438 results about "Piezoelectric transduction" patented technology

The invention relates to a board band piezoelectric generating set. A plurality of socle beams L1, L2, L3 are divided into two groups; one end of each socle beam is fixed and the other end keeps free; the socle beams keep parallel with each other; a crossing section is arranged between the two groups of the socle beams; wherein, the socle beam consists of piezoelectric transduction elements (34, 36), a down-lead (31), a metal block (32) and electrodes (33, 35, 37). The electrodes and the transduction elements are alternately arranged; the down-lead (31) is arranged at the fixed end of the socle beam; the metal block (32) is arranged at the free end of the socle beam. The sizes and the structures of the socle beams L1, L2, L3 are different, the manufacture materials of the piezoelectric transduction elements are different and the qualities of the metal blocks are different, therefore, the resonance frequency of each beam is different. The two groups of the socle beams L1, L2, L3 are arranged in an interdigital structure in plane or an interdigital structure in space. The board band piezoelectric generating set can absorb the mechanical vibration or noise of a plurality of frequency components in the environment and realize the transformation from mechanical energy to electricity energy by the piezoelectric transduction elements so as to increase the generating capacity and improve the generating efficiency.

An electrostatic transducer for micromechanical resonators, in which the electrode gaps are filled with a dielectric material having a much higher permittivity than air. This internal electrostatic transducer has several advantages over both air-gap electrostatic and piezoelectric transduction; including lower motional impedance, compatibility with advanced scaled CMOS device technology, and extended dynamic range. In one aspect, in order to minimize energy losses, the dielectric material has an acoustic velocity which is matched to that of the resonator material. Internal electrostatic transduction can be adapted to excite and detect either vertical modes (perpendicular to the substrate) or lateral modes (in the plane of the substrate). Its increased transduction efficiency is of particular importance for reducing the motional resistance of the latter.

A downhole tool includes circumferentially spaced and/or angled transducer elements. In one embodiment a standoff sensor has at least three piezoelectric transducer elements, at least a first element of which is configured to both transmit and receive ultrasonic energy. At least second and third of the elements are configured to receive ultrasonic energy transmitted by the first element in pitch catch mode. An electronic controller is configured to calculate a standoff distance from the ultrasonic waveforms received at the first, the second, and the third piezoelectric transducer elements. The controller may further be configured to estimate the eccentricity of a measurement tool in the borehole. Exemplary embodiments of the invention may improve borehole coverage and data quality and reliability in LWD caliper logging. In particular, the invention may advantageously reduce or even eliminate blind spots when logging eccentric bore holes.

An imaging system includes: a transceiver cell for generating a pressure wave and converting an external pressure wave into an electrical signal; and a control unit for controlling an operation of the transceiver cell. The transceiver cell includes: a substrate; at least one membrane suspending from the substrate; and a plurality of transducer elements mounted on the at least one membrane. Each of the plurality of transducer elements has a bottom electrode, a piezoelectric layer on bottom electrode, and at least one top electrode on the piezoelectric layer. Each of the plurality of transducer element generates a bending moment in response to applying an electrical potential across the bottom electrode and the at least one top electrode and develops an electrical charge in response to a bending moment due to the external pressure wave.

The invention discloses a micro-electromechanical system piezoelectric transducer and a manufacturing method thereof, in particular an array piezoelectric transducer and a manufacturing method, and belongs to the micro-electromechanical system field. The transducer adopts array design and is composed of at least two array elements. The wafer-level electrical series connection or parallel connection between the array elements is realized by a micro-electromechanical system (MEMS) process compatible with the semiconductor process, but at least one electrical series connection is provided; Semiconductor MEMS process can effectively control the parasitic capacitance generated by electrical series and parallel connection, thus effectively improve the sensitivity. The invention improves the sensitivity of the transducer through the wafer-level electric series and parallel connection between the array elements. Compared with the traditional piezoelectric ceramic transducer, the parasitic capacitance caused by the following circuit string and parallel connection is avoided. A wafer-level array MEMS transducer is proposed. The array transducer can be connected in series with different arrayelements according to the needs, so that the sensitivity of the transducer can be defined independently. The transducer also has the advantages of high signal-to-noise ratio, low cost, low electricalnoise and high signal-to-noise ratio.

A noise reduction system for use with an exhaust nozzle associated with a jet engine of an aircraft. The noise reduction system employs a plurality of flow-altering components disposed circumferentially about a lip portion of an exhaust nozzle. In one preferred form the flow-altering components each comprise piezoelectric transduction layers. The flow-altering components are caused to move in an oscillating manner by an AC signal applied thereto such that they move into and out of the exhaust gas emitted from the exhaust nozzle to achieve a desired degree of intermixing of the exhaust flow with the flow adjacent the exhaust nozzle. This produces a reduction in the noise generated by the jet engine. The noise reduction can be utilized during takeoff conditions of an aircraft. The flow-altering components are maintained out of the exhaust gas flowpath during cruise conditions of the aircraft so as not to cause a reduction of thrust, that would in turn result in an increase in the fuel burn during cruise conditions.

The invention discloses a manganese-doped niobium nickel-lead zirconate titanate piezoelectric ceramic material and a preparation method thereof. The composition of the piezoelectric ceramic material is Pb[(Ni1/3Nb2/3)x(ZryTi1-y)1-x]O3+zM, wherein in the formula, x, y and z represent the molar content; M is manganese or oxide of manganese; and x is more than 0.0 and less than 0.9, y is more than 0.0 and less than 0.8, and z is more than 0.0 and less than 0.3. The novel piezoelectric ceramic material with excellent comprehensive performance is obtained by preserving heat and sintering for 0.5 to 10h at the temperature of 1,000 to 1,300 DEG C by the traditional solid-phase sintering process; and the piezoelectric ceramic material has a relatively high mechanical quality factor (Qm-670), a good ferroelectric property (Ec-4.3kV/cm) and a good piezoelectric property (d33-495pC/N). The novel piezoelectric ceramic material is mainly applied to devices such as micro-actuators, piezoelectric transducers, surface wave filters and piezoelectric sensors.

The invention discloses a traffic load pavement vibration energy piezoelectric power generation measuring method and a system thereof. The traffic load pavement vibration energy piezoelectric power generation measuring system comprises a piezoelectric transduction unit, a total control module and a total measuring module which are arranged on a pavement. The piezoelectric transduction unit is used for converting pavement vibration energy into electric energy. The total control module is used for regulating speed and applying load for running vehicles and regulating electric parameters for output electric power. The total measuring module is used for measuring speed and load of a vehicle, stress and deformation of the pavement, harvested alternating-current and voltage, and transduced voltage and current. The generated electric energy can be used as a power supply to be stored and utilized. According to above condition, the traffic load pavement vibration energy piezoelectric power generation measuring system provides conditions for researching a mechanism of a pavement piezoelectric energy harvesting technology, application and popularization of the technology, and has a high academic value and social value.

The invention discloses a supermarket payment system based on an NFC technique and a payment method thereof. The system is composed of an NFC payment unit, an RFID reading unit, a liquid crystal display screen, an infrared detection unit, a keyboard unit and a payment control unit. A whole payment zone is divided into a waiting zone and a payment zone. The waiting zone and the payment zone are separated from each other by a first gate inhibition. The boundary of the payment zone is defined by the first gate inhibition and a second gate inhibition. The RFID is composes of three RFID readers which are in parallel arrangement in the payment zone. The first two RFID readers are activated by an infrared sensor in the waiting zone. When the second reader has new data, the third reader is activated, and an electronic label is further read. Could computing enables various data to be stored in a cloud, so that largest sharing of the data can be realized. The structure of RFID three-parallel arrangement enables the reading of the electronic label to be more comprehensive and accurate. In addition, piezoelectric transduction equipment enables electric energy to be saved, and outage emergency response capability is improved.

A mass energy conversion device adopting gas energy storage and double-cylinder reciprocation vibrating piezoelectric transduction and applied to railway remote monitoring comprises a box, travel transforming mechanisms, pressure energy storage mechanisms, a high-pressure gas storage cavity and a pneumatic power generation mechanism. The device can convert vibration kinetic energy during train operation into electric energy and provide energy for railway remote monitoring equipment, and long-term stable remote monitoring for safe operation of the railway can be realized in an environment without power and a power supply.

The invention discloses a piezoelectric transduction type magnetostrictive sensor used for liquid level (displacement) measurement and a piezoelectric type torsional wave transducer thereof. The piezoelectric type torsional wave transducer comprises a waveguide wire, the output section of the waveguide wire is provided with an amplification rod, and the ends of the amplification rod are connectedwith piezoelectric elements. After a torsional wave signal is transmitted to the amplification rod through the waveguide wire and is amplified, the torsional wave signal is converted into an electricsignal and output. A normal line of each piezoelectric element is vertical to the waveguide wire and the amplification rod. The amplification rod converts circumferential torsional waves transmitted by the waveguide wire into distortion approximate to a linear direction on the normal line of each piezoelectric element so as to act on the piezoelectric elements to generate charges. Two ends of theamplification rod are respectively provided with the piezoelectric elements with same polar directions, and the piezoelectric elements can simultaneously generate differential piezoelectric signals. The piezoelectric type torsional wave transducer has the advantages that the commonly-used piezoelectric ceramic plates of a thickness oscillating mode are used as the piezoelectric elements, thus thecost is low; the transducer has simple structure and simplified process; and the piezoelectric elements can be used for directly converting mechanical signals into voltage signals, thus the advantages of fewer links and high sensitivity are achieved.

An integrated circuit device includes a multi-port piezoelectric-on-semiconductor microelectromechanical resonator, which is configured to support independent and concurrent piezoelectric transduction of multiple resonance modes. The resonator includes a semiconductor resonator body (e.g., Si body) suspended opposite an underlying recess in a substrate. Opposite ends of the semiconductor resonator body are anchored to the substrate. The resonator body may be formed so that a plan layout view of a portion of the semiconductor resonator body is dumbbell-shaped to thereby support acoustic energy trapping of multiple high-Q resonance modes.

The invention discloses an ultrasonic precision micro-fluidic chip based on a nano motor array and an implementation method thereof. The ultrasonic precision micro-fluidic chip comprises a substrate,a cover plate, a piezoelectric transducer, a film fixed with a nano motor, a liquid inlet and outlet pipe and a liquid medium. The piezoelectric transducer excites and drives the whole micro-fluidic chip to vibrate at ultrasonic frequency, a specific acoustic flow field is generated in the micro-channel, meanwhile, a catalyst component contained in the nano-motor promotes the substrate to be decomposed to generate bubbles, and vibration of the bubbles in the acoustic flow field is used for controlling small particles around the bubbles to move along a specific track. The liquid medium is catalyzed by the nano motor array to be decomposed to generate bubbles, and directional movement of tiny particles is controlled by utilizing local acoustic flow field change caused by bubble vibration. According to the micro-particle motion control mode, bubble vibration in the acoustic flow field is used as a power source, the motion speed of the micro-particles is effectively increased, the micro-particles of various shapes and sizes can be controlled, no special requirement is needed for the material of the controlled micro-particles, and thus the application range is wide.

The invention discloses a piezoelectric linear motor fused with a shear piezoelectric actuator composite drive mode and a preparation method thereof. The piezoelectric linear motor comprises a piezoelectric harmonic oscillation piezoelectric transducer, a shear piezoelectric actuator, a drive circuit, a slider, a friction head fixed to the shear piezoelectric actuator, and peripheral parts. The harmonic oscillation piezoelectric transducer and the shear piezoelectric actuator are tightly bonded together to form a composite piezoelectric drive stator. The friction head and the slider in a sliding assembly are in close contact. The harmonic oscillation piezoelectric transducer and the shear piezoelectric actuator are provided with an upper surface electrode and a lower surface electrode. The piezoelectric motor can be driven in a harmonic, direct-current or composite mode, can produce macroscopic continuous linear motion and sub-micron and nanometer motion, and can produce big driving force. The piezoelectric linear motor of the invention is simple in structure and convenient to make, and can be popularized and applied in the field of precision driving.

The invention relates to a stress gauge of the type having an acoustic resonant structure, including a piezoelectric transducer (10) connected to a holder (20), the holder (20) including opposite the piezoelectric transducer (10) an imbedded reflecting portion (40). The imbedded reflecting portion (40) reflects the volume acoustic waves generated by the piezoelectric transducer (10) when it is excited according to a harmonic mode of the structure and propagating into said holder (20), the reflecting portion (40) being arranged at a distance from the piezoelectric transducer (10) such that the integral of the stress on the propagation distance of the volume acoustic waves up to their reflection is different from zero.

The invention relates to a resonator of the harmonic bulk acoustic resonator HBAR type, comprising a piezoelectric transducer (6) clamped between two electrodes (4, 8) with a strong electroacoustic coupling, cut according to a first cutting angle T1, and an acoustic substrate (10) with a working frequency acoustic quality coefficient at least equal to 5.1012, cut according to a second cutting angle T2 with at least one shearing vibration mode. The transducer and the substrate are arranged in such a way that the polarisation direction of the shearing mode of the transducer and the polarisation direction of the shearing of the substrate are aligned, and the second cutting angle T2 is such that the temperature coefficient of the frequency of the first order CTFB1 corresponding to the shearing mode and to the second cutting angle T2 is zero with inversion of the sign thereof on either side of, or equal to, a bias.

An ultrasonic transducer which can attenuate ultrasonic waves emitted toward the rear without increasing a thickness of a backing layer includes: a piezoelectric transducer which emits and receives ultrasonic waves; and the backing layer which is provided in contact with the rear of the piezoelectric transducer and which attenuates the ultrasonic waves emitted in a rear direction from the piezoelectric transducer. The backing layer includes a plurality of acoustic tubes formed in the rear direction from a plane of the backing layer that is in contact with the piezoelectric transducer. Each of the acoustic tubes has a different length based on a principle of superposition of acoustic waves. The acoustic tubes include an acoustic tube which has (i) a portion of the length formed in a direction perpendicular to the rear direction and (ii) the remaining portion of the length formed in a direction parallel to the rear direction.

A transducer assembly may comprise a thickness-mode piezoelectric ceramic body, a pair of foil conductors with mesh end portions, and a coupling medium used to fill in the interstices in the meshes. The foil conductors are held in contact with the electrode layers by a selected combination of adhesive mechanical clamping forces. One of the conductors is placed between one face of the ceramic body and a window that separates the transducer assembly from a fluid to be measured. The other conductor is held between the other face of the ceramic body and a backing body, which may be an acoustic isolator or a resonant isolating structure comprising a resonant body and an acoustic mass that is substantially heavier than the ceramic element. The structure may additionally comprise isolating sheets of material, which may be polymeric, that are positioned on either side of the resonator so that one of them is between the resonator and the backing body and the other is between the resonator and the surface with the foil conductor.