49 results about "Doppler flow" patented technology

The invention discloses an acoustic Doppler flow velocity measurement method and system, and the method comprises the steps: generating an emission parameter combination adaptive to a current hydrological environment according to the depth characteristics and precision requirements of a target water area; original echo signals are collected based on the emission parameter combination, and a three-dimensional flow velocity vector of temperature compensation is output; inputting the three-dimensional flow velocity vector into the dynamic segmentation network to generate a layered flow velocity distribution model; calling a layered flow velocity distribution model, fusing fluxgate compass azimuth data to carry out flow direction compensation, triggering a deviation correction algorithm when equipment inclination exceeds a limit, and outputting absolute flow velocity distribution of pose calibration; and according to absolute flow velocity distribution and echo intensity dynamic range constraint, calculating an error interval of each depth unit, and outputting a final flow velocity profile with confidence identification. According to the embodiment of the invention, the environmental adaptability and data reliability of flow velocity measurement can be improved.

The invention provides a three-dimensional multi-dimensional oceanic nekton monitoring method based on artificial intelligence, and relates to the technical field of oceanic nekton monitoring, and the method comprises the steps: deploying a temperature-salinity-depth section plotter and an acoustic Doppler flow velocity section plotter, collecting data, configuring an environment parameter data set, obtaining a three-dimensional environment parameter data set, and obtaining a three-dimensional environment parameter data set; and a multi-dimensional environment parameter database is generated. Various ocean fishery resource investigation means are fused, an advanced artificial intelligence method is applied, three-dimensional multi-dimensional dynamic monitoring of the ocean swimming animals is achieved, on one hand, the number composition and space-time distribution of the ocean swimming animals, especially the vertical distribution characteristics can be monitored, the population dynamics of the ocean swimming animals and the relation between the population dynamics and environmental factors can be revealed, and on the other hand, the population dynamics of the ocean swimming animals can be monitored. By monitoring the swimming animals, basic data can be provided for population resource evaluation, and the method serves formulation of fishing quota of ocean economic swimming animals, delimitation of ocean protection areas and the like.

The invention particularly discloses a fractured rock mass grouting three-dimensional visualization test device and method, and relates to the technical field of rock mass engineering. The device comprises a test box body, a liquid inlet and outlet system, a monitoring system and a dynamic water environment simulation assembly, the test box body is made of a transparent acrylic material and is composed of an upper cover plate, a lower cover plate, a front cover plate, a rear cover plate, a baffle and two side cover plates, and a core experiment module is arranged in the test box body; the liquid inlet and outlet system is sequentially connected with the liquid holding device, the peristaltic pump, the valve, the Doppler flow velocity sensor and the test box body through rubber pipes; the monitoring system integrates an image collection unit and a data monitoring unit, an industrial-grade 3D camera and a binocular camera achieve visualization of the displacement process, and a fiber bragg grating pressure sensor synchronously collects fracture pressure data and transmits the fracture pressure data to a computer through a multifunctional data collection module. The device can be used for observing the displacement process of the slurry in the three-dimensional fracture in real time, synchronously monitoring key parameters, adapting to complex test working conditions and providing reliable support for grouting law research.

The invention discloses a Doppler blood flow velocity estimation method based on high-frequency pulse differential frequency, and solves the problems of velocity estimation resolution reduction and artifacts caused by alternate transmission of a B mode and Doppler pulses in an ultrasonic dual-mode system. The method comprises the following steps: transmitting a high-frequency broadband ultrasonic signal compatible with B-mode imaging; the method comprises the following steps: receiving a superficial blood vessel echo signal, performing time domain sampling, converting into a discrete signal, extracting a narrow-band frequency spectrum through frequency sampling, and generating a low-frequency equivalent signal by using a multi-frequency-point differential frequency technology; calculating a covariance matrix of each signal, performing average weighting to remove artifacts, and generating low-frequency equivalent covariance data; and estimating the blood flow velocity through eigenvalue decomposition and spectral peak search. According to the method, two pulses do not need to be transmitted alternately, resolution reduction and artifacts are avoided, Doppler velocity estimation precision is remarkably improved, integrated waveform design is supported, and hardware implementation is simplified.

The invention belongs to the technical field of hydrodynamics, and relates to a subsurface flow accurate measurement method and system based on an acoustic Doppler flow velocity profiler. The method comprises the following steps: measuring a target water area by using an acoustic Doppler current profiler; extracting at least one boundary feature parameter at the measurement point; constructing a physical-data fusion model and carrying out pre-training; inputting effective flow velocity data located above the measurement blind area in the original data of the flow velocity profile and the boundary characteristic parameters into a pre-trained physical-data fusion model; and outputting the subsurface flow velocity distribution in the measurement blind area and the key statistic and confidence interval of the subsurface flow velocity distribution. According to the method, the respective defects of an existing physical model and an existing data driving model can be overcome, a subsurface flow accurate measurement method integrating physical interpretability and environment adaptability is provided, a traceable and verifiable model training and evaluation benchmark is provided, and the subsurface flow measurement accuracy in a complex environment is remarkably improved.

The invention relates to a blood flow parameter measuring device, equipment, a storage medium, an ultrasonic probe and a system, and belongs to the field of medical instruments. The blood flow parameter measuring device comprises a first obtaining module used for obtaining a first measuring parameter obtained by a first transducer group in an imaging mode; the second acquisition module is used for acquiring a second measurement parameter acquired by the second transducer group in the imaging mode or the Doppler blood flow detection mode; the first measurement parameter and the second measurement parameter both comprise a blood vessel position, a blood vessel depth, a blood vessel diameter and a Doppler included angle; the correction module is used for performing combined calculation on the first measurement parameter and the second measurement parameter and correcting the blood vessel diameter and the Doppler included angle; and the monitoring module is used for monitoring hemodynamic parameters of the target object according to the corrected blood vessel diameter and Doppler included angle. According to the technical scheme, the stable hemodynamics evaluation result can be output.

The utility model discloses an acoustic Doppler flow velocity measuring device which comprises a lifting support, a chain guide rail is arranged on the lifting support, and a chain used for pulling a measuring mechanism is arranged in the chain guide rail. The first lifting mechanism comprises a driving part which is provided with an output shaft, a winding drum is arranged on the output shaft, and a steel wire for pulling the measuring mechanism to lift is wound on the winding drum; the second lifting mechanism comprises an arc-shaped guide rail, an arc-shaped groove is formed in the guide rail, and the chain can extend into the guide rail from one end of the arc-shaped groove and extend out of the guide rail from the other end of the arc-shaped groove; and the chain wheel is fixedly connected to one end of the output shaft and is meshed with the chain. According to the utility model, the first lifting mechanism and the second lifting mechanism are arranged at the same time, and when one lifting mechanism breaks down, the other lifting mechanism can be used for driving, so that the phenomenon that the measuring mechanism cannot be pulled due to the damage of the lifting mechanism is avoided.

The invention provides a muscle-bone injury area identification method and system, and relates to the technical field of muscle-bone image injury identification. The method comprises the following steps: acquiring a two-dimensional gray-scale ultrasonic image of a target muscle-bone injury area, and positioning a synovial tissue area from the two-dimensional gray-scale ultrasonic image; extracting target feature information from the synovial tissue region; and determining the inflammation activity degree of the synovial tissue according to the target feature information. According to the method, Doppler blood flow signals are completely bypassed, the rheumatism inflammation activity degree is evaluated only through rich information contained in the two-dimensional gray-scale ultrasonic image, and therefore interference of probe pressure artifacts is thoroughly avoided.

The utility model relates to the technical field of submarine mining, in particular to a multi-vehicle collaborative deep-sea mining underwater positioning navigation system and a working method, which comprises wireless communication positioning equipment, a long baseline positioning assembly, an ultra-short baseline positioning assembly, a communication cable, an inertial navigation system and a Doppler flow velocity log, the long baseline positioning assembly comprises a long baseline positioning node, a long baseline positioning terminal and a long baseline resolving unit; the ultra-short baseline positioning assembly comprises an ultra-short baseline positioning array and an ultra-short baseline positioning terminal. The underwater comprehensive positioning and navigation system can be applied to underwater comprehensive positioning and navigation of a plurality of mining vehicles, conveying hoses, relay stations and conveying vertical pipes in a commercial mining system.

The invention relates to a system and method for performing a laser Doppler flowmetry, LDF, measurement. The system comprises a coherent light source, a photodetector and one or more processors. The photodetector generates an output signal. The processor(s) determines a selected frequency range for computing an LDF signal. A spectrum of the photodetector output signal is computed for a series of time intervals, thereby obtaining a series of spectra. A measure of the amount of physiological information in the spectra is computed for a number of different frequencies. The selected frequency range is determined as the range of frequencies for which the computed measure of amount of physiological information fulfills a predetermined criterion. The processor(s) compute an LDF signal using the selected frequency range, and output the LDF signal.

The invention discloses a wading bridge cast-in-place box beam intelligent dynamic support system and a construction method, and relates to the technical field of bridge engineering, the wading bridge cast-in-place box beam intelligent dynamic support system comprises a sensor array module which comprises a plurality of sensor nodes composed of Doppler current meters, pressure type water level gauges and optical fiber strain sensors, and the sensor nodes are arranged at different positions of a support respectively; the sensor is used for monitoring data of water flow speed, water level change and support stress in real time and transmitting the collected sensor data to a remote control center in real time in a wireless communication mode; by arranging the sensor array module, the self-adaptive buoyancy module, the upstream intelligent grid, the telescopic supporting mechanism and the remote control center, the intelligent dynamic support system capable of achieving real-time monitoring and dynamic adjustment is adopted, the effect of remarkably improving the stability of the support in wading bridge cast-in-place box girder construction is achieved, and the construction risk and cost are reduced; a prediction model based on an AI algorithm is introduced.

The utility model discloses a lifting support for an acoustic Doppler flow velocity measuring device, comprising a plurality of support units, each support unit comprising a plurality of longitudinal beams and a plurality of cross beams; the first connecting pieces are connected to the outer side faces of the cross beams, the outer side faces of the longitudinal beams and the outer side face of the other adjacent cross beam at the same time. The second connecting pieces are connected to the inner side faces of the cross beams and the inner side face of another adjacent cross beam at the same time; according to the utility model, the plurality of first connecting pieces are arranged on the outer side surfaces of the cross beams and the longitudinal beams, and the second connecting pieces are arranged on the inner side surfaces of the two adjacent cross beams, so that the plurality of longitudinal beams and the plurality of cross beams are detachably assembled together. In this way, the original scheme that the lifting support is welded on site is replaced, and the problem that welding cannot be achieved due to the fact that the construction site does not have the power supply condition is solved.

The invention relates to a system and method for performing a laser Doppler flowmetry, LDF, measurement. The system comprises a coherent light source, a photodetector and one or more processors. The photodetector generates an output signal. The processor(s) determines a selected frequency range for computing an LDF signal. A spectrum of the photodetector output signal is computed for a series of time intervals, thereby obtaining a series of spectra. A measure of the amount of physiological information in the spectra is computed for a number of different frequencies. The selected frequency range is determined as the range of frequencies for which the computed measure of amount of physiological information fulfills a predetermined criterion. The processor(s) compute an LDF signal using the selected frequency range, and output the LDF signal.

1. Name of the product in this design: Ultrasonic Transcranial Doppler Blood Flow Analyzer Headframe. 2. Purpose of this design: When used in conjunction with a transcranial Doppler ultrasound blood flow analyzer, it can simultaneously fix two probes for long-term intracranial vascular blood flow monitoring. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention discloses a marine environment monitoring system based on inertial navigation, and the system comprises an inertial navigation system which is used for collecting three-dimensional attitude angle and three-dimensional linear acceleration data; the Doppler log is used for collecting moving speed data of the carrier relative to the seabed; the satellite navigation receiver is used for collecting a geographic position and a UTC time signal; and the temperature-salinity-depth instrument is used for collecting temperature, salinity and pressure data of seawater. And the acoustic Doppler flow velocity profiler is used for collecting relative velocity and direction data of water flows at different depths in a water column below the carrier. The inherent accumulated position drift error of the inertial navigation system is corrected in real time by comparing and fusing the real-time position, speed and attitude angle of the carrier provided by the inertial navigation system with the ground speed of the carrier provided by the Doppler log. And the existing residual position error is reset to zero by using the absolute geographic position, so that the problem of precision maintenance during long-endurance and long-distance operation of the carrier is thoroughly solved.

A method for monitoring renal blood flow of a patient includes positioning an ultrasound transducer probe on an abdomen of the patient. The ultrasound transducer probe includes a two-dimensional array of transducer elements. The two-dimensional array of transducer elements and a beamformer driving the two-dimensional array of transducer elements scan a volume of the abdomen of the patient under the field of view of the two-dimensional array of transducer elements. A processor in communication with the ultrasound transducer probe and the beamformer identifies a sub-volume in the volume that includes a Doppler flow signal having a signature of interest corresponding to the renal blood flow of the patient. A set of sequential beams are periodically fired from the two-dimensional array of transducer elements over the sub-volume to track the sub-volume.

The present application belongs to the technical field of anatomical hemodynamic data processing, and relates to a VTE dynamic early warning method and system based on anatomical hemodynamic coupling; the present application synchronously collects ultrasonic structure images and Doppler blood flow signals, extracts time-varying vorticity features and key anatomical constraint sets, generates an expected blood flow atlas by using a fluid dynamics simulation model, compares in real time to monitor continuous deviation events, and traces back to analyze to generate root cause candidate points; the system further constructs a dynamic risk field and a dynamic root cause field, which are updated in correlation to form a dynamic coupling field, realizing continuous and individualized tracking of the health status of blood vessels; finally, according to the dynamic coupling field situation, graded early warning data containing early warning state levels, risk visualization and traceability prompts are output; the present application improves the timeliness and diagnosis direction of early warning, and provides precise and dynamic risk assessment and decision support for clinical use.

The invention belongs to the technical field of wind turbine generator auxiliary work, and discloses an offshore wind power single pile foundation cage vibration suppression device which comprises a flow breaking plate in an equilateral rectangle shape and flow disturbing assemblies installed at the four corners of the flow breaking plate correspondingly. Through the cooperation of the flow breaking plate, the flow disturbing assembly and other structures, when one acoustic Doppler flow velocity profiler detects that the impact force of the ocean current is too large, the outer end of the flow guide plate is controlled to face the ocean current through the intelligent adjusting assembly, and the ocean current is shunted by the shunting boxes and reaches the other two shunting boxes through the notches in the flow guide plate; the guide plates II are in fixed postures and are not in the same direction as the ocean current, and the ocean current is in a disordered state and is thoroughly disturbed, so that the situation that the flow velocity is not reduced and the ocean current converges with other ocean currents to form larger-scale ocean current or eddy current is prevented, the impact of the ocean current on other cage bodies is reduced, and the service life of the cage bodies is prolonged. And the safety of the cage in other areas is further protected.

The invention discloses a self-diversion type overwater emergency rescue floating platform, and relates to the technical field of overwater emergency rescue floating platforms, the self-diversion type overwater emergency rescue floating platform comprises an overwater emergency rescue floating platform body, the top end of the overwater emergency rescue floating platform body is provided with a rescue chamber, and the top of the rescue chamber is provided with a flexible solar film. The ultrasonic wave wind speed sensor is used for measuring real-time wind speed / wind direction, the Doppler flow speed sensor is used for measuring underwater water flow speed / flow direction, and the pressure type wave height sensor is used for measuring wave height / wave frequency, so that transverse wind wave monitoring is realized under cooperation, and then data is transmitted to the main controller for analysis; an electric telescopic rod in the deformation flow guide mechanism is driven to extrude an elastic deformation plate to be gradually bent into an arc shape from an initial parallel state (the radian is increased along with the increase of the wind wave grade) according to the wind wave grade, and a rubber buffer cushion is matched to resist wind wave impact and guide the impact to be shunted from the two sides of the floating platform, so that interference of wind waves to rescue operation is reduced; the standing stability of personnel is improved.

A blood flow monitor includes an ultrasound transducer probe with a two-dimensional array of transducer elements. An adhesive patch is connected to the ultrasound transducer probe and is configured to attach the ultrasound transducer probe to a patient. The blood flow monitor also includes a system memory that stores beamformer software code. A processor is in communication with the ultrasound transducer probe and the system memory. The processor is configured to execute the beamformer software code to steer a beam to scan the patient with the array of transducer elements to find a Doppler flow signal of a targeted blood flow of the patient.

The utility model discloses a lifting mechanism for an acoustic Doppler flow velocity measuring device, which comprises a driving part provided with an output shaft on which a winding drum is arranged; the winding drum comprises a first wire winding section and a second wire winding section, a first steel wire is wound on the first wire winding section, a second steel wire is connected to the second wire winding section, and the first steel wire and the second steel wire are both connected to the measuring mechanism; wherein the winding direction of the first steel wire is opposite to that of the second steel wire; the first steel wire is connected to the top end of the measuring mechanism and is used for applying upward pulling force to the measuring mechanism; the second steel wire is connected to the bottom end of the measuring mechanism and used for applying downward pulling force to the measuring mechanism. According to the utility model, the first wire winding section winds the first steel wire and pulls the measuring mechanism upwards to rise at a constant speed; and the second wire winding section winds the second steel wire and downwards pulls the measuring mechanism to descend at a constant speed, so that the measuring mechanism ascends and descends at a constant speed.

The application discloses a data processing method of an underwater glider for obtaining a sea current profile, and belongs to the technical field of ocean exploration. The underwater glider for obtaining the sea current profile comprises a pressure-resistant unit, a tail unit and a flow velocity profile obtaining unit. The flow velocity profile obtaining unit comprises an acoustic Doppler flow velocity profiler, a current meter and a temperature-salinity-depth sensor. The underwater glider can obtain the sea current information by integrating the flow velocity sensor, but the obtained sea current information is the relative velocity relative to the moving glider platform, and is not the absolute velocity of the sea current. The application obtains the accurate sea current profile based on the motion information of the underwater glider and the flow velocity profile observation data.

A method is disclosed for monitoring organ blood flow, The method includes affixing an ultrasound transducer probe on an abdomen of a patient, The ultrasound transducer probe includes a two-dimensional array of transducer elements. The two-dimensional array of transducer elements and a beamformer driving the two-dimensional array of transducer elements scan a volume of the abdomen in an elevation dimension and in a lateral dimension. A processor in communication with the ultrasound transducer probe and the beamformer identifies in the elevation dimension and in the lateral dimension a Doppler flow signal corresponding to the organ blood flow. The two-dimensional array of transducer elements and the beamformer scan the volume in a depth dimension only at the position of the Doppler flow signal in the elevation dimension and the lateral dimension to determine a position of the Doppler flow signal in the depth dimension.

The embodiments of the present disclosure provide a method and a device for signal processing. The method includes: obtaining multiple sets of initial Doppler blood flow signals, sampling times of the multiple sets of initial Doppler blood flow signals being discontinuous; and performing a splicing processing on the multiple sets of initial Doppler blood flow signals, to obtain a target Doppler blood flow signal.

This invention belongs to the field of blood flow detection technology, specifically relating to a detection and analysis method and system for an ultrasonic Doppler blood flow detector. By configuring a pressure sensor and a coupling agent detection terminal on the ultrasonic probe, the contact pressure between the probe and the skin and the coupling agent thickness can be collected in real time during blood flow detection. Simultaneously, image quality parameters are extracted from the blood flow ultrasonic images, and the contact pressure of the probe and the amount of coupling agent used are dynamically adjusted based on these parameters, achieving precise control of the blood flow detection process and ensuring the stability and high quality of the ultrasonic images. In addition, by precisely controlling the probe contact pressure and coupling agent thickness, the effective blood flow velocity is extracted from the blood flow ultrasonic images and combined with physiological indicators to identify abnormal blood flow velocities. This operation not only ensures the quality of the ultrasonic images but also allows for further accuracy evaluation of the blood flow detection results, enabling timely detection and identification of abnormalities.

The utility model discloses a take-up mechanism for an acoustic Doppler flow velocity measuring device. The take-up mechanism comprises a rotatable take-up roller; the guide roller is parallel to the take-up roller, a first guide groove and a second guide groove are formed in the guide roller, and the first guide groove and the second guide groove are spirally formed along the peripheral wall of the guide roller; and the guide sleeve is arranged on the guide roller in a sleeving mode and can rotate relative to the guide roller, balls are arranged on the inner circumferential wall of the guide sleeve, and the balls can slide along the first guide groove and the second guide groove. According to the cable winding device, the guide sleeve can drive the cable to move in the length direction of the guide roller, so that the cable is uniformly wound on the winding roller, the cable is prevented from being stacked at the same position of the winding roller, and the cable is prevented from being broken or broken due to overlarge stress.

The utility model discloses a flow velocity monitoring device for hydraulic engineering, which belongs to the field of hydraulic engineering and comprises a Doppler flow velocity meter composed of a remote controller and a single flow velocity sensor, and a plurality of hollow measuring rods connected through pin structures are arranged on one side of the single flow velocity sensor. Compared with the prior art, the utility model has the advantages that the device indirectly drives the single flow velocity sensor welded with the convex plate to automatically move up and down along the hollow measuring rod through the threaded structure connection of the screw rod and the convex plate, thereby completing the measurement of the flow velocity under the condition that the position of the hollow measuring rod is not changed. The water flow velocities at different depths are detected, so that remote monitoring of the water flow velocities at different depths is facilitated; in order to adapt to the convenience of assembly and carrying of the multi-section hollow measuring rod, the total screw rod is also formed by splicing a plurality of sections of screw rods.

This utility model discloses a flow metering device for pipe corridors, relating to the field of pipe corridor flow metering technology. It includes a fixed plate connected to the inner wall of the corridor, a fixed ring mounted on the fixed plate, and a Doppler flow meter positioned on the fixed ring. A transmission line is located at the rear end of the Doppler flow meter and connected to a processor. A quick-release mechanism is provided between the fixed ring and the fixed plate. The quick-release mechanism includes a fixed sleeve fixedly connected to the surface of the fixed ring. By pressing a button, the button drives the guide sleeve to move, which in turn drives the guide block to move through a guide groove. The guide block drives the sliding column to rotate, and the sliding column adjusts the locking block to unlock or lock, facilitating quick installation of the fixed ring. The button is embedded in the fixed sleeve, effectively reducing direct water erosion. The use of the locking block and fixed seat for easy fixing avoids structural damage caused by water erosion and extends service life.

The ultrasonic imaging device comprises an ultrasonic probe and an operating handle, the ultrasonic probe comprises a sheathing canal, an energy converter arranged in the sheathing canal, a torsion piece at least partially located in the sheathing canal and a connecting piece connecting the torsion piece and the energy converter, and the energy converter comprises a plurality of array elements. The operating handle is connected with the torsion part and used for manually driving the torsion part to twist, and when the torsion part twists, the transducer can be driven to rotate through the connecting part. When the ultrasonic probe is used, the transducer only needs to be manually driven by the operating handle to rotate so as to find the optimal scanning direction, high-speed rotation is not needed, the ultrasonic probe can carry out Doppler imaging, especially Doppler blood flow can be observed, a doctor can carry out clinical diagnosis conveniently, and the cost of a patient can be saved.