22 results about "Piezoelectric voltage" patented technology

A method includes receiving, by a piezoelectric stack of a transducer, a first piezoelectric voltage. The transducer has a base structure and a first layer, the base structure having a first displacement between a first portion of the base structure and the first layer. The method also includes transmitting, by the transducer, a first ultrasound frequency while receiving a first piezoelectric voltage, and receiving, by the transducer, a first bias voltage. The received first bias voltage alters the first displacement between the first portion of the base structure and the first layer, and the altered first displacement is smaller than the first displacement. The method further includes receiving, by the piezoelectric stack of the transducer, a second piezoelectric voltage to the transducer, and transmitting, by the transducer, a second ultrasound frequency while receiving the first bias voltage and the second piezoelectric voltage.

A method includes receiving, by a piezoelectric stack of a transducer, a first piezoelectric voltage. The transducer has a base structure and a first layer, the base structure having a first displacement between a first portion of the base structure and the first layer. The method also includes transmitting, by the transducer, a first ultrasound frequency while receiving a first piezoelectric voltage, and receiving, by the transducer, a first bias voltage. The received first bias voltage alters the first displacement between the first portion of the base structure and the first layer, and the altered first displacement is smaller than the first displacement. The method further includes receiving, by the piezoelectric stack of the transducer, a second piezoelectric voltage to the transducer, and transmitting, by the transducer, a second ultrasound frequency while receiving the first bias voltage and the second piezoelectric voltage.

The present invention discloses a piezoelectric pressure sensor based on an In2Se3 / InSe vertical heterojunction, and its preparation method and application, belonging to the technical field of sensor instrument construction. The present invention uses an In2Se3 / InSe vertical heterojunction thin film as a pressure-sensitive layer to prepare a piezoelectric pressure sensor. The stress change caused by the air pressure will change the energy band structure of the In2Se3 / InSe vertical heterojunction, thereby generating a piezoelectric voltage. This change can be monitored by detecting its voltage change through a charge amplifier, thereby achieving a highly sensitive response to tiny air pressure changes. The piezoelectric pressure sensor of the present invention is small in size and highly sensitive, providing a simple, sensitive and stable device and detection method for high-precision air pressure detection.

The utility model discloses an MEMS-based wavelength-adjustable light receiving assembly, which comprises a packaging shell, the top of the packaging shell is provided with an incident port, the incident port is provided with a lens, the packaging shell is internally provided with a packaging cavity, the packaging cavity is internally provided with a substrate, the substrate is provided with a total reflection sheet, an optical wedge and an MEMS micromirror, the total reflection sheet is located right below the lens, and the optical wedge is located right below the lens. The total reflection sheet is obliquely arranged, the optical wedge is located obliquely above the total reflection sheet, the inclination angle of the optical wedge is larger than that of the total reflection sheet, the MEMS micromirror is located obliquely above the optical wedge, the MEMS micromirror is used for reflecting light dispersed by the optical wedge downwards, and a photoelectric detector is arranged on the bottom surface of the packaging cavity. Through the relation between the piezoelectric voltage and the rotation angle, the required wavelength can be reflected to the photoelectric detector, and optical signals with different wavelengths can be received.

The invention discloses a porous barium titanate single crystal and a preparation method and application thereof, and belongs to the technical field of piezoelectric single crystal materials. The porous barium titanate single crystal provided by the invention has an ultrahigh piezoelectric voltage coefficient which can reach (50-55) * 10 <-3 > Vm / N, and has a better application prospect in electromechanical devices such as sensors, transducers and the like. The porous barium titanate single crystal is prepared by adopting a solid phase method, seed crystals are utilized to induce single crystal growth, and the method is simple in preparation process, low in cost and beneficial to large-scale production of the porous barium titanate single crystal.

The invention belongs to the technical field of special ceramic preparation, and particularly relates to lead zirconate titanate porous piezoelectric ceramic as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing an alkenyl-containing organic monomer, a cross-linking agent, an alcohol organic solvent, lead zirconate titanate powder and a dispersing agent, grinding, removing bubbles from the obtained premix, mixing with an initiator and an amine catalyst, and carrying out a polymerization reaction to obtain a gel blank; and sequentially drying and sintering the gel blank to obtain the lead zirconate titanate porous piezoelectric ceramic. The porosity of the lead zirconate titanate porous piezoelectric ceramic ranges from 45.40% to 64.87%, the piezoelectric voltage coefficient ranges from 43.95 * 10 <-3 > to 81.71 * 10 <-3 > Vm / N, the energy collection quality factor ranges from 9.95 * 10 <-12 > to 20.28 * 10 <-12 > m < 2 > / N, and the lead zirconate titanate porous piezoelectric ceramic has good application in high-sensitivity output and excellent energy collection materials.

The invention provides a signal acquisition and wireless transmission system based on a piezoelectric pressure-sensitive sensor. The signal acquisition and wireless transmission system comprises a piezoelectric signal acquisition circuit, a capacitance signal acquisition module, a low-power-consumption control module and a miniaturized integrated design, the piezoelectric signal acquisition circuit comprises a charge amplifier (OPA4340) and a band-pass filter (10Hz-1kHz); the capacitance signal acquisition unit comprises an ultrahigh-precision capacitance digital converter (PCAP01 chip) and a low-pass filter (0-10Hz); the low-power-consumption control module comprises an intermittent transmission protocol (adjustable data packing interval) of a Bluetooth module (nRF52840); the miniaturized integrated design comprises a flexible PCB (Printed Circuit Board) substrate and a module stacking layout; key elements (such as an ADC and a filter) are packaged by QFN (Quad Flat No-lead) so as to reduce the volume. Based on the technical scheme of the invention, the intelligent degree and the signal precision of the sensor circuit can be effectively improved, the power consumption and the parasitic capacitance interference are reduced, and the size is reduced.

The invention particularly relates to a random response analysis method for a piezoelectric-electromagnetic hybrid energy collector under pulsating wind excitation, and the method comprises the steps: building a mechanical vibration equation containing a galloping aerodynamic item and a time-delay feedback control item, and enabling the mechanical vibration equation to be combined with a piezoelectric voltage state equation and an electromagnetic current state equation to form an initial electromechanical coupling equation set; therefore, the mechanical end dynamics and the energy conversion effect of the two branches are simultaneously represented in the same model. Introducing the dimensionless fluctuating wind speed into galloping aerodynamic force and performing equivalent modeling by using multiplicative noise so as to explicitly map the fluctuating wind speed into a state-related random excitation item; voltage and current variables are equivalent to algebraic terms of displacement and speed by adopting harmonic transformation, and an equivalent decoupling system is obtained, so that model variable transformation is realized, and the analytical solution efficiency is improved; and finally, a steady-state probability density function is obtained based on energy envelope random averaging, and a random response analysis result is calculated according to the steady-state probability density function, so that a reliable basis is provided for evaluation of control parameters and energy harvesting performance.

The application relates to a breeding tail water treatment device and method based on piezoelectric strengthening, which comprises a water supply pump, a jet aerator, a biological aerated filter and an anaerobic tank. The application can improve the oxygen content of sewage and can induce piezoelectric air filter membranes to generate piezoelectric effect through flowing air, so as to obtain piezoelectric charge and voltage. The piezoelectric charge can react with oxygen and water to generate active oxygen species, so as to realize the conversion of air kinetic energy into electric energy and chemical energy. The piezoelectric voltage directly drives the anode and the cathode to work, and can enrich the functional bacteria of the biological treatment unit, improve the activity of functional microorganisms, and the active oxygen species can directly degrade organic pollutants, so as to synergistically enhance the performance of removing pollutants.

The invention discloses an in-vitro bone force-electrical property measuring device based on complex impedance and piezoelectric property measurement. The in-vitro bone force-electrical property measuring device comprises a workbench, an in-vitro bone clamping module, an axial pressure output module, a complex impedance measuring module and a main control module. The in-vitro bone clamping module is used for clamping an in-vitro bone; the axial pressure output module is used for applying axial pressure to the in-vitro bone clamped by the in-vitro bone clamping module, and a pressure sensor used for measuring the actual stress value of the in-vitro bone is arranged in the axial pressure output module; the complex impedance measurement module is used for collecting complex impedance data between any two points on the surface of the in-vitro bone under different axial pressures; the main control module is used for controlling the axial pressure output module to work and regulating and controlling the output pressure of the axial pressure output module according to the actual stress value fed back by the pressure sensor and the initial set value; and the main control module is also used for receiving the complex impedance data and calculating the piezoelectric voltage of the in-vitro bone according to the complex impedance data.

The invention relates to a calcium bismuth titanate piezoelectric ceramic with a high piezoelectric constant and a piezoelectric voltage constant and a preparation method of the calcium bismuth titanate piezoelectric ceramic. The chemical composition of the bismuth calcium titanate piezoelectric ceramic is Ca < 0.94 > Bi < 4.06 > Ti < 4 > O < 15-x > wt% MgO, x represents the mass percent of MgO in a Ca < 0.94 > Bi < 4.06 > Ti < 4 > O < 15 > matrix, and x is greater than 0 and less than or equal to 0.3. The Ca0. 94Bi4. 06Ti4O15 component with good piezoelectric property is taken as a matrix, and MgO with low dielectric constant is added, so that the dielectric constant of the calcium bismuth titanate-based high-temperature piezoelectric ceramic is regulated and controlled; meanwhile, a built-in electric field can be established when the free moving charges are polarized, so that the polarization intensity is enhanced, and the piezoelectric property is improved.

A porous, fine-grained piezoelectric energy harvesting ceramic and its preparation method are disclosed, belonging to the field of piezoelectric ceramic technology. The chemical composition of this piezoelectric ceramic is: Pb(Mg) 1 / 30 Ni 1 / 30 Nb 2 / 15 Zr 48 / 125 Ti 52 / 125 O3, its microstructure features include: different pore surface distribution densities (0 pores / mm²). 2 <Porous surface distribution density ≤12000 mm 2 By introducing low-dielectric-constant pores as a second phase into PZT-based ceramics with high voltage electrical properties, a ceramic with both high voltage electrical charge constant dp and high dielectric constant dp was designed and prepared. 33 and piezoelectric voltage constant g 33 Porous fine-grained PZT-based piezoelectric energy harvesting ceramics.

The application discloses a high-performance relaxor ferroelectric single crystal and a preparation method and application thereof, and belongs to the technical field of piezoelectric materials. Based on a TSSG method, through the synergistic effect of a bottom oxygen feeding technology and component regulation, a technical problem that a piezoelectric charge coefficient d 33 and a piezoelectric voltage coefficient g 33 are difficult to be considered simultaneously in the existing relaxor ferroelectric single crystal is successfully solved. The bottom oxygen feeding technology effectively inhibits Pb element volatilization and compensates oxygen vacancies, greatly reduces the defect density and the content of impurities in the crystal, and eliminates the pinning effect of defect dipoles on domain switching. In combination with accurate construction of a morphotropic phase boundary, the single crystal can fully release the polarization deflection advantage caused by the coexistence of multiple phases. The prepared PYN-PMN-PT relaxor ferroelectric single crystal realizes the coexistence of high piezoelectric response and excellent piezoelectric voltage coefficient, and significantly improves the quality factor of the material.

The invention discloses ultrasonic transducer pre-tightening force intelligent assembling equipment and method based on piezoelectric feedback, belongs to the technical field of intelligent manufacturing, and constructs a direct feedback closed-loop control system with a piezoelectric ceramic crystal pile as a force sensing element. A multi-stage self-adaptive control strategy is adopted, idle stroke feeding is sequentially executed to quickly eliminate the assembly clearance, an electrical seating point is accurately judged to serve as a loading starting point by synchronously monitoring piezoelectric voltage and real-time torque, then linear loading is conducted, the torque rate is calculated in real time to monitor the process state, when the piezoelectric voltage is close to a target value, low-speed micro-feeding is conducted, and when the torque rate is close to the target value, low-speed micro-feeding is conducted. And finally, the hardware comparator triggers hardware interruption at the moment that the voltage reaches a preset threshold value, and the control unit is driven to realize millisecond-level sudden stop, so that overshoot is completely eradicated fundamentally. The technical transition from indirect torque control to direct force feedback control is achieved, the pre-tightening force control precision is improved, meanwhile, the consistency and reliability of high-end ultrasonic transducer products are guaranteed, and the production efficiency is greatly improved.

A wireless passive marker device (1) to be tracked and a respective tracking system (3) are provided which make use of a sensing unit (10) comprising a resonator element (11) with piezoelectric properties and a coil element (13), whereby an externally applied excitation field having a particular frequency is applied to act on the sensing unit (10) and wherein the sensing unit (10) responds to the externally applied excitation field by the resonator element (11) performing persisting mechanical oscillations in resonant mode, the persisting mechanical oscillations resulting in a piezoelectric voltage causing the coil element (13) to generate a magnetic field that may then be detected by the tracking system (3) and used for determining the position of the marker device (1) and / or sensing a physical property in the surrounding environment of the marker device (1).

A wireless passive marker device (1) to be tracked and a respective tracking system (3) are provided which make use of a sensing unit (10) comprising a resonator element (11) with piezoelectric properties and a coil element (13), whereby an externally applied excitation field having a particular frequency is applied to act on the sensing unit (10) and wherein the sensing unit (10) responds to the externally applied excitation field by the resonator element (11) performing persisting mechanical oscillations in resonant mode, the persisting mechanical oscillations resulting in a piezoelectric voltage causing the coil element (13) to generate a magnetic field that may then be detected by the tracking system (3) and used for determining the position of the marker device (1) and / or sensing a physical property in the surrounding environment of the marker device (1).

The invention discloses a lead-free textured piezoelectric ceramic with high electromechanical transduction and high Curie temperature as well as a preparation method and application thereof, and relates to a lead-free textured piezoelectric ceramic as well as a preparation method and application thereof. The problems that in the prior art, improvement of the electromechanical transduction coefficient is limited, and the material use temperature zone is narrowed are solved. The chemical formula is (KxNa1-x-yAy) (Nb1-zBz) O3-w vol.% M + u mol% N, the piezoelectric coefficient is 350 pC / N or more, the piezoelectric voltage coefficient is 70 * 10 <-3 > Vm / N or more, the electromechanical transduction coefficient is 25 * 10 <-12 > m < 2 > / N or more, the orthogonal-tetragonal phase transition temperature is 85 DEG C or more, and the Curie temperature is 370 DEG C or more. The method comprises the following steps: 1, weighing; 2, preparing matrix powder; 3, preparation of tape casting slurry; and 4, preparing the textured ceramic. The piezoelectric material is applied to high-performance, wide-temperature-range and environment-friendly piezoelectric devices.

Embodiments of the present application provide a wafer position adjustment method and device, electronic equipment and storage medium, and belong to the field of semiconductor manufacturing. The method comprises: obtaining a first rotation angle parameter of a wafer; calculating a rotation pulse of a worm gear mechanism according to a first relationship function and a first rotation angle sine value; driving the worm gear mechanism to perform first position adjustment on the wafer according to the rotation pulse; obtaining a second rotation angle parameter of the wafer after the first position adjustment; calculating a piezoelectric voltage of a piezoelectric driving mechanism according to a second relationship function and a second rotation angle sine value and a target rotation angle cosine value; and driving the piezoelectric driving mechanism to perform second position adjustment on the wafer according to the piezoelectric voltage, which can improve the wafer alignment accuracy.

The present invention discloses a vibration signal extraction method for piezoelectric self-sensing energy capture, which utilizes a single piezoelectric device to capture vibration energy and sense vibration signals. The single piezoelectric device performs vibration energy capture and vibration signal sensing in parallel in a time-space sharing mode. A vibration acceleration calculation model suitable for the time-space sharing mode of piezoelectric self-sensing energy capture is established. When performing vibration signal sensing, the vibration signal is first collected and processed to obtain the angular frequency ω of the vibration acceleration and the voltage value V of the peak voltage divider signal. peak , then the angular frequency ω of the vibration acceleration and the voltage value V of the peak voltage divider signal peak The vibration acceleration amplitude can be calculated by substituting it into the vibration acceleration calculation model; the advantages are high immediacy and efficiency, which can meet the needs of continuous vibration sensing while eliminating the influence of high-order harmonic components in non-sinusoidal piezoelectric voltage signals. It has high vibration acceleration calculation accuracy and can meet the needs of high-precision vibration sensing.

The invention relates to a porous lead-free piezoelectric material, a preparation method thereof and a piezoelectric energy collector, and relates to the field of lead-free piezoelectric materials. The preparation method of the porous lead-free piezoelectric material comprises the following steps: preparing a ceramic substrate into a first piezoelectric film; preparing a second piezoelectric film from the ceramic matrix and a pore forming agent; a plurality of first piezoelectric films and a plurality of second piezoelectric films are stacked according to the sequence of the first piezoelectric films, the second piezoelectric films and the first piezoelectric films, and a multi-layer ceramic body is obtained. Compared with the prior art, the preparation method has the advantages that the addition amount of the pore-forming agent in the prepared porous ceramic layer and the thickness ratio are limited to be simultaneously within a specific range, so that the coupling relationship between the piezoelectric constant and the dielectric constant is effectively broken, and the piezoelectric voltage constant and the energy acquisition quality factor of the lead-free piezoelectric material are synergistically improved; therefore, the use requirements in the fields of piezoelectric energy collectors and the like are met, and the application prospect is wide.