234 results about "Acoustic resonance" patented technology

The invention discloses an automatic processing device and method for PCB lamination, and the method comprises the steps: depositing an erodable film on a lamination material layer and arranging a cavity concentric with a through hole array before the lamination of a PCB, and collecting acoustic resonance frequency data to obtain a reference matrix; dynamic dot frequency tracking processing is carried out on the multi-point acoustic time sequence signals in the pressing heating stage, and a through hole instantaneous acoustic track library is obtained; performing coupling judgment on time-temperature-pressure ternary working condition data according to the trajectory library to obtain a blockage risk matrix; carrying out time delay and gradient adjustment on a pressing temperature and pressure curve based on the risk matrix; and carrying out three-dimensional inversion processing on the whole board broadband acoustic spectrum collected before cooling, calculating through hole filling rate distribution and judging the quality of the board. According to the scheme, the resin filling state of the micro through hole can be monitored in real time in the PCB pressing process, an acoustic detection channel is constructed through the erodable film and the cavity structure, early warning and active intervention of the blocking risk are achieved, and the pressing quality is ensured.

The invention relates to a method for preparing bimetallic core-shell structure composite powder based on an acoustic resonance technology, and belongs to the technical field of powder metallurgy. Adding the micron matrix metal powder and the nano coating layer metal powder into a mixing tank, replacing air in the mixing tank with protective gas or active gas, and setting the pressure of the gas in the tank and the temperature of the tank body; and then three-section acoustic resonance coating powder preparation is carried out, and the bimetal core-shell structure composite powder is obtained. According to the method, different metal powder is driven by acoustic resonance to do violent disordered movement, the outer layer of micron metal powder is evenly and tightly coated with nano metal powder under the combined action of electrostatic force and other physical force, and finally the core-shell structure bimetal coated powder is obtained. The method is simple, the preparation efficiency is high, the applicability is wide, the thickness adjustable range of the coating layer of the obtained bimetallic coated powder is wide, the obtained bimetallic coated powder is uniform and compact, the powder particle morphology can be effectively maintained, and pollution of other elements is avoided.

The invention discloses a frequency mixing sound demodulator based on a curled structure and a use method thereof in the acoustics field, the demodulator is used for separating frequency mixing sound mixed by a plurality of sound waves with preset frequencies according to respective frequencies, and the demodulator comprises an air waveguide for transmitting the sound waves, and blocking structures arranged on two sides of the air waveguide for blocking the sound waves from penetrating, and a plurality of curled structures that capture corresponding preset frequency sound waves; curled structures are arranged in the barrier structure on at least one side of the air waveguide at intervals, one end of each curled structure is open, and the other side is closed; a plurality of cross beams for blocking penetration of sound waves are arranged in each curled structure, and an internal channel of each curled structure is divided into different lengths to serve as different acoustic resonant cavities so as to capture the sound waves with different frequencies; the closed end of each curled structure is a detection end of each preset frequency sound wave. The invention solves the problem that the existing method is difficult to instantly separate the frequency mixing sound signal and carry out information transmission.

The invention discloses a spiral resonance photoacoustic cell and an operation method, the spiral resonance photoacoustic cell comprises a gas chamber straight tube, a spiral tube, an optical fiber collimator and an optical fiber F-P sonic sensor, the two ends of the gas chamber straight tube are open, the two ends of the spiral tube are communicated with the gas chamber straight tube, an acoustic resonance point is formed at the center of the spiral tube, and the optical fiber F-P sonic sensor is arranged in the central area of the spiral tube; and the optical fiber collimator is arranged at one end of the air chamber straight pipe. The spiral pipe is wound outside the air chamber straight pipe, the spiral pipe is communicated with the air chamber straight pipe, the structural design of the spiral pipe enables the spiral pipe to form acoustic resonance at a specific frequency, and the optical fiber F-P sonic sensor obtains a photoacoustic signal; compared with a conventional resonance photoacoustic cell, the physical volume of the resonance photoacoustic cell is greatly compressed, and the system integration level is effectively improved. More importantly, under the condition that a compact appearance similar to that of a non-resonant photoacoustic cell is kept, the device amplifies the photoacoustic signal intensity by several times through an acoustic resonance effect, and the detection sensitivity and the signal-to-noise ratio of the system are remarkably improved.

The invention discloses an unmanned intelligent production line and method for an automobile fan, and the method comprises the steps: carrying out the low-speed rotation starting processing of a rotating blade entering a constant-pressure flow channel, obtaining the temperature rise time sequence data of a shearing heat layer in axial distribution through segmented pressurization and three-stage rotation speed increment, and building a reference temperature rise curve; carrying out differential processing on the wall surface temperature rise data in the blade speed increasing process, extracting a temperature rise curvature over-limit region and generating abnormal annulus coordinate data; determining a submillimeter wave oblique projection direction according to the abnormal coordinates, and performing refraction phase analysis processing on the echo signal to obtain a warping fingerprint parameter set including a refraction peak value, echo trailing, a slope change rate and a phase oscillation period; and activating acoustic sampling of a corresponding area, obtaining gas-acoustic resonance standing wave data, and performing cross validation with the warping fingerprint parameters to obtain a quantitative detection judgment result of the geometric defect of the blade. According to the scheme, high-precision online detection of the fan blade microdefects can be realized in an all-black factory environment.

The present invention provides an acoustic resonator device (1) having a resonator (R) comprising: a first electrode (2), a second electrode (3) arranged at a distance from the first electrode (2) in a first direction (z), wherein the first electrode (2) and the second electrode (3) extend along planes (E) arranged perpendicular to the first direction (z); and a layer stack (S) arranged between the first electrode (2) and the second electrode (3), which layer stack comprises a first piezoelectric layer (4) and a second piezoelectric layer (5), wherein the first piezoelectric layer (4) and a second piezoelectric layer (5) comprise a piezoelectric material, and an acoustic high-impedance layer (6) arranged between the first piezoelectric layer and the second piezoelectric layer;wherein an acoustic thickness (DR) of the resonator in the first direction (z) is n times half an acoustic wave (W) of a predetermined frequency, where n is a natural number greater than one. The invention also provides a corresponding filter component (10).

The invention discloses a gas-solid-sound coupled gas compressor acoustic resonance monitoring method and system, a medium and equipment, and the method comprises the steps: determining the installation number and angle of strain gauges based on a blade modal analysis result, or determining the installation number and position of blade end timing sensors according to the number of rotor and stator blades, and determining the installation position of a pressure probe; carrying out a compressor surge test, and synchronously collecting a sound field signal, a vibration signal and a pulsating pressure signal; frequency domain information of the sound field signal, the vibration signal and the pulsating pressure signal is obtained through spectral analysis; carrying out correlation analysis on the sound and vibration signals, and judging whether abnormal asynchronous peak values appear in the sound pressure and vibration signals or not; carrying out acoustic mode decomposition at the abnormal asynchronous peak frequency of the sound field signal, and judging whether the circumferential mode order is coupled with the vibration pitch diameter and the pressure mode or not; the method comprises the following steps: performing continuous broadband acoustic mode decomposition on an acoustic pressure signal to obtain a spectrogram, monitoring whether the spectrogram is matched with an acoustic resonance characteristic or not, and judging whether the compressor has an acoustic resonance fault or not.

The embodiment of the invention provides a piezoelectric antenna, a preparation method thereof and an electronic device. The piezoelectric antenna comprises a piezoelectric layer and an electrode layer, the electrode layer is arranged on a first surface of the piezoelectric layer and comprises a first terminal, a resonance electrode, at least one feed loop and at least one second terminal which are arranged in sequence, the first terminal is configured to receive an input alternating voltage and feed the alternating voltage into the resonance electrode, and the second terminal is configured to receive the input alternating voltage and feed the input alternating voltage into the resonance electrode. The resonant electrode is configured to excite the piezoelectric layer to generate acoustic resonance under the action of alternating voltage, the at least one feed loop is connected with the resonant electrode and comprises a suspended grounding terminal, and the at least one second terminal is arranged at a preset distance from the grounding terminal of the at least one feed loop and is configured to be grounded; and a grounding capacitor is formed between the grounding terminal and at least one feed loop grounding terminal. The piezoelectric layer and the electrode layer are integrally configured to generate electromagnetic waves based on acoustic resonance. The piezoelectric antenna effectively improves the radiation performance of an electrically small antenna excited by acoustic waves.

Acoustic resonator devices and filters are disclosed. An acoustic resonator includes a substrate having a surface. A back surface of a single-crystal piezoelectric plate is attached to the surface of the substrate except for a portion of the piezoelectric plate forming a diaphragm spanning a cavity in the substrate. An interdigital transducer (IDT) is formed on a front surface of the piezoelectric plate with interleaved IDT fingers of the IDT disposed on the diaphragm. Back-side fingers are formed the back surface of the diaphragm.

A novel hybrid band-pass filter is realized using semiconductor integrated hybrid technology, and includes two acoustic resonance units, and one IPD filter unit. The filter unit may be implemented as a high-pass filter, a low-pass filter, or a band-pass filter. The two acoustic resonance units and the IPD filter unit are arranged on a matching substrate, for example, by way of flip-chip technology and welding of electrodes, and a polymer filled shell is formed external to and surrounding the acoustic resonance units and the IPD filter unit to prevent oxidation and to maintain integrity of the weld points. The first acoustic resonance unit is connected with an input terminal of the IPD filter through a matching inductor, an output terminal of the IPD filter is connected with the second acoustic resonance unit through a matching inductor, and finally, the two acoustic resonance units and the IPD filter unit are integrated on the matching substrate. The band-pass filter is characterized by low loss, high suppression, wide passband and high rectangular coefficient, and also has the advantages of small size, high yield, good batch consistency and suitability for batch production.

The invention relates to the technical field of semiconductor packaging, and discloses a bonding wire welding method based on bare chip interconnection, and the method comprises the steps: collecting and fusing acoustic response and optical reflection signals of a bonding interface in real time through a multi-mode in-situ sensing mechanism integrating acoustic resonance and surface plasmon resonance; dynamically calculating the thickness, the mechanical coupling deformation and the energy dissipation state of the intermetallic compound layer; and the ultrasonic power and the bonding force are subjected to closed-loop adjustment in combination with a model prediction control algorithm, so that the welding process is evolved along a preset optimal physical path all the time. The system comprises a multi-mode sensing welding head, a synchronous data acquisition module, a state resolving module and a self-adaptive control module. The transparent and intelligent welding process is realized, and the bonding consistency, reliability and yield of high-density interconnection are remarkably improved.

The invention, which belongs to the microwave communication field, discloses a multi-physics-field coupling high-Q-value magnetoacoustic resonator comprising a YIG film, a GGG film substrate, a grounding electrode and a microstrip line. The YIG film generates ferromagnetic resonance under the action of an external magnetic field, the magnetoelastic effect of a YIG material is coupled with a standing wave thickness acoustic mode in a YIG-GGG heterostructure, and the mode combines the broadband adjustable characteristic of a magnetic resonance mode and the high-quality factor (Q value) characteristic of an acoustic resonance mode, so that the magnetoacoustic resonator simultaneously meets the broadband adjustable characteristic and the high-Q value characteristic; in the process, the YIG film plays a role of a transducer, the mode of the heterogeneous film and the microstrip line is adopted, an air gap of a magnetic circuit can be reduced, the size of a bias magnetic circuit is greatly reduced, and therefore the resonator is miniaturized.

The invention discloses an acoustic resonance assisted nano-SiO2 coated flaky carbonyl iron powder as well as a preparation method and application thereof, the flaky carbonyl iron powder is taken as a main raw material, an acoustic resonance assisted modification technology is adopted, a compact and uniform SiO2 coating layer is constructed on the surface of the flaky carbonyl iron powder, and an FCIP coated SiO2 composite material with a core-shell structure is prepared. According to the coating treatment, the oxidation resistance and corrosion resistance of the carbonyl iron powder are remarkably improved, electromagnetic parameters of the carbonyl iron powder are regulated and controlled, and particularly the wave absorbing performance of the material in a low-frequency wave band is enhanced. An electromagnetic parameter test and reflection loss calculation show that the obtained composite material has better impedance matching characteristics and lower reflection loss value. In practical application, a coated sample shows higher thermal stability and lower surface corrosion rate, and the service life of the material in a complex service environment is effectively prolonged. The method is simple and convenient in process, low in cost and suitable for being applied to functional material systems such as electric conduction, wave absorption and electromagnetic interference prevention on a large scale.