21 results about "Ultrasound attenuation" patented technology

The invention relates to the technical field of cavitation monitoring, in particular to a tidal current energy water turbine cavitation predicting and monitoring method which comprises the steps that S1, multi-sensor data of a tidal current energy water turbine are collected, and the multi-sensor data comprise vibration signals, ultrasonic signals and pressure signals; s2, performing frequency domain analysis on the vibration signal, and extracting an energy value of a high frequency band as a vibration characteristic value; s3, performing transmission attenuation analysis on the ultrasonic signal, and calculating an ultrasonic attenuation rate as an ultrasonic characteristic value; s4, performing frequency domain analysis on the pressure signal, and extracting a pressure pulsation amplitude at a blade passing frequency as a pressure characteristic value; s5, based on the vibration characteristic value, the ultrasonic characteristic value and the pressure characteristic value, the current cavitation state is determined through a cavitation state judgment rule; and S6, predicting the evolution trend of the cavitation state, and estimating the residual safe operation time of the water turbine under the current working condition. The cavitation recognition result is converted into a quantitative life index, and the method has engineering application value and safety guarantee capability.

The utility model provides a large flue gas ultrasonic flowmeter device, which is characterized in that a detection flange opening is arranged on the pipe wall of a flue, the device comprises a first fixed cylinder, a second fixed cylinder and a third fixed cylinder, and the first fixed cylinder and the third fixed cylinder are respectively connected with the detection flange opening; the second fixing cylinder is arranged between the first fixing cylinder and the third fixing cylinder and is connected with the first fixing cylinder and the third fixing cylinder through connecting rods; the device further comprises two ultrasonic probe assemblies, one end of one ultrasonic probe assembly is connected with the first fixing cylinder, and the other end of the ultrasonic probe assembly is connected with the second fixing cylinder. One end of the other ultrasonic probe assembly is connected with the second fixing cylinder, the other end of the other ultrasonic probe assembly is connected with the third fixing cylinder, and a signal isolation plate is arranged in the second fixing cylinder. The propagation distance of ultrasonic waves between the transmitting end and the receiving end is reduced by arranging the multiple groups of ultrasonic probe assemblies, the influence of ultrasonic attenuation on ultrasonic wave receiving is weakened, and the detection precision is improved.

The application discloses a casing anisotropy measurement method based on ultrasonic Lamb waves. The application simulates by constructing an ultrasonic Lamb wave logging simulation model, respectively obtains the relationship between ultrasonic Lamb wave attenuation values, reflection amplitude values and casing corrosion degrees, then places the ultrasonic Lamb wave sound system in a preset target well section for actual measurement, obtains far and near waveform data and reflection waveform data, processes to obtain the envelope curves of the far and near waveforms and the reflection, calculates the casing corrosion degree value by using the reflection amplitude and casing corrosion degree relationship, determines the ultrasonic Lamb wave attenuation value after casing corrosion by using the ultrasonic Lamb wave attenuation value and casing corrosion degree relationship, combines the ultrasonic Lamb wave attenuation value of the casing without corrosion, determines the ultrasonic Lamb wave attenuation amount, calculates the difference value between the far and near waveform attenuation values and the ultrasonic Lamb wave attenuation amount, and obtains the real ultrasonic Lamb wave attenuation value. The application eliminates the influence of casing anisotropy on ultrasonic Lamb wave attenuation, and realizes accurate measurement of casing anisotropy.

The invention provides a method for detecting wettability of an electrolyte in a decommissioned lithium battery based on ultrasonic waves, which comprises the following steps: controlling an ultrasonic transducer module to generate ultrasonic waves, and enabling the ultrasonic waves to act on a to-be-detected decommissioned lithium battery; the ultrasonic transducer module receives a transmission time domain signal and a reflection echo signal; processing the transmission time domain signal, obtaining a transmission intensity matrix and an ultrasonic attenuation degree of each scanning point in the battery, and mapping the transmission intensity matrix and the ultrasonic attenuation degree to a preset HSV color space I to generate a first pseudo-color image; based on the flight time and the reflection intensity of the reflection echo signal, rebuilding reflection characteristic distribution of different depth layers in the battery through a tomography algorithm, generating a series of layered pseudo-color images, and further generating a three-dimensional body rendering model; and analyzing and outputting the infiltration state parameters of the electrolyte. According to the method, a transmission and reflection dual-mode ultrasonic imaging technology is creatively fused, and a chromatographic algorithm and a color mapping strategy are combined, so that nondestructive detection of the infiltration state of the electrolyte is realized.

To suppress deterioration of an acoustic transmission layer.SOLUTION: An ultrasonic probe includes a vibrator part, a contact part, and an acoustic transmission part. The transducer unit includes a plurality of transducers that transmit and receive ultrasonic waves. The contact interface is in contact with a subject. The sound transmission part is disposed between the vibrator part and the contact part and is formed to have a low attenuation rate of ultrasonic waves. The thickness of the acoustic transmission unit may be in the range of 2. 3mm to 4. 7mm, and the acoustic transmission unit may be formed using a material having an acoustic impedance of 1. 4MRayl or more and 1. 6MRayl or less.SELECTED DRAWING: Figure 2

The invention relates to the field of automatic detection of tea processing, and provides a tea withering detection method and system based on ultrasonic attenuation, and the method comprises the steps: synchronously collecting echo signals, position parameters and environment temperature, generating a stacking thickness field matrix through thermodynamic sound velocity compensation and cubic spline interpolation, and outputting porosity correction according to a rheological power law function; a transmission acoustic signal is collected by a time division multiplexing mechanism, a transmission amplitude field and a propagation time field are constructed through Hilbert transform and cross-correlation time delay estimation, average sound velocity distribution is constructed, and a physiological attenuation coefficient and a damage index are generated in combination with porosity correction; a composite feature vector is constructed, and the local water content and the cell wall breakage rate are solved through a space-time gradient coupling network; and generating a global regulation and control instruction in combination with the spatial weighted average moisture content and the accumulation thickness field matrix, and generating a fixed-point targeted raking instruction in combination with the abnormal displacement coordinates. According to the method, acoustic inversion and multi-dimensional closed-loop correction are fused, and digital perception and intelligent targeted regulation and control of the tea leaf withering process are constructed.

The application discloses a kind of based on ultrasonic wave attenuation characteristics pillar load quantitative inversion and safety diagnosis method, belong to rock engineering safety monitoring and nondestructive testing technical field.First, construct the rock sample with different fracture characteristics, carry out loading test under different load and obtain multi-band time domain signal, obtain the attenuation value under different load grade to construct the quantitative relationship model of different frequency band;Statistical pillar fracture characteristic parameters, obtain its attenuation value under each frequency band;Substitute into quantitative relationship model, carry out multi-band data fusion inversion, obtain the current equivalent load of pillar;Calculate safety factor, combined with the stability quantitative evaluation standard constructed, carry out quantitative diagnosis to target pillar stability.The application uses ultrasonic wave attenuation characteristics, improves diagnosis sensitivity and accuracy;Discard single frequency pulse, adopt sweep excitation technology can simultaneously identify the coupling mechanism of load action and fracture characteristics;Overcome the limitation of single factor, realize quantitative judgment.

A method for compensating for ultrasonic attenuation by the head and hair in a wearable ultrasound device, for controlled transcranial ultrasonic therapies that deliver into the brain deterministic ultrasound pressure and intensity, is provided. The method includes positioning a wearable ultrasonic device within degassed water, the device comprising a first ultrasonic transducer and a second ultrasonic transducer; obtaining a first signal amplitude from the device by emitting a first ultrasonic pulse from the first transducer and receiving the first pulse via the second transducer; positioning the device onto the head of a subject; obtaining a second signal amplitude from the device by emitting a second ultrasonic pulse from the first transducer and receiving the second pulse via the second transducer; and scaling an amplitude of the driving voltage of ultrasonic pulses delivered via the device based on a comparison of the first signal amplitude and the second signal amplitude.

The invention provides a sound system and an in-vehicle communication support system, which can suppress the disadvantage of ultrasonic radiation through a parametric speaker and increase the reproduction level of audible sound. Ultrasonic waves, which have been amplitude-modulated with audible sound emitted from a parametric speaker (1), are incident on an audible sound collector (2) with high directivity. The audible sound collector (2) attenuates incident ultrasonic waves and ultrasonic waves in audible sound self-demodulated from the ultrasonic waves, reflects the audible sound, and collects sound at a position in the vicinity of a user. The audible sound collector (2) can be configured from a reflector (21) having a reflecting surface that is a paraboloid of revolution and a sound absorber (22) that absorbs sound of ultrasonic waves, and the sound absorber (22) can be configured using an inverter tube (221) and a sound absorbing material using a photonic crystal.

The present invention relates to a resin composition for attenuating the sound of ultrasonic waves, the composition having excellent heat resistance and ultrasonic attenuation properties.

The invention discloses an ultrasonic metering module and an ultrasonic gas meter, and belongs to the technical field of gas metering, the ultrasonic metering module comprises a shell and a transducer, a metering flow channel extending in the first direction is arranged in the shell, and the shell comprises a first inner wall and a second inner wall which are oppositely arranged in the second direction. The energy converter comprises a first energy converter and a second energy converter, the first energy converter is arranged on one side of the first inner wall in the shell, and the second energy converter is arranged on one side of the second inner wall in the shell. The incidence angle of the transducer is A, the unit is degree, the width of the metering flow channel in the second direction is H, the unit is mm, and A =-1.23 * H2 + 44.7 * H-a; wherein a is greater than or equal to 370 and less than or equal to 374.5 According to the ultrasonic metering module provided by the invention, the effective sonic path distance of ultrasonic waves and the attenuation condition of the ultrasonic waves can be balanced while the overall size is reduced, the measurement sensitivity and stability of the ultrasonic metering module are ensured, and the measurement precision is improved.

A drug applicator for a system for ultrasound-enhanced delivery of at least one drug to a target site in a intraocular space, the system comprising a signal generating unit operationally connected to an ultrasound transducer, wherein the drug applicator comprises at least one space hold the drug, is made from a low ultrasound attenuation material, is configured to provide low ultrasound loss coupling of the system to the sclera, and is configured to be mechanically coupled to the system and further configured to be coupled to the ultrasound transducer with low ultrasound loss. The signal generating unit and / or the ultrasound transducer are configured to emit an ultrasound wave form in at least one application cycle, the application cycle comprising at least one ultrasound emitting event with a time duration TA and a waiting period with a time duration TW.

Based on at least one of a degree of variation in brightness values of pixels or a representative brightness value of frame data for evaluation range decision for each region defined in a data space of frame data, each region is classified into a region that is included in an evaluation range and a region that is not included in the evaluation range. An attenuation amount estimation unit estimates an attenuation amount of ultrasound waves in a subject based on a frequency spectrum of reception beam data of each region included in the evaluation range among a plurality of regions arranged in a depth direction, the region being defined in a data space of the reception beam data and corresponding to each region defined in the data space of the frame data. An image formation unit executes TGC processing as brightness correction processing based on the attenuation amount of the ultrasound waves estimated by the attenuation amount estimation unit.

The application discloses a kind of based on ultrasonic wave attenuation characteristics pillar load quantitative inversion and safety diagnosis method, belong to rock engineering safety monitoring and nondestructive testing technical field.First, construct the rock sample with different fracture characteristics, carry out loading test under different load and obtain multi-band time domain signal, obtain the attenuation value under different load grade to construct the quantitative relationship model of different frequency band;Statistical pillar fracture characteristic parameters, obtain its attenuation value under each frequency band;Substitute into quantitative relationship model, carry out multi-band data fusion inversion, obtain the current equivalent load of pillar;Calculate safety factor, combined with the stability quantitative evaluation standard constructed, carry out quantitative diagnosis to target pillar stability.The application uses ultrasonic wave attenuation characteristics, improves diagnosis sensitivity and accuracy;Discard single frequency pulse, adopt sweep excitation technology can simultaneously identify the coupling mechanism of load action and fracture characteristics;Overcome the limitation of single factor, realize quantitative judgment.

A transducer attenuator assembly comprising: an enclosure defining an acoustic chamber coupled to a sound output port of a transducer that is operable to generate audible frequencies from ultrasonic frequencies; and a plurality of openings formed through the enclosure to acoustically couple the acoustic chamber to a surrounding ambient environment, and the plurality of openings are arranged to attenuate an ultrasonic sound wave and leak an audible sound wave output by the transducer to the acoustic chamber.

This invention provides an ultrasonic testing device and method for the porosity of resin-based fiber-reinforced composite materials. First, an ultrasonic probe is used to test a comparison test block. The test data is linearly fitted to establish a relationship between the ultrasonic attenuation rate α and the porosity φ. Then, the ultrasonic probe is used to test the workpiece to obtain its attenuation rate α. Finally, based on the aforementioned relationship and the attenuation rate α, the porosity of the workpiece is obtained. This application can perform regional, in-situ porosity testing on the workpiece, effectively detecting the porosity of different parts of large workpieces. It solves the problem in traditional testing methods where local sampling cannot characterize overall non-uniformity, achieving comprehensive testing of integrally molded large-scale structural fiber composite materials.

The invention discloses a method, a system, equipment and a medium for detecting the concentration of oil mist in air by combining ultrasonic attenuation with optical refractive index, and relates to the field of detection of the concentration of oil mist in air, comprising the following steps: synchronously exciting an acoustic signal and an optical signal in a detection cavity; the method comprises the following steps: acquiring a sound wave signal to obtain corresponding sound wave attenuation information, and detecting an interference light path to obtain corresponding interference fringe offset information; respectively calculating corresponding acoustic characteristic parameters and optical characteristic parameters based on the sound wave attenuation information and the interference fringe offset information; obtaining a concentration parameter based on the acoustic characteristic parameter, the optical characteristic parameter, the environment temperature parameter and the environment humidity parameter; a residual error is calculated and judged, and when the residual error exceeds a preset threshold value, the intelligent compensation model is called to correct the concentration parameter. According to the invention, when the residual error is abnormal, the intelligent compensation model is introduced to correct the result, and the problem that a single sensing mode is easily influenced by particle size distribution and environmental change is avoided.

A kind of copper tube grain size detection method based on ultrasonic attenuation, establish detection model, model detection and data acquisition, ultrasonic probe excites the original wave of frequency f m , and the time series signal of original wave is collected;Determine detection scheme: determine the parameter in model, obtain experimental data, extract experimental data, calculate amplitude attenuation coefficient, establish the functional relationship between grain size and amplitude attenuation coefficient, solve the function of grain size and amplitude attenuation coefficient by fitting;Obtain the functional relationship z=f (α) between grain size z and amplitude attenuation coefficient α, the advantages of the present application are: accurately deduced the functional relationship between the sound pressure attenuation coefficient of ultrasonic detection copper tube and the grain size of copper tube. The difference multi-learning step method is used to solve the functional relationship between the sound pressure attenuation coefficient and the grain size of copper tube, which greatly improves the solving efficiency. Real-time control strategy of learning step is adopted, which avoids the divergence of solving process caused by random selection of learning step.

The invention relates to ultrasonic attenuation for a transducer. A transducer attenuator assembly includes a housing defining an acoustic cavity coupled to a sound output port of a transducer operable to generate an audible frequency from an ultrasonic frequency; and a plurality of openings formed through the housing to acoustically couple the acoustic cavity to an ambient environment, and arranged to attenuate ultrasonic waves and leak audible acoustic waves output by the transducer to the acoustic cavity.

A drug applicator for a system for ultrasound-enhanced delivery of at least one drug to a target site in a intraocular space, the system comprising a signal generating unit operationally connected to an ultrasound transducer, wherein the drug applicator comprises at least one space hold the drug, is made from a low ultrasound attenuation material, is configured to provide low ultrasound loss coupling of the system to the sclera, and is configured to be mechanically coupled to the system and further configured to be coupled to the ultrasound transducer with low ultrasound loss. The signal generating unit and / or the ultrasound transducer are configured to emit an ultrasound wave form in at least one application cycle, the application cycle comprising at least one ultrasound emitting event with a time duration TA and a waiting period with a time duration TW.

The invention relates to the technical field of ultrasonic radar dynamic anti-interference scheme design based on environment coupling analysis, in particular to an ultrasonic radar dynamic anti-interference method and system based on environment coupling analysis. Comprising the following steps: establishing a machine learning mapping model of rain fog / sand dust environmental parameters and ultrasonic attenuation; environmental parameters are sensed in real time through multi-sensor fusion; based on the output of the mapping model, dynamically adjusting the transmitting power and the frequency band by adopting a feedback control algorithm; the model weight is optimized in combination with an online learning mechanism; adding an energy consumption constraint control power threshold value; adaptive filtering is performed on a received signal. The method breaks through the limitation of a traditional fixed compensation strategy, realizes real-time optimal matching of environmental parameters and radar working parameters, and effectively inhibits signal attenuation interference caused by weather. The system has the characteristics of high robustness and low energy consumption, and the detection precision and reliability of the ultrasonic radar under all-weather working conditions are remarkably improved.