1611results about "Material analysis using sonic/ultrasonic/infrasonic waves" patented technology

The invention relates to a calibration method of an ultrasonic flaw detector calibrating device, which comprises the following steps of: acquiring and transmitting ultrasonic waves of which the frequency is matched with the theoretical frequency of a material to be detected, acquiring and dynamically correcting the actual propagation path of the ultrasonic waves in real time, generating a calibration parameter of a frequency-delay compensation coefficient, and compensating the transmitted ultrasonic waves based on the calibration parameter. After the compensated ultrasonic waves enter a to-be-detected material, time-base line signals are collected and input into the trained deviation calculation model to calculate time axis scale deviation, time-base line linearity is adjusted based on the time axis scale deviation, stepped ultrasonic attenuation signals are generated, echo signal amplitude values of the flaw detector are collected, and the amplitude values of the echo signals of the flaw detector are calculated. And comparing the echo signal amplitude value with a preset amplitude threshold value to obtain a dynamic difference value of the two, and adjusting the attenuation amount in real time based on the dynamic difference value. The problems of insufficient calibration efficiency and consistency, poor dynamic parameter adaptability, limited sensitivity calibration precision and complex working condition simulation capability in the prior art are solved.

A flow rate assembly can include a housing having a measurement channel extending along the housing axis and through a portion of the housing between the first and second ends of the housing, an outer cup portion positioned at least partly within the housing, and a transducer positioned within the outer cup portion and sealed from fluid flow past the outer cup portion, the transducer having a width perpendicular to the housing axis and greater than the width of the measurement channel, the transducer configured to generate an ultrasonic signal and to direct the ultrasonic signal through the measurement channel.

A method for locating an unknown arrangement of ultrasound transducer elements includes acquiring a set of raw ultrasound data using a flexible or rigid array of transducer elements, extracting a set of features from the ultrasound data, the features being derived from fundamental physics of ultrasound propagation and structural characteristics of a target object being imaged, organizing and structuring the extracted features as input for a machine learning model, and determining spatial coordinates of each ultrasound transducer element based on an output of the machine learning model.

The invention discloses ultrasonic gas concentration detection equipment, and relates to the technical field of gas concentration detection equipment. The transducer assembly comprises a piezoelectric unit and a metal coupling layer, the piezoelectric unit generates mechanical vibration by receiving electric signals, and the metal coupling layer is attached to the surface of the piezoelectric unit to transmit vibration to the gas medium in the cavity so as to generate ultrasonic waves; the converter assembly comprises a transmitting end and a receiving end, the transmitting end is connected with the metal coupling layer to transmit ultrasonic waves, and the receiving end receives the ultrasonic waves penetrating through the gas and converts the ultrasonic waves into electric signals; the disturbance part is suspended in the detection cavity, and the projection of the disturbance part covers an air flow path of the air inlet; the piezoelectric unit drives the disturbance part to generate first vibration in a plane of a non-parallel airflow direction, and the disturbance part generates second vibration which is non-collinear with the first vibration direction under the action of inlet airflow, so that multidirectional composite disturbance is formed, the gas concentration gradient in the cavity is broken, and the mixing uniformity is improved.

The invention discloses a lithium ion battery mixed slurry viscosity detection method based on lithium iron phosphate. The method comprises the steps of slurry pretreatment and parameter initialization, multi-modal data acquisition, dynamic viscosity compensation model construction, rheological property prediction, abnormality diagnosis and online feedback control. The temperature, the shearing rate, the solid content and the rheological curve of the slurry are acquired in real time through a multi-sensor fusion technology, a dynamic viscosity compensation model is constructed in combination with the characteristics of the lithium iron phosphate material, and a rheological prediction algorithm based on machine learning is introduced, so that high-precision and nondestructive online detection is realized. The influence of particle size distribution and temperature drift is eliminated through material characteristic modeling, and the measurement precision is further improved; and an ultrasonic wave and near infrared combined detection mode is adopted, so that the slurry structure is prevented from being damaged by a traditional sampling method, viscosity abnormity self-diagnosis and process parameter real-time feedback are realized, and the rejection rate is reduced.

The utility model provides a placement type fillet weld ultrasonic phased array detection automatic scanning device. The placement type fillet weld ultrasonic phased array detection automatic scanning device comprises a fixing plate, a detection mechanism and a fixing mechanism, notches are formed in the lower ends of the fixing plates; the detection mechanism comprises four limiting gears, a gear ring, a telescopic rod and a detection probe, the four limiting gears are rotatably connected to the fixing plate around the four corners of the notch, the gear ring is meshed with the four limiting gears, the telescopic rod is connected to the gear ring, and the detection probe is arranged at the movable end of the telescopic rod; the fixing mechanism comprises a mounting frame fixedly arranged on the fixing plate, two clamping jaws movably connected to the mounting frame, two transmission rods with one ends movably connected with the two clamping jaws in a one-to-one correspondence mode, and an electric push rod movably connected with the other ends of the two transmission rods. According to the embodiment, the detection probe is driven by the gear ring to surround the to-be-detected pipeline, so that the convenience of the device is improved. And the telescopic rod adaptively stretches out and draws back to ensure the consistency of the distance between the detection probe and the welding seam and improve the detection quality of the welding seam.

A respiratory assistance apparatus configured to provide a heated and humidified gases stream, comprising: a gases inlet configured to receive a supply of gases; a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; a gases outlet for the heated and humidified gases stream; a flow path for the gases stream through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet; a sensor assembly provided in the flow path before the humidification unit, the sensor assembly comprising an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

An unmanned aerial vehicle for non-destructive testing includes: an outer protective cage, a propulsion system mounted inside the outer protective cage and fixed thereto, an arm having a first end attached to the outer protective cage, and a non-destructive testing sensor mounted at a second end of the arm. The arm extends outward from the outer protective cage, the arm having a length between 1 and 50 percent of an overall linear dimension of the outer protective cage.

To provide a defect detecting device capable of setting a frequency appropriate for defect detection.SOLUTION: A defect detecting device (10) comprises: an input acceptance unit (161) which accepts information on a type and a size of a defect assumed to occur in an inspected object entered by a user; excitation units (11 and 12) which excite an elastic wave to the inspected object, a frequency of the elastic wave being variable; a measurement unit (15) which measures a vibrational state on a surface of the inspected object caused by the elastic wave by optical means; a wavelength determination unit (164) which calculates a wavelength of the elastic wave exited to the inspected object from the vibrational state acquired by the measurement unit; and a frequency selection unit (165) which selects an appropriate frequency from a plurality of frequencies on the basis of a wavelength acquired by the wavelength detection unit about each of the plurality of frequencies by changing a frequency of the elastic wave excited by the excitation unit and the type and size of the defect accepted by the input acceptance unit.SELECTED DRAWING: Figure 1

The invention discloses a liquid qualification detection system and method, and belongs to the technical field of intelligent detection and data analysis, multi-dimensional response signals of to-be-detected liquid under excitation of different frequencies are obtained, and a multi-dimensional response data set containing optical, acoustic, electrical and thermal physical channels is constructed; extracting a liquid component behavior characteristic spectrogram through a multi-modal characteristic fusion module; a liquid qualification judgment model is constructed based on a clustering enhanced convolutional neural network and a multi-scale attention mechanism, and classification prediction of the liquid qualification state is realized; further combining confidence coefficient calculation with historical sample database comparison, performing adaptive calibration on a prediction result, and outputting a detection result and a risk level; if the detection result is unqualified or the risk level exceeds the threshold value, an alarm mechanism is automatically triggered, and abnormal feature parameters are marked; the method has the advantages of high detection precision, high response speed, high anomaly recognition capability, excellent traceability and the like, and is suitable for scenes of liquid quality control, environment detection, biological sample analysis and the like.

The invention provides an ultrasonic detection device capable of controlling coupling strength and a method thereof, and belongs to the technical field of nondestructive testing, and the method comprises the following steps: device state and adjustment, ultrasonic sensor installation and position setting, a motor driving a screw rod to stretch out, pressure closed-loop control starting, and motor rotation control through a PID algorithm. And performing signal acquisition operation and device resetting. In the aspect of precision, the force can be accurately controlled in a specific range, the coupling strength is flexibly adjusted according to material characteristics, good acoustic coupling is formed, coupling layer interference is avoided, and the detection precision and the signal quality are greatly improved. The cost advantage is prominent, the hardware cost is greatly reduced, force is accurately controlled, probe abrasion is reduced, and the maintenance and replacement cost is reduced.

The invention belongs to the technical field of multiphase flow measurement, and relates to a bubble flow gas content ultrasonic measurement method and device based on bubble reflection, and the method comprises the following steps: measuring ultrasonic transit time tF (alpha) by using an ultrasonic transmitting and receiving probe mounted on one side of a pipeline; and based on the ultrasonic wave transit time tF (alpha) and according to a pre-calibrated relation function or relation curve of the transit time of the ultrasonic wave in the bubble flow along with the change of the gas content, the corresponding gas content alpha is calculated. According to the bubble flow gas content ultrasonic measurement method and device based on bubble reflection provided by the invention, a relation function or a relation curve that the transit time of the ultrasonic waves after being reflected by the bubbles in the bubble flow is reduced along with the increase of the gas content can be calibrated in advance by utilizing a reflection effect of the ultrasonic waves at a gas-liquid interface; in practical application, the gas content of the bubble flow can be calculated by recording the transit time of the ultrasonic waves reflected by the bubbles in the bubble flow according to the calibrated relation function or curvilinear relation.

There is provided a system and method of runtime defect detection in a semiconductor specimen. The method includes obtaining a plurality of runtime images acquired for a plurality of dies on the specimen, feeding the plurality of runtime images to a plurality of input channels of a neural network (NN) in an input order, wherein the NN is previously trained in a training phase, and processing, by the NN, the plurality of runtime images simultaneously, to obtain a plurality of defect maps, each corresponding to a respective runtime image and indicating probabilities of defect candidate presence thereof. Each given runtime image is processed as a target image using remaining images in the plurality of runtime images as reference images of the target image, and the defect map of the target image remains invariant, irrespective of changes to the input order.

The invention discloses a digital acoustic fluidic chip, a preparation method and a multi-dimensional sample processing method, the digital acoustic fluidic chip comprises an upper polar plate and a lower polar plate, and the upper polar plate comprises a glass layer, a coating layer and an upper hydrophobic layer which are arranged in sequence; the lower polar plate comprises a lower hydrophobic layer, a dielectric layer, an electrode layer and a substrate which are arranged in sequence; the electrode layer comprises an EWOD pin electrode, a driving electrode, a sound wave pin electrode and an interdigital transducer; the interdigital transducer comprises a sound field and electric field multiplexing module, a sound standing wave field and thermal field module, a focusing sound field and thermal field module and a sound vortex enrichment module; each driving electrode is connected with one EWOD pin electrode, the two sides of the sound field and electric field multiplexing module, the two sides of the sound standing wave field and thermal field module, the two sides of the focusing sound field and thermal field module and the two sides of the sound vortex enrichment module are all connected with the two sound wave pin electrodes, and one side of the sound field and electric field multiplexing module is further connected with one EWOD pin electrode. The method has the advantages of multi-dimensional sample treatment and high-flexibility treatment.

The invention aims to provide an ultrasonic transducer capable of continuously and stably working in a high-temperature and high-pressure extreme environment, and belongs to the technical field of ultrasonic nondestructive testing, the ultrasonic transducer comprises a packaging matching layer, a piezoelectric layer, an electrode layer and a backing layer, the packaging matching layer can have the effects of high temperature resistance, high pressure resistance and heat dissipation so as to match acoustic impedance, and the piezoelectric layer is arranged on the backing layer. Therefore, the acoustic performance of the transducer is improved. The piezoelectric layer can keep excellent piezoelectric performance in a high-temperature environment. The electrode layer and the back lining layer can achieve a good heat dissipation effect, and the service life is prolonged. The method has a wide application prospect in the field of ultrasonic nondestructive testing in an extreme environment.

A method for fabricating a sensor device that includes an integrated sensor assembly having a surface acoustic wave (SAW) sensor disposed on a piezoelectric substrate. The SAW sensor is adapted to measure an environmental condition of an environment in response to an RF signal. The SAW sensor includes an interdigitated transducer (IDT) formed on a substrate having at least a layer of a piezoelectric material. The SAW sensor includes either one or more SAW reflectors of a second IDT formed on the piezoelectric material. The SAW sensor further includes an RF antenna, a matching circuit and a waveguide are formed on the piezoelectric material. The SAW sensor and the RF antenna are integrated with one another on the piezoelectric material.

A flexible ultrasonic transducer is provided, which includes a reflection structure, a transducer array, a backing layer and a matching layer. The reflection structure has a concave-convex structure, and the concave-convex structure includes at least one of one or a plurality of protrusion portions and one or a plurality of recess portions. The transducer array includes a plurality of transducer elements. Each transducer element emits an ultrasonic signal such that the ultrasonic signal is incident upon at least one of the one or the plurality of protrusion portions, or at least one of the one or the plurality of recess portions. The backing layer is disposed on a first side of the transducer array, and the backing layer is between the reflection structure and the transducer array. The matching layer is disposed on a second side of the transducer array.

The invention relates to a photoacoustic gas sensor (1) comprising a substrate (2); a cover (3) which, together with the substrate (1), forms a measuring cell (4); a microphone (5) provided in the measuring cell (4); and a light source (6) provided in the measuring cell (4). The microphone (5) is provided in the measuring cell (4) such that the center of gravity (411) of the air enclosed in the measuring cell (4) and the center of gravity (521) of the microphone rear chamber (52) substantially coincide in a projection onto the substrate (1).

An inspection method is provided during which a distal end of an inspection probe is inserted into an interior of a powerplant. The inspection probe includes a body and a head pivotally connected to the body. The head includes an actuator, and the head is disposed at the distal end of the inspection probe. The powerplant includes a component within the interior of the powerplant. The head is arranged with the component. The arranging includes pivoting the head relative to the body and abutting the head against a surface of the component. Vibrations in the component are induced using the actuator. A vibratory response in the component excited by the vibrations is measured using a sensor to provide sensor data.

A method of calibrating a gas sensor comprises determining a sensitivity of a gas sensor to one or more conditions proximate the gas sensor, determining one or more initial calibration factors comprising a sensitivity of the gas sensor to one or more analytes of interest, determining a current sensitivity of the gas sensor to the one or more conditions proximate the gas sensor by measuring a response of the gas sensor while the one or more conditions proximate the gas sensor varies during operation of the gas sensor, and adjusting the one or more initial calibration factors of the gas sensor based, at least in part on the current sensitivity of the gas sensor to the one or more conditions proximate the gas sensor, and a relationship between the sensitivity of the gas sensor to the one or more analytes of interest to the sensitivity of the gas sensor to the one or more conditions proximate the gas sensor. Related gas detectors, related methods of compensating and calibrating the gas sensors, and methods of determining a functionality of the gas sensors are disclosed.

The invention discloses a method and device for measuring the center frequency of an ultrasonic longitudinal wave probe, and belongs to the technical field of ultrasonic detection. The method comprises the specific steps that an isotropic metal test block containing a specific flat-bottomed hole and a transverse through hole is manufactured, and the flat-bottomed hole and the transverse through hole are both located in a probe far-field region; by measuring the echo height (Hf) and time (tf) of a flat-bottom hole and the echo height (Hs) of a transverse through hole and combining the positions and sizes of the flat-bottom hole and the transverse through hole, the center frequency (f) of the probe is calculated based on a formula. According to the method, the sound field characteristic difference of the double reflectors is creatively used for counteracting the machining precision interference, the operation process is simplified, and the problems that a traditional method is high in equipment cost, complex in operation and limited in applicability are solved. The test block also supports multi-material adaptation (steel, aluminum, titanium alloy and the like) and is suitable for industrial sites and laboratory environments, and the detection efficiency and economical efficiency are remarkably improved.

A phased array ultrasonic testing comparison block and method for micro-defect detection of weld joints is disclosed. The comparison block comprises a first comparison block, a second comparison block, and a third comparison block used in combination. Each of the first, second, and third comparison blocks is provided with an artificial reflector. The artificial reflector comprises a transverse hole structure and a groove structure disposed on the surface of the comparison block and extending along its thickness. The transverse hole structure comprises a 0.1×6 mm transverse blind hole, a 0.5×6 mm transverse blind hole, a 0.3 mm transverse through hole, and a 0.5 mm transverse through hole. The groove structure comprises specifications of 0.5 mm width, 0.5 mm depth, and 5 mm length, 0.3 mm width, 0.3 mm depth, and 5 mm length, 0.2 mm width, 0.2 mm depth, and 5 mm length, 1 mm width, 2 mm depth, and 5 mm length, 0.5 mm width, 1 mm depth, and 5 mm length. The present invention can effectively quantify micro-defects in weld joints, achieving the purpose of quickly and intuitively assessing defect size.

The present disclosure relates to a method for detecting dirt and cleaning a surface of a camera device (10, 10'), in particular a lens system (13, 13') or a lens cover (14) of the camera device (10, 10'), with at least one piezoelectric transducer (40, 40') mechanically coupled to this surface, the method comprising the following steps: a) activating the at least one piezo transducer (40, 40') for dirt removal by vibration, and b) determining the result of the dirt removal in step a) using a mass resonance measurement method, and c.1) either repeating the sequence of steps a) and b) if the determined mass has not changed and / or discontinuing the procedure if the determined mass has fallen below a first threshold value, c.2a) or performing a method for detecting an optical blockage if the mass determined in step b) is above a second threshold value, and c.2b) if an optical blockage in the field of view of the camera device is detected in step c.2a), initiating at least one countermeasure, or, if no optical blockage in the field of view of the camera device is detected in step c.2a), discontinuing the method. It also relates to a device for carrying out this method and to a motor vehicle part comprising such a device.

The invention discloses a method for detecting and analyzing the content of liquid flavor substances in a beverage, and belongs to the technical field of beverage quality detection. The method comprises the following steps: obtaining a flavor substance dielectric response signal and a surface acoustic wave propagation signal of a beverage sample, and carrying out correlation mapping integration to form a structured original data set; preprocessing data by adopting ensemble empirical mode decomposition, integrating features through a Bayesian network multi-source data fusion algorithm, and constructing an optimized content calculation model based on a gradient boosting tree algorithm; performing time sequence consistency and dimension matching verification on the data set, and inputting the data set into a model to generate a prediction result; and extracting a related content value, carrying out deviation analysis on the related content value and a preset standard range, calculating a signal feature contribution weight, and outputting a detection report containing standard judgment and deviation traceability. According to the method, the physicochemical characteristics of the flavor substances can be comprehensively represented, accurate prediction and deviation traceability are realized, the comprehensiveness, reliability and efficiency of detection are improved, and powerful support is provided for beverage quality control.

The invention relates to the technical field of optical fiber beam guiding, and discloses a photoacoustic monitoring system based on optical fiber beam guiding, which comprises a beam modulation module, a path analysis module, a signal calibration module, an optical path optimization module, a phase management module and a regulation and control execution module. The beam modulation module sets a beam parameter interval; the path analysis module divides path nodes and generates light field distribution vectors; the signal calibration module extracts a deviation index and establishes an optical path compensation rule; the light path optimization module identifies the stability level and calculates the energy attenuation density; the phase management module derives an optimal phase threshold value and generates a phase offset sequence; and the regulation and control execution module integrates and generates a light path regulation and control execution scheme. According to the system, dynamic analysis, precise compensation and optimal regulation and control of an optical fiber transmission path are realized through cooperation of multiple modules, the precision, stability and self-adaptive regulation and control capability of photoacoustic signal monitoring are effectively improved, and the system is suitable for the fields of biomedical imaging, industrial nondestructive testing and the like.

The invention provides a bottom-sitting type seabed sediment acoustic in-situ measuring device based on an autonomous underwater vehicle, and belongs to the technical field of underwater measurement, the bottom-sitting type seabed sediment acoustic in-situ measuring device based on the autonomous underwater vehicle comprises a mounting frame, a pressure-resistant cabin, an electric cylinder and a transmitting transducer, the top of the mounting frame is used for mounting the autonomous underwater vehicle, the bottom of the mounting frame is used for mounting the measuring device, the pressure-resistant cabin is fixedly mounted at the bottom of the mounting frame and used for supplying power to the measuring device and communicating with the outside, and the electric cylinders are fixedly connected with the bottom of the mounting frame and located on the two sides of the pressure-resistant cabin. The transmitting transducer is used for receiving a signal of the pressure-resistant cabin and detecting the sediment needing to be detected when the autonomous underwater vehicle is idle, and the transmitting transducer is located at the bottom of the mounting frame, fixedly connected with the mounting frame and used for transmitting a signal; the submarine sediment acoustic in-situ measurement device and the autonomous underwater vehicle can be combined together, the size is small, and use is flexible and convenient.

Systems and methods of reconstructing photoacoustic imaging data corresponding to a brain of a subject through a skull of a subject utilizing a reconstruction method that incorporates a spatial model of one or more acoustic properties of the brain and skull of the subject derived from an adjunct imaging dataset.

Acoustic evaluation of a target may be performed using an array of electroacoustic transducers. For example, a technique for such evaluation may include generating respective acoustic transmit events using different transmit apertures, the apertures being defined by corresponding zones along the array, the zones including a plurality of electroacoustic transducer elements. In response to the respective acoustic transmit events, respective acoustic echo signals are received. Representations of the respective received acoustic echo signals are coherently summed. The coherently summing includes applying a determined nominal element delay coefficient to the respective representations to approximate a virtual probe perpendicular to a nominal shape of a surface of the inspected structure. Pixel or voxel values ​​corresponding to designated spatial locations within the inspected structure are generated using the coherently summed representations.

A sensing assembly for use in a piezoelectric liquid level sensor. The sensing assembly comprises: a first piezoelectric sensing module arranged on a magnetostrictive wire and adapted to receive an ultrasonic guided wave signal propagating along the magnetostrictive wire; a second piezoelectric sensing module arranged on the magnetostrictive wire and spaced apart from the first piezoelectric sensing module; and an isolation layer arranged on the magnetostrictive wire between the first piezoelectric sensing module and the second piezoelectric sensing module and adapted to block the ultrasonic guided wave signal from propagating to the second piezoelectric sensing module. Using the sensing assembly, the liquid level of the oil in the tank can be calculated precisely under a strong vibration noise.

The invention provides a photoacoustic pumping imaging system based on pulse laser phase energy correction. The opto-acoustic pumping imaging system based on pulse laser phase energy correction comprises a 128-channel array ultrasonic acquisition system, two OPO tunable lasers and a digital delay pulse generator which form the opto-acoustic pumping imaging system, a 128 array element linear ultrasonic transducer and a 2 * 2 multimode fiber bundle; and a pulse laser phase energy correction system which needs to monitor and correct the phase of the laser pulse. The opto-acoustic pumping imaging system based on pulse laser phase energy correction provided by the invention realizes accurate phase correction and energy normalization based on precise synchronization of two acquisition systems, so that the system can significantly reduce the fluctuation of TTD data, improve the stability and reliability of results, improve the acquisition speed and signal-to-noise ratio of the system, and improve the imaging quality of the system. The detection limit is reduced.