoelectric layer is reasonably thinned, the surface wave sound velocity is obviously improved or decreased, and the influence on other functional layers is avoided.

The present application relates to a surface acoustic wave device, a radio-frequency front-end module, and an electronic device. The surface acoustic wave device comprises a piezoelectric layer, and an interdigital electrode, which is provided on a first surface of the piezoelectric layer. The interdigital electrode comprises a plurality of electrode fingers. During the operation of the surface acoustic wave device, acoustic waves comprise surface acoustic waves and bulk acoustic waves, wherein the propagation direction of the surface acoustic waves is an X direction. A first characteristic thickness of the surface acoustic wave device is Ty, and the thickness of the piezoelectric layer is Dy, and the thickness of the piezoelectric layer and the first characteristic thickness meet the following conditions [equation I], wherein the piezoelectric layer comprises a piezoelectric crystal, and the value of the first characteristic thickness is determined on the basis of the centerline spacing between two adjacent electrode fingers, the bulk acoustic wave velocity of the piezoelectric crystal in the X direction, and an operating frequency. The thickness of the piezoelectric layer is defined by means of a first characteristic thickness, thereby preventing the acoustic functions of other structures from being affected by the excessive thickness of the piezoelectric layer, and thus improving the operation performance of the surface acoustic wave device.

The invention discloses a piezoelectric crystal grinding control system based on a frequency testing technology. Comprising the steps that a hardware collection module collects original resonance frequency signals, vibration intensity and grinding head working parameters; the frequency test compensation module performs separation compensation on vibration interference and outputs accurate resonant frequency and change rate thereof; a dynamic mapping model is arranged in the dynamic mapping control module, the accurate resonance frequency, the change rate and the vibration intensity serve as input, the rotating speed, the pressure and the feeding amount of a grinding head are output, dynamic correction and advanced pre-judgment are conducted on the output through a vibration working condition correction unit and a frequency drift advanced pre-judgment unit, and a grinding parameter instruction is generated; the execution driving module drives the grinding head to adjust working parameters according to the instruction; and the closed-loop self-calibration module corrects the compensation coefficient and the model weight according to the actual frequency convergence effect. The full-link closed-loop precise control of the grinding process is realized, the vibration interference is effectively inhibited, and the frequency test precision and the processing consistency are improved.

The present application relates to the technical field of piezoelectric crystal, and particularly relates to a roughening processing method for the back surface of an ultrathin lithium tantalate wafer, which comprises the following steps: a) protecting the front surface of the lithium tantalate wafer by pasting a film; b) heating and sandblasting abrasive, and baking the sandblasting abrasive; c) starting the rotation of a sandblasting platform, adjusting the distance between the sandblasting gun and the lithium tantalate wafer, adjusting the sandblasting pressure to 0.2-0.3 Mpa, and performing first roughening processing on the back surface of the wafer; d) after the first roughening processing is completed, removing the sandblasting particle residues attached to the surface of the wafer, readjusting the sandblasting pressure to 0.1-0.15 Mpa, and performing second roughening processing on the back surface of the wafer; e) after the second roughening processing is completed, immersing the wafer in a mixed solution tank of hydrofluoric acid and nitric acid, then immersing the wafer in a warm water tank for ultrasonic cleaning, then immersing the wafer in a normal temperature tank for ultrasonic cleaning, and finally immersing the wafer in an overflow tank to complete wafer cleaning.

The invention relates to a surface acoustic wave device, a radio frequency front-end module and electronic equipment. The surface acoustic wave device comprises a piezoelectric layer and an interdigital electrode arranged on the first surface of the piezoelectric layer, wherein the interdigital electrode comprises a plurality of electrode fingers; when the surface acoustic wave device works, acoustic waves comprise surface acoustic waves and bulk waves, and the propagation direction of the surface acoustic waves is the X direction; the first characteristic thickness of the surface acoustic wave device is the thickness of the piezoelectric layer, and the thickness of the piezoelectric layer and the first characteristic thickness meet the condition; wherein the piezoelectric layer comprises a piezoelectric crystal, and the size of the first characteristic thickness is determined according to the midline distance between two adjacent electrode fingers, the bulk wave sound velocity of the piezoelectric crystal in the X direction and the working frequency of the piezoelectric crystal. The thickness of the piezoelectric layer is limited through the first characteristic thickness, so that the influence on the acoustic function of other structures due to the too thick piezoelectric layer is avoided, and the working performance of the surface acoustic wave device is improved.

The present application is directed to systems and processes for generating electrical power from piezoelectric elements. One exemplary implementation is a system that includes a rotor, a piston, multiple holders, and a plurality of piezoelectric elements. The holders are disposed in a consecutive arrangement that extends radially away from an outer circumferential surface of the rotor, and each holder has one or more openings defined therethrough. The piezoelectric elements housed in each holder are disposed in respective openings of the corresponding holder. The piezoelectric elements corresponding to an innermost one of the holders is mechanically coupled to the outer circumferential surface of the rotor via the piston. And, an electrical contact is disposed between each pair of adjacent holders such that the piezoelectric crystals corresponding to each holder are connected in a parallel circuit.

The application discloses a kind of based on sealing self-checking stop valve, it is related to stop valve technical field.The application utilizes the displacement when lower valve flap closes, automatically opens sealing test groove, and the leakage liquid is guided and collected, is driven detection ring by leakage liquid and moves upwards, to drive detection block extrusion transmission block, finally triggers piezoelectric crystal, converts leakage physical quantity into quantifiable electric signal, realizes the purpose of sealing self-checking.Utilize the design that valve flap assembly opens, lower valve flap automatically rebounds, drives drainage ring and sealing test groove inlay, extrudes the leakage liquid in sealing test groove, reaches the effect of drainage.Utilize the pressure when valve flap assembly closes, make lower valve flap and upper valve flap close, extrude airbag ring, airbag ring generates one-way expansion and carries out secondary sealing to intercepting port, in combination with the primary seal between upper valve flap and lower valve flap and intercepting port, realize the effect of multiple sealing to intercepting port.

The invention relates to the technical field of photoelectric nacelles, and discloses a manufacturing method of a three-axis gyroscope and a temperature drift and orthogonality calibration method of the three-axis gyroscope. Independently welding and cleaning the side plates; tooling three-dimensional assembling and welding are carried out; welding of pin headers between the side plates and the bottom plate is completed in the welding tool; electrical verification and final cleaning are carried out after assembling; according to the temperature drift calibration method, zero offset compensation and orthogonality calibration are realized through synchronous temperature cycle excitation and automatic modeling, a high-precision three-axis turntable is utilized, a specific axis is locked and excited step by step, and a non-orthogonal installation error among the three axes is accurately solved and compensated by combining reference data of the turntable. The high-risk welding procedure is decomposed, the welding tool with the local thermal protection function is adopted, thermal shock of a welding heat source to the sensitive piezoelectric crystal is isolated, welding spot bridging short circuit is effectively prevented, and the contradiction of the photoelectric pod in precision, reliability and batch production efficiency is solved through cooperation of manufacturing, temperature drift and orthogonality calibration.

An aerosol generator (100) has a vibratable plate (1) with apertures therein and an annular piezo (2) which causes movement of the vibratable plate (1). An annular support member (3) supports the piezo (2) and the vibratable plate (1). A first electrical power conducting pin (10) engages directly with a first, top, surface of the piezo (2). A second electrical power conducting pin (11) indirectly conducts electrical power to a second surface of the piezo (2), by contacting an extension tab (103) of the support member (20), also on its top side. There is a film of cured epoxy adhesive on the tab (103), providing excellent gripping force between the pin (11) and the support (3). The aerosol generator (100) avoids need for soldered joints for electrical contact, and the pins are conveniently mounted parallel to each on the on the same lateral and top side of the piezo and support member. The pins may have multipoint tips (50) for particularly effective electrical contact.

The application discloses a high-impedance near-zero temperature drift high-temperature piezoelectric crystal material and a growth method and application thereof, and belongs to the technical field of piezoelectric crystal growth. x Gd 1‑x Ca4O(BO3)3, x=0.1-0.3, and the high-impedance near-zero temperature drift high-temperature piezoelectric crystal material can be obtained by using a conventional Czochralski method to grow a large-size high-quality single crystal, and the growth process is simple and easy to process. The piezoelectric special-shaped element made of the crystal material has an effective longitudinal piezoelectric constant d 33 The effective shear piezoelectric constant d 26 The high-temperature 1000 DEG C resistivity can reach 10 6 Ω.cm; the piezoelectric constant change rate in the range from room temperature to 1000 DEG C is below 5%, and the crystal material has the near-zero temperature drift characteristic and high-temperature resistance.

The utility model discloses a speed sensor which comprises a connector, a circuit board, a pre-tightening nut, a mass block, a piezoelectric ceramic crystal, a shell and a base. The bottom of the shell is connected with the base, and the top of the shell is hermetically connected with the connector; a stud is arranged at the center in the cavity of the shell, and a piezoelectric ceramic crystal is mounted on the stud; a mass block is pressed on the piezoelectric ceramic crystal; the piezoelectric ceramic crystal and the mass block are connected through the pre-tightening nut and the stud; a circuit board is mounted at the upper end in the cavity of the shell; the circuit board is connected with the piezoelectric ceramic crystal through a first wire. The circuit board is connected with the connector through a second wire. Epoxy resin glue is filled in a spare position in the shell. The shell and the base are tightly matched, so that the high efficiency of vibration transmission is ensured; the high-temperature-resistant ceramic piezoelectric crystal is combined, so that good frequency characteristic and high sensitivity are realized; the shell is in sealed connection with the connector, and the cavity is filled with epoxy resin glue, so that the reliability, waterproof performance and dustproof performance of the sensor are enhanced.

The utility model relates to the technical field of medical instruments, and discloses an ultrasonic probe. The ultrasonic probe comprises a probe handle, an installation carrier, a circuit assembly, a piezoelectric crystal assembly and a wire, the probe handle and the installation carrier are matched in an inserted mode to form a containing cavity, at least part of the circuit assembly is arranged in the containing cavity, and a positioning sinking groove is formed in the end, away from the probe handle, of the installation carrier and communicated with the containing cavity. The piezoelectric crystal assembly is limited in the positioning sinking groove and electrically connected with the circuit assembly through a wire, and the probe handle and the installation carrier are formed in a 3D printing mode. The ultrasonic probe disclosed by the utility model is convenient to process and low in manufacturing cost on the premise of ensuring the mounting precision of the piezoelectric crystal assembly.

The invention relates to the technical field of food processing machinery, and discloses an unfreezing and draining device for quick-frozen food production, which comprises an unfreezing box, and a compound function bed surface, a feeding mechanism and a pumping and draining mechanism which are arranged in the box. The composite function bed surface sequentially comprises a ceramic substrate corresponding to the thermoelectric refrigeration module array and used for unfreezing quick-frozen food; the hydrophobic insulating plate corresponds to the microelectrode array and is used for polymerizing the unfrozen water film into isolated water drops through an electrowetting effect; and the piezoelectric crystal substrate corresponds to the interdigital transducer and is used for atomizing and draining water drops through surface acoustic waves. By arranging the microelectrode array and the interdigital transducer, the efficient and high-quality surface draining effect is achieved; the physical damage to the quick-frozen food is effectively avoided, and the appearance integrity of the product is ensured; and through a set of energy recovery circulating mechanism, echelon utilization of energy is realized, and the total operation energy consumption of the equipment is reduced.

The present application is directed to systems and processes for generating electrical power from piezoelectric elements. One exemplary implementation is a system that includes a rotor, a piston, multiple holders, and a plurality of piezoelectric elements. The holders are disposed in a consecutive arrangement that extends radially away from an outer circumferential surface of the rotor, and each holder has one or more openings defined therethrough. The piezoelectric elements housed in each holder are disposed in respective openings of the corresponding holder. The piezoelectric elements corresponding to an innermost one of the holders is mechanically coupled to the outer circumferential surface of the rotor via the piston. And, an electrical contact is disposed between each pair of adjacent holders such that the piezoelectric crystals corresponding to each holder are connected in a parallel circuit.