55 results about "Piezoelectric transduction" patented technology

This invention relates to the field of ultra-precision polishing technology, specifically to an ultrasonic cavitation microjet polishing module for polishing microstructures. The module includes an acoustic focusing nozzle, a center-penetrating piezoelectric transducer, an adaptive acoustic impedance frequency tracking system, and a liquid supply and bubble nucleation system. The acoustic focusing nozzle employs a variable cross-section acoustic amplitude rod structure, ensuring that the standing wave antinodes and nozzle outlet are confocal, thus increasing energy density. The piezoelectric transducer has a ring structure with fluid flowing through its center, achieving efficient energy conversion. The frequency tracking system adjusts the excitation frequency in real time to maintain resonance. The liquid supply system introduces cavitation nuclei through a venturi tube, reducing the cavitation threshold. This invention, through an acoustic-fluid coupling mechanism, utilizes the dual effects of macroscopic kinetic energy removal and microscopic cavitation removal to solve the problems of traditional polishing techniques, such as difficulty in processing high aspect ratio microstructures, incomplete bottom polishing, and low efficiency. It achieves high-precision polishing of microstructure surfaces, and is particularly suitable for ultra-precision machining of deep and narrow grooves.

The application provides a static pressure balance type underwater self-driven flexible touch pressure sensing finger, which comprises a touch pressure sensing unit, a hydraulic cylinder, a pressure transmission unit, a piezoelectric transducing unit, a transducing unit support, a platinum electrode and a base, the touch pressure sensing unit and the pressure transmission unit are connected with the hydraulic cylinder through bolts, and the oil cavity between the piston end faces is filled with hydraulic oil; the piezoelectric transducing unit is inserted into the stepped through hole in the cylinder wall of the transducing unit support; the pressure transmission unit and the base are connected with the transducing unit support through a flange and a threaded pair; the platinum electrode is fixed in the lead hole of the piezoelectric transducing unit, and the lead of the platinum electrode is led out from the lead hole of the base and connected to a pressure detection circuit. Based on the area effect of Pascal's principle and the solid-liquid interface double electric layer principle, the application can convert the tiny pressure detected by the finger tip into a larger elastic deformation of the flexible hose, so as to generate a high-amplitude ionic current signal and transmit it to the pressure detection circuit, and realize the sensing, amplification and measurement of the pressure signal.

This invention discloses a wearable ultrasound delivery device for treating otitis media, comprising a wearable main body with a flexible structure adapted to the shape of the patient's ear canal, and a through-hole central channel; an ultrasound drug delivery device, detachably disposed within the central channel, comprising a drug carrier for carrying the therapeutic drug to be delivered, an ultrasound transducer assembly for providing an ultrasound-guided drug delivery mode, and a handheld controller for adjusting the millimeter-level displacement of the drug carrier into the middle ear cavity; wherein, the ultrasound transducer assembly comprises a flexible substrate and multiple piezoelectric transducer units integrated on the flexible substrate, the multiple piezoelectric transducer units constituting a phased array transducer array. This device solves the technical problems of inaccurate drug delivery, low drug delivery efficiency, inability to adapt to the ear canal structure, and complex operation in the prior art.

A smart ultrasonic integrated-circuit that allows at least one MEMS device to be combined with a piezoelectric transducer in a sensor array module. The sensor array module is capable of additional functionality for an advanced driver assistance system. For example, the MEMS device can add functionality because its wide bandwidth allows for simultaneous detection of audio signals and ultrasonic signals. Accordingly, the sensor array module may provide dual-mode (audio and ultrasonic) sensing in a single module. Additionally, the size / cost of a MEMS device allows for the use of a two-dimensional array for receiving ultrasonic echoes which can add a dimension to the ultrasonic range detection for a vehicle.

A pump (1), intended for pumping fluid between an inlet and an outlet, comprising: a first annular piezoelectric transducer (11), extending around a central axis (Δ), and comprising a first electrode (12); a first resonator (10), connected to the first piezoelectric transducer, and extending around the central axis, the first resonator thinning towards the central axis and deforming under the effect of a polarization of the first piezoelectric transducer; a control unit (30), configured to polarize the first electrode according to a polarization voltage; the first resonator delimits a cavity (2), extending around the central axis, and configured to receive the fluid; the pump comprises at least one channel (4), opening from the cavity; under the effect of the polarization of the first piezoelectric transducer, a deformation of the resonator occurs, locally and transiently reducing the thickness of the cavity

The application discloses a longitudinal-bending coupling adaptive livestock and poultry meat ultrasonic cutting system and method based on acoustic black hole effect, and belongs to the technical field of food processing machinery equipment. The ultrasonic cutter head of the cutting unit has an energy focusing transition section; a cooling flow channel is arranged in the ultrasonic cutter head; a tissue recognition module is used for determining the type of livestock and poultry meat tissue to be cut; a piezoelectric sensor is used for detecting the electrical impedance signal of the piezoelectric transducer in real time; an adaptive control module is internally provided with an impedance reference parameter library, the parameter library stores target impedance values corresponding to different livestock and poultry meat tissue types; the adaptive control module receives the tissue type information; according to the tissue type information, the corresponding target impedance value is called from the impedance reference parameter library; the working frequency of the ultrasonic wave generator is dynamically adjusted; the application can adaptively adjust the output according to the change of the tissue type in livestock and poultry meat cutting, and can effectively control the thermal damage while improving the cutting efficiency.

The application provides a kind of encapsulated ultrasonic transducer and a kind of wet porous membrane extraction method, belong to lithium ion battery membrane preparation technical field.The encapsulated ultrasonic transducer provided by the application adopts stainless steel shell and flange to form airtight space, realizes the encapsulation of the outside of the rear end and front cover plate of half-wavelength sandwich type piezoelectric transducer, ensures that each ultrasonic transducer can independently act on extraction liquid, directly contacts and couples with extraction liquid through the setting of amplitude lever probe, the vibration transmission path is short, the energy utilization rate is higher, the sound field distribution is more uniform, and the cavitation effect is stronger.The amplitude lever probe can form a concentrated and stable excitation surface, can form a controllable strong ultrasonic field on the surface of the base film, avoid the problems of sound field blind area, local overheating or uneven cavitation easily occurred in the built-in ultrasonic transducer, and further improve the extraction efficiency of the membrane.

The application discloses an ultrasonic sensor, a control method thereof, and an electronic device. The ultrasonic sensor comprises a transmitting circuit comprising an LC resonant circuit composed of a center-tapped transformer and a piezoelectric transducer in parallel; the LC resonant circuit further comprises a matching capacitor connected in parallel between a first common node and a second common node, and a damping resistor connected between the first common node and a ground terminal; the second common node and one end of the piezoelectric transducer connected to the second common node are both connected to the ground terminal; a receiving circuit comprising the piezoelectric transducer and a sampling component connected in parallel to the piezoelectric transducer; a switch circuit connected between the damping resistor and the ground terminal; further comprising a bias resistor connected between the first common node and the second common node; and a control circuit configured to control the switch circuit to be turned on in a transmitting phase and turned off in a receiving phase.

Cylindrical shell comprising a vibration damping system. The present invention relates to a cylindrical shell comprising a cylindrical wall delimiting an internal space, the shell being capable of radial deformation under the effect of vibrations. The shell comprises a vibration damping system comprising at least one pair of piezoelectric transducers (22) connected in parallel and arranged symmetrically on the wall of the shell, each piezoelectric transducer (22) being connected to a respective dissipative circuit (24) comprising at least one resistor (26) and one inductor (28). The damping system (20) further comprises, for each pair of piezoelectric transducers (22), an additional resonant circuit (32) connected in parallel with said pair of piezoelectric transducers (22) and comprising at least one resistor (36) and one inductor (38). Figure for the abstract: Figure 3

Bicycle Pedal The invention relates to a bicycle pedal comprising: A pedal axle (30), A pedal body (20) comprising at least one bearing face (22) on which a cyclist is capable of exerting a radial force on the pedal axle (30), At least one connecting member (50) mechanically connecting the pedal body (20) to the pedal axle (30) comprising: a mechanical bearing (60) having an inner ring (62) fixed relative to the pedal axle (30) and an outer ring (64) fixed relative to the pedal body (20), at least one piezoelectric transducer (70) extending between the mechanical bearing (60) and one of the pedal axle (30) and the pedal body (20). Figure for the abstract: Fig. 1

This application provides a clamp-on flow meter, comprising a housing and two piezoelectric transducers disposed within the housing. The piezoelectric transducers are arranged to emit and receive ultrasonic waves. An inclined mounting surface is provided within the housing, and the piezoelectric transducers are fitted to this surface, with the two transducers symmetrically arranged facing each other. The ultrasonic wave incident angle of the piezoelectric transducers is set to a range of 20-35°. Based on this incident angle range, the spacing between the two piezoelectric transducers is matched to a range of 30-35 mm. This application, combining Snell's law, by limiting the ultrasonic wave incident angle and the spacing between the two piezoelectric transducers, and using a coupling element, couples the energy of the piezoelectric transducers to the pipe under test, achieving universal measurement for both metal and non-metal pipes. Flow detection for pipes of different materials can be completed without replacing the flow meter with a dedicated one.

This invention discloses a planar membrane mass transfer internal component, a collection tower, and a collection system based on sound field enhancement. The planar membrane mass transfer internal component includes several vertically arranged resonant composite plates and a support assembly for supporting the resonant composite plates. The resonant composite plates are layered structures with double-sided mass transfer, comprising, from the inside out, a piezoelectric transducer array layer, an acoustic impedance matching layer, and a hydrophilic microporous mass transfer layer. The piezoelectric transducer array layer is electrically connected to a power supply to generate high-frequency mechanical vibration, thereby forming a high-frequency sound field. The support assembly includes several limiting grooves located above and below the resonant composite plates, and a frame for fixing the limiting grooves. The resonant composite plates are floatingly installed within the limiting grooves, with their upper and lower ends forming a limiting fit with the limiting grooves. This invention significantly improves mass transfer efficiency by disrupting the boundary layer of high-viscosity liquid films at the microscale using active sound field technology, and solves the problem of fixing and damping piezoelectrically brittle components in industrial towers by employing a floating installation structure.

The application discloses a layered defect linear frequency modulation Lamb wave and full convolution network imaging method and system, and belongs to the technical field of neural network imaging methods.The imaging system comprises a plurality of piezoelectric transducers distributed on the surface of a carbon fiber plate to be detected, a channel switcher electrically connected with the piezoelectric transducers, a signal generator capable of generating multi-frequency Lamb waves and an acquisition card electrically connected with the channel switcher; wherein the signal generator adopts a linear frequency modulation mode to excite Lamb waves, the imaging method can receive linear frequency modulation Lamb wave signals through the piezoelectric transducers, extract time-frequency domain features of the linear frequency modulation signals, and then fuse multi-frequency information in the linear frequency modulation Lamb waves through a full convolution neural network and directly output a defect imaging result.

The utility model discloses an ultrasonic sensor, fingerprint identification device and electronic equipment, this ultrasonic sensor includes: substrate, piezoelectric transducer is set up on the substrate, first chip is set up on the substrate, and with piezoelectric transducer electric connection, the first chip includes one of emission chip, receiving chip and integrated chip, wherein the integrated chip integrates the circuit of emission chip and receiving chip. According to the ultrasonic sensor of the utility model embodiment, can shorten the transmission path between piezoelectric transducer and first chip, and be favorable to reduce the size of sensor.

A method for testing a drug delivery device including a piezoelectric transducer, a microcontroller, and a DC power source, with the piezoelectric transducer having an operative state and inoperative state. The method includes providing a drive signal to the piezoelectric transducer of the drug delivery device, determining an actuation voltage value or an actuation current value, and comparing the actuation voltage value or the actuation current value to a baseline value to determine whether the piezoelectric transducer is in the operative state or the inoperative state.

This invention discloses a sound field modulation device and method based on a multifunctional acoustic metasurface. The acoustic metasurface is installed at the acoustic radiation end of a partitioned piezoelectric transducer for phase modulation of the sound waves excited by the transducer. The partitioned piezoelectric transducer includes partitioned piezoelectric ceramics and a control circuit. The partitioned piezoelectric ceramics are circular and radially divided into an inner circular electrode partition and an outer annular electrode partition. Each electrode partition is electrically connected to the control circuit to independently excite different electrode partitions to generate sound waves. The acoustic metasurface is radially divided into phase modulation regions corresponding one-to-one with the electrode partitions of the partitioned piezoelectric ceramics. Each phase modulation region is equipped with a different phase coding pattern to form sound fields with different functions under different electrode partition excitation states. This invention achieves a multifunctional sound field by switching the partitioned electrodes, which can significantly improve the efficiency of detection and treatment in non-destructive testing and medical ultrasound, and broaden the utilization rate of planar ultrasound transducers.

Disclosed herein are ultrasonic transducers that are selectively insulated to thereby enable the transducers to be exposed to electrically conductive fluids without causing a short between electrodes of the transducers. Such transducers include a piezoelectric transducer body having a first surface and a second surface that are spaced apart from and do not intersect each other. The ultrasonic transducers also include a first electrode disposed on the first surface, a second electrode disposed on the second surface, and an electrical insulator covering only one of the first and second electrodes and configured to prevent electrical conduction between the first and second electrodes when the ultrasonic transducer is placed within an electrically conductive fluid. Devices and systems including such transducers are also disclosed. Related methods are also disclosed herein.

An optical lens cleaning method based on ultrasonic vibration coupling amplification mechanism is disclosed. This method involves fixing a piezoelectric transducer at the ultrasonic output end of an ultrasonic microscope. By applying an alternating current signal to the piezoelectric transducer and amplifying the axial displacement of the lens, optical lens cleaning is achieved. This invention leverages the numerous advantages of ultrasonic cleaning, such as no direct contact with the object surface, high cleaning efficiency, reusability, applicability to complex-shaped devices, and good material compatibility. Based on high-frequency acoustic wave vibration, ultrasonic waves generate microbubbles in a liquid. The bursting action of these bubbles effectively removes contaminants from the object surface, enabling continuous real-time lens cleaning, avoiding interruptions to the procedure, and offering flexible and convenient operation.

This utility model discloses a fully automatic liquid concentration measuring device, relating to the field of liquid concentration measurement technology. The device includes a liquid tank, an ultrasonic transceiver assembly, and an automatic measuring assembly. The liquid tank holds the liquid to be tested. The ultrasonic transceiver assembly includes a support base, a piezoelectric transducer assembly, and a distance adjustment component. The support base is fixedly installed above the liquid tank, and the piezoelectric transducer assembly and the distance adjustment component are mounted on the support base. During testing, the automatic measuring assembly can cooperate with the ultrasonic transceiver assembly to change the relative positions of the ultrasonic transmitter and receiver. This allows the automatic measuring assembly to determine the liquid concentration based on changes in the ultrasonic signal, following a predetermined linear relationship between the ultrasonic wave propagation velocity in the solution and the solution concentration. This achieves automated detection of liquid concentration and automatically records experimental data, thereby effectively improving the efficiency of liquid concentration detection and enhancing the accuracy and reliability of the test results.

A dilation device for an intra-body lumen, for example, a urethra partially occluded by an enlarged prostate in the form of a resilient curved body configured to be implanted in a cut around the lumen, and a method for dilating such a lumen by implanting a dilation device in a cut around the outside of the lumen. Also, a deployment system including a delivery device for the implant, and a device for dilating the lumen before and while the cut is being made, and a method of using the implant and the deployment system. The implant may be formed of a strip or a coiled wire. The cut may be performed in part by the implant. The cut may be performed by a sharp edge, and / or by application of electrical current to the area being cut, or by a piezoelectric transducer.

This invention discloses an intelligent access control system, belonging to the field of security monitoring. Addressing the problem that existing access control systems fail in power outages and cannot perceive user intent, this invention includes: an energy wake-up module that uses a piezoelectric transducer to convert the mechanical energy of knocking into electrical energy, switching between full perception, emergency alarm, or energy accumulation modes based on the supercapacitor voltage; a multimodal perception module that collects facial, touch pressure, and environmental data and performs adaptive compensation; a state interpretation module that identifies coercive states by associating facial micro-expressions with touch tremors and identifies attack states by associating vibration spectra with non-biological contact; and a decision execution module that executes normal unlocking, silent alarm, or audible and visual locking accordingly. This invention achieves zero-power standby, passive start-up, surface unlocking and covert alarm in coercive scenarios, and active defense in attack scenarios, significantly improving the energy reliability and security intelligence level of the access control system.

A system for transmitting ultrasonic waves, the system including a microchip (300) for driving a resonant circuit and a resonant circuit which is at least one of an inductance (L) capacitance (C) circuit (LC tank), an antenna and a piezoelectric transducer. The microchip (300) is a single unit which includes a plurality of interconnected embedded components and subsystems including at least an oscillator (315), a pulse width modulation (PWM) signal generator subsystem (329), an analogue to digital converter (ADC) subsystem (318) and a digital to analogue converter (DAC) subsystem (327).

The application discloses a kind of linear feeding device and method based on piezoelectric transducer inertia drive, feeding device includes base, first to fourth spring piece, first to second connecting block, piezoelectric transducer, top disc, piezoelectric bimorph, first to third stop piece, and M+N+P adjusting bolts;When working, sine excitation signal is applied to piezoelectric transducer, the second order longitudinal vibration mode of piezoelectric transducer can be excited, to induce the reciprocating bending vibration of spring piece, drive top disc to generate horizontal and vertical direction movement.Material placed in top disc moves forward and upward with top disc in material groove.When spring piece moves to limit position, elastic potential energy stored in spring piece drives top disc to move back, at this time, material continues to move forward and falls under the action of inertia in parabolic curve.Under this periodic motion, the transportation of material in top disc is realized.The application has simple structure, and is easy to process and assemble.

A sensor assembly and a driving method therefor, and a display substrate. The sensor assembly comprises: a piezoelectric transducer (20) and a signal processing circuit (10). The signal processing circuit (10) comprises: a voltage-stabilizing sub-circuit, which is configured to store the voltage difference between a signal of a constant voltage signal terminal (AP) and a signal of a first node (N1); a reading sub-circuit, which is configured to provide, under the control of a signal of a first control signal terminal (Gate1), a signal of a second node (N2) to a signal reading terminal (Read); and a node control sub-circuit, which is configured to provide a signal of a bias voltage terminal (BIAS) to a third node (N3) and provide a signal of the third node (N3) to the first node (N1) under the control of signals of a second control signal terminal (Gate2) and a third control signal terminal (Gate3). The piezoelectric transducer (20) is configured to transmit an ultrasonic wave under the control of a signal of a transmission signal terminal (Tx), convert an ultrasonic wave signal reflected by a fingerprint to be recognized into an electrical signal, and transmit the electrical signal to the third node (N3).

The application relates to a notebook computer heat dissipation technical field, and particularly discloses a piezoelectric driving type fluid disturbance heat dissipation device which comprises a heat conduction plate, a heat pipe, a power module and a pair of piezoelectric transducers; a containing chamber is arranged in the heat conduction plate, a groove is arranged on the top surface of the heat conduction plate, and a liquid injection pipe is arranged on the top surface of the heat conduction plate; a valve is arranged on the liquid injection pipe; the heat pipe is installed in the groove, a plurality of heat dissipation fins are arranged on the outer walls of the two ends of the heat pipe; the power module is installed on the top surface of the heat conduction plate; the piezoelectric transducers are installed on the top surface of the heat conduction plate and electrically connected with the power module; a silent air blowing mechanism is arranged on the top surface of each end of the heat pipe; the piezoelectric transducers are used for continuously fluctuating the heat conduction fluid, so that heat is uniformly diffused to the whole heat conduction plate to realize active heat equalization; after the heat pipe absorbs heat, the heat is transmitted to the heat dissipation fins at the two ends; the silent air blowing mechanism is used for air cooling the heat dissipation fins to realize rapid heat dissipation; the heat conduction fluid continuously disturbs in the whole process, no heat is accumulated, and efficient and stable heat dissipation of the electronic heat generating components is realized.

This invention relates to a device and method for detecting dental microcracks based on Rayleigh wave transmission attenuation and nonlinear response, belonging to the fields of biomedical engineering and nondestructive testing technology. The device includes a flexible dental crown detection device composed of two sets of flexible semi-circular probe assemblies. An ultrasonic transceiver array is embedded in the inner wall of each set of flexible semi-circular probe assemblies. The ultrasonic transceiver array is composed of several micro piezoelectric transducer elements arranged circumferentially. The front end face of the micro piezoelectric transducer elements faces the enamel surface, and the opposite end face is provided with an air backing layer, which can adaptively conform to the complex curved surface of the tooth and realize early qualitative identification and quantitative assessment of the depth of microcracks.

This application provides a multi-source energy harvesting system, control method, and related equipment, belonging to the field of energy recovery technology. The solution includes: multiple energy conversion devices, a switch control device, an energy storage device, a detection device, and a controller. The energy conversion devices include: piezoelectric transducers, photovoltaic cells, and thermoelectric generators; at least one multi-source energy conversion device is connected to the energy storage device, supplying energy to the energy storage device. When multiple energy conversion devices are connected to the energy storage device, they resonate in series. The detection device is connected to both the energy conversion device and the energy storage device. The controller is connected to both the detection device and the switch control device, and controls the switch control device to turn on or off based on the detection results. This embodiment can detect multiple energy conversion devices and determine that the energy released by the piezoelectric transducer, photovoltaic cell, and thermoelectric generator meets the absorption conditions.

The application discloses a wireless flexible cortex brain-computer interface device based on ultrasonic energy supply and a signal acquisition method thereof. The device comprises an extracorporeal ultrasonic transceiving unit and a passive flexible intracorporeal implant unit. The intracorporeal implant unit comprises a flexible substrate, a recording electrode unit arranged on the side of the flexible substrate facing the cerebral cortex, and a piezoelectric transducing unit and a load modulation unit arranged on the back side or lateral area of the flexible substrate. The piezoelectric transducing unit receives extracorporeal ultrasonic waves and converts them into electric energy. The load modulation unit adjusts the port load impedance of the piezoelectric transducing unit in a continuous analog mode according to the cortical electrophysiological signals collected by the recording electrode unit, thereby modulating ultrasonic backscattering echoes. The extracorporeal ultrasonic transceiving unit receives and demodulates the backscattering echoes to reconstruct the cortical electroencephalogram signals. The application can realize wireless acquisition of the cortical electroencephalogram signals without the need of intracorporeal batteries and transcutaneous leads, and improve long-term implant stability in a flexible cortex attachment state.