68results about "Full-field flow measurement" patented technology

Nitric-oxide ionization induced flow tagging and imaging (NiiFTI) is described. In one embodiment a method for characterizing a flow of a gas containing an agent includes ionizing the agent by a source of pulsed light emitting at a frequency overlapping a resonant transition frequency of the agent. In response to ionizing of the agent, a fluorescence of the gas is generated. The method also includes capturing at least one time-delayed image of the flow of the gas, where the capturing is time-delayed with respect to a pulse of the source of pulsed light. The method includes determining at least one property of the flow of the gas by analyzing the at least one time-delayed image of the flow.

The invention relates to the technical field of flow field measurement, in particular to an ocean flow field measurement method and device, and provides the following scheme: the method comprises the following steps: collecting ocean environment parameters through a vertical sensor, determining an overlook angle of an inclination sensor based on an optimization algorithm, and generating a virtual Doppler measurement array through micro-amplitude scanning; inputting to a chaotic oscillator network to identify a Lyapunov exponent maximum direction, and determining a horizontal included angle of a second inclination sensor; furthermore, a frequency shift signal is collected, and the flow velocity and the flow direction are calculated by combining adjusting parameters, so that high-precision and high-adaptability flow field measurement is realized; the method has a dynamic response capability, and is suitable for direction structure identification and real-time flow direction calculation under complex sea conditions.

A wind estimation apparatus includes an acquisition unit and an estimation unit. The acquisition unit acquires a target image of a target region. The estimation unit estimates at least one of a direction and strength of wind in the target region by using the target image.

This invention discloses a multi-scale time-frequency analysis method and system for ocean current meter signal processing, relating to the field of marine information processing. The method includes: S1: acquiring raw data and performing physical benchmark correction to obtain three-dimensional current velocity data and basic mass labels; S2: extracting first and second features from the three-dimensional current velocity data through spatiotemporal decoupling; S3: fusing and separating the three-dimensional current velocity data based on the first and second features to obtain an optimized set of flow field parameters, and generating the uncertainty of each parameter by combining the basic mass labels and error source information; S4: performing comprehensive quality assessment and grading based on the first and second features and the uncertainty, outputting a data product with mass labels and uncertainty information. By extracting spatiotemporal dual-dimensional features and using them to guide signal fusion and quality assessment, highly robust processing of ocean current data and end-to-end quality traceability are achieved, significantly improving the reliability of the data product.

The present invention relates to a method, a system and a computer program for determining the flow of a tracer in a measurement space, said method comprising the following steps: a) injecting a tracer into the measurement space at a first injection region using a tracer seeding device configured to inject the tracer into an adjustable injection region within the measurement space; b) recording the measurement space with two or more event cameras, each event camera comprising a plurality of sensors configured to generate output data each time a change in light intensity is sensed by the sensor of the event camera, the output data including information about the location of the sensor that sensed the change in light intensity and the time of the change in light intensity; c) determining, from the event camera data, with a processor, trajectories in measurement space for at least some of the injected tracers, wherein each trajectory includes information about the time-resolved three-dimensional position of at least the tracer, and the determination of the trajectories is facilitated in real time; d) adjusting the implantation area to at least a second implantation area while performing steps b) and c).

A wind flow sensing system for determining turbulence of wind flow at different elevation sets above terrain is provided. The wind flow sensing system includes an input interface configured to receive, for a set of time steps, a set of measurements of radial velocity at a site line point above terrain for each elevation, and a processor configured to estimate a velocity field for each elevation based on data assimilation of the velocity field, estimate an unbiased horizontal velocity at each elevation for each time step, determine a mean of the unbiased horizontal velocity for a time period including the set of time steps, and determine turbulence based on the unbiased horizontal velocity for each time step and the mean of the unbiased horizontal velocity.

The invention belongs to the field of marine environment monitoring, and particularly relates to a method for synchronously measuring the drifting speed of floating objects on the sea surface and the flow speed of ocean currents on the peripheral surface layer, which comprises the following steps: manufacturing a drifting buoy, and enabling the drifting buoy to vertically float on the sea surface and be completely submerged in water through a steel bar counterweight; releasing the drifting buoy to a target position through the unmanned aerial vehicle; tracking and shooting drifting buoys and sea surface floating objects, and acquiring and storing image data containing positions of the drifting buoys and the sea surface floating objects; converting the relative positions of the pixels of the image data acquired by the unmanned aerial vehicle into latitude and longitude coordinates, and generating a TIFF file; after the unmanned aerial vehicle image of the TIFF file is subjected to geometric correction, the corrected TIFF file is transmitted to QGIS software, the drifting buoy position and the sea surface floating object position are marked, and the imaging moment is synchronously recorded; and calculating the sea surface floater drift speed and the peripheral surface ocean current flow velocity based on the position change at the adjacent moments. According to the scheme, the sea surface flow velocity of the near area of the sea surface floating object can be accurately measured, and the depth of the measured surface flow velocity is determined.

The application discloses a marine shipborne wind measuring device and a wind measuring method, which comprises a left fixing plate arranged on the left edge of the upper surface of the deck of a ship body, a right fixing plate arranged on the right edge of the upper surface of the deck of the ship body, two connecting mechanisms arranged on the left fixing plate and the right fixing plate respectively, a left vertical rod limiting sleeve and a right vertical rod limiting sleeve connected with the two connecting mechanisms respectively, a left square vertical rod and a right square vertical rod in sliding connection with the left vertical rod limiting sleeve and the right vertical rod limiting sleeve respectively, and a left counterweight and a right counterweight arranged at the lower ends of the left square vertical rod and the right square vertical rod respectively. The application has the characteristics of effectively reducing the influence of the space movement of the ship body on the wind measuring device, high measuring accuracy and good measuring stability.

The invention provides an urban wind speed monitoring and assimilation method and system based on tree swing features. The system comprises an image acquisition module, an image processing and feature extraction module, a model training and storage module, a wind speed inversion module, a data assimilation module and a data storage and visualization module. Comprising the following steps: deploying a camera in a target area; collecting a tree image sequence by using a camera; extracting swing characteristic parameters of different tree species based on the tree image sequence; constructing swing-wind speed mapping models of different tree species based on the swing characteristic parameters of different tree species and tree attributes; inverting urban wind speed distribution based on the swing-wind speed mapping model; and assimilating the wind speed distribution into an urban wind field mode. The method has the advantages that urban-scale refined wind speed monitoring is achieved through existing camera resources, the spatial-temporal resolution of wind speed data is improved, and powerful support is provided for urban meteorological service, disaster prevention and reduction and the like.

The invention relates to a method for testing the function of a system (1). According to the invention, real models (7, 8) of details of a virtual 3D model (39) of the system are created, the spatial position and orientation of said real models being captured by a 3D measuring device (11) during the function testing, wherein said determined orientations and positions can be used to manipulate virtual objects (3, 4) in the 3D model (39) in order to display a visual impression (20) in a virtual reality of handling or manipulating the real models (7, 8).

The application relates to a quality control method for wind data in L-band high-altitude meteorological detection, which comprises the following steps: acquiring wind data, wherein the wind data comprises time data, height data, elevation angle data, slant range data and azimuth angle data; performing quality inspection on the height data, marking the height data as abnormal or normal; repairing the height data marked as abnormal; dividing the elevation angle data, the slant range data and the azimuth angle data into several segments according to the height, respectively determining the quality inspection standards of the segment data; performing quality inspection on the elevation angle data, the slant range data and the azimuth angle data according to the quality inspection standards, marking the elevation angle data, the slant range data and the azimuth angle data as abnormal or normal; repairing the elevation angle data, the slant range data and the azimuth angle data marked as abnormal; and outputting the quality inspection result and the repair result of the wind data.

Grids representing predictions of wind vectors (or velocities) over a ground region are obtained from a model and downscaled to a greater level of resolution based on surface roughness metrics of the ground region. Observations of wind vectors over the ground region are determined from ground-based or airborne systems and assimilated into the grids. Subsequently, grids representing the assimilated wind vectors at an initial time, and the predictions of wind vectors at future times, are provided as inputs to a machine learning model, such as a gradient-boosted decision trees algorithm, along with the surface roughness metrics and other relevant features. A continuous representation of predicted wind vectors over the ground region generated based on outputs received from the model is utilized to make operational decisions regarding an aerial vehicle.

The invention discloses a wind resource assessment method and system based on an optimized energy mode factor. According to the method, data preprocessing, parameter estimation, model verification and final evaluation are integrated into a standardized and repeatable process, so that the consistency and reliability of evaluation results are ensured; an energy mode factor directly related to wind energy is introduced to serve as a core target, a trustworthy region broken line algorithm is adopted to optimize parameter solution for solving, and it is ensured that the finally obtained Weibull parameter can reflect the energy characteristics of wind most truly instead of just the statistical distribution form of the wind speed; due to the improvement of the Weibull parameter estimation precision, the average wind energy power density calculated on the basis of the distribution model is closer to a true value, scientific support can be provided for wind power plant site selection, fan type selection and wind energy potential evaluation, and fine development of wind power projects is promoted.

A method and a system for obtaining fluid flow directions of a tundish water model are provided, and the method includes the following steps: building the tundish water model with a preset similarity ratio with a tundish prototype; carrying out an ink diffusion experiment in the tundish water model, and shooting a video of an ink diffusion process; carrying out a binarization processing on the video of the ink diffusion process frame by frame to obtain binarized images; obtaining a time grayscale map based on grayscale values of the binarized images; obtaining a velocity vector map of the tundish water model based on grayscale gradients of the time grayscale map; and obtaining a moving direction of the ink based on the velocity vector map, and obtaining a flowing direction of fluid in the tundish water model based on the moving direction.

Aspects of this disclosure are directed to optical probes for collecting images of a region of interest for determining wall shear stress. The optical probe includes an imager with a line of sight and a light guide configured to steer light from a light source to the region of interest. The optical probe includes an objective configured to focus light reflected off of the region of interest to the line of sight of the imager. The optical probe can include a micro-lens array at the objective. The micro-lens array can focus light from the objective onto the imager. The imager can collect images from the light from the micro-lens array for determining wall shear stress at the region of interest.

This invention provides a deep learning-based method for cavitation flow synchrotron radiation particle image velocimetry, comprising: capturing high spatiotemporal resolution cavitation X-ray images containing tracer particles using synchrotron radiation pulsed X-ray rapid imaging technology; improving the YOLOv5 target detection model by adding a small target detection module and a CBAM attention mechanism module; performing super-resolution preprocessing on the cavitation X-ray images using a diffusion model and segmenting the preprocessed images into four equal parts; training the improved YOLOv5 target detection model using a dataset; predicting tracer particles in the segmented images using the trained YOLOv5 target detection model to generate cavitation tracer particle images; and applying cross-correlation analysis to the cavitation tracer particle images to calculate the instantaneous velocity vector field of cavitation. This method solves the detection challenges of large numbers of small tracer particles, significant overlap between particles, and some particles being obscured by bubbles.

The invention relates to the technical field of water level monitoring of water conservancy projects, in particular to a water level monitoring device and method for a water conservancy project. The water level monitoring device for the water conservancy project comprises a mounting base, a measuring cylinder, a measuring assembly, an anti-collision plate, a cleaning ring and a cleaning assembly, stand columns are symmetrically mounted at the top of the mounting base, mounting rods are mounted at the top ends of the stand columns, radar water level gauges are mounted at the ends of the mounting rods, and the measuring cylinder is arranged on one side of the mounting base; according to the water level monitoring device for the water conservancy project and the monitoring method, through the design of the anti-collision plates, dual protection of active protection and buffering unloading is achieved, the first motor drives the anti-collision plates on the two sides to be rapidly gathered to form an isosceles triangle, sundries are effectively blocked in front of the measuring cylinder, and the sundries are prevented from directly impacting the outer wall of the measuring cylinder; when sundries collide with the anti-collision plate, the sliding rod shrinks towards the interior of the mounting cylinder and compresses the spring, instantaneous impact force is converted into elastic potential energy of the spring, and deformation of the anti-collision plate caused by rigid collision is avoided.

In a method for functional testing of equipment (1), it is proposed to create a real-world model (7,8) from the details of a virtual 3D model (39) of the equipment, and to detect its spatial position and posture during functional testing using a 3D measuring device (11). The identified posture and position can be used to make virtual objects (3,4) of the 3D model (39) follow the operations in the real-world model (7,8) in a visual impression (20) in virtual reality.

The invention relates to the technical field of aquatic organism investigation, and discloses an aquatic organism diversity investigation device which comprises an anti-sinking floating plate, a sampling cavity is formed in the bottom of the anti-sinking floating plate, a sampling mechanism is arranged at the bottom of the sampling cavity, a trigger mechanism is arranged above the sampling cavity, and the trigger mechanism starts the sampling mechanism for sampling. A driving rod drives a sampling unit and a shearing unit to synchronously move downwards, then under the rotation of the driving rod, the sampling unit conveys aquatic plants and other organisms at the water bottom into a sampling cavity, the sampling cavity is gradually filled with a cavity, and the driving rod is provided with a flow speed detection sensor. The flow speed detection sensor detects that the flow speed is reduced, the rotating speed of the driving rod is controlled to be increased, and when the sampling cavity is full and the speed of the driving rod is increased to a certain degree, the shearing unit cuts off plants such as aquatic plants, so that the situation that the device is dragged and wound by the plants such as the aquatic plants, and collection of the device is affected is avoided.

Aspects of this disclosure are directed to optical probes for collecting images of a region of interest for determining wall shear stress. The optical probe includes an imager with a line of sight and a light guide configured to steer light from a light source to the region of interest. The optical probe includes an objective configured to focus light reflected off of the region of interest to the line of sight of the imager. The optical probe can include a micro-lens array at the objective. The micro-lens array can focus light from the objective onto the imager. The imager can collect images from the light from the micro-lens array for determining wall shear stress at the region of interest.

The application discloses a stirring process pressure measuring device and method, and relates to the technical field of pressure measurement.The device comprises an experimental cylinder body, a digital acquisition instrument and a computer, wherein the experimental cylinder body comprises a stirring barrel main body and a pressure conduction cavity which are separated by a partition plate, and the bottom of the pressure conduction cavity is further connected with a pressure transmitter for measuring the pressure of a set measuring hole; the digital acquisition instrument is connected with the pressure transmitter and is used for collecting the pressure of multiple measuring holes; the computer is connected with the digital acquisition instrument and is used for calculating the flow rate of the pressure of the stirring process according to the pressure of each measuring hole, and drawing the pressure field distribution and the velocity field distribution in the stirring barrel main body based on the calculation result.The application can collect pressure signals by means of the cylinder side wall and the bottom transmitter, and realize the pressure measurement at any position in a three-dimensional space.

Embodiments of the present application disclose a wind speed information determination method and device. When determining wind speed information, roughness information corresponding to a target region can be acquired first. The roughness information can identify roughnesses corresponding to respective sub-regions. A processing device can analyze a representative roughness corresponding to the target region. The representative roughness is the roughness corresponding to the sub-region with the largest number of sub-regions. Therefore, the representative roughness can accurately reflect the roughness of the target region. Based on this, the processing device can update the roughness of a boundary sub-region corresponding to a plurality of sub-regions to the representative roughness. The boundary sub-region is located at a boundary position of the target region, so that the roughness of the boundary sub-region can be relatively uniform. The processing device can determine wind speed information corresponding to the target region according to the updated roughnesses of the plurality of sub-regions, so as to avoid the problem that the wind speed information is inaccurate due to a sudden change in the roughness of the boundary region.

A real-time reference free background oriented schlieren system is provided. One embodiment includes a display device capable of generating an image pattern projected onto a retroreflective background. A beam splitter is used to transmit a portion of the projected image pattern towards a reference image sensor and another portion of the image pattern towards the retroreflective background and past a density object. The retroreflective background reflects the projected pattern back through the beam splitter and onto a signal imaging sensor. Collected data from the reference image sensor and the signal image sensor may be processed in real-time. The image pattern may be altered as necessary without requiring a new reference image, reducing the amount of time required to set up and adjust the system. A display device may be capable of switching between a schlieren visualization capability to a shadowgraph system allowing for the use of two different imaging techniques.

The invention relates to the technical field of flow measurement, and discloses a flow measuring device and method suitable for small ditches, comprising a device body, the top of the device body is connected with a water pumping device, the lower part of the water pumping device is connected with a speed measuring tube, the side of the device body is connected with a laser range finder, and one side of the front of the device body is provided with scales. The speed measuring tube is clamped beside the scale of the device body, and the tail end of the speed measuring tube is bent towards the scale direction. Compared with a propeller / rotating cup type flow meter which is widely used at present, the device is a flow measurement tool developed according to the hydraulic Bernoulli principle, the structure is simple, no complex mechanical and electronic structure exists, the manufacturing and later maintenance cost is reduced, the flow velocity and the water channel section can be measured at the same time through the device, the field flow measurement efficiency is improved, and the device is suitable for popularization and application. The flow measurement duration is shortened, and the flow measurement timeliness is ensured.

This invention relates to the field of water flow velocity measurement technology, and particularly to a method and system for dynamic state estimation of electronic buoys in water flow velocity measurement. The method employs BeiDou dual-frequency RTK positioning technology to obtain the observation position of the electronic buoy; it uses the universal transverse Mercator projection method to convert the longitude and latitude of the reference point into east and north distance coordinates, which serve as the origin of the electronic buoy observation coordinate system; it then converts the subsequently acquired electronic buoy observation position into east and north distance information, and performs difference calculations with the origin of the electronic buoy observation coordinate system to obtain the east and north distance offsets of the electronic buoy, which are used as measurement information; a dynamic state estimation model for the electronic buoy is constructed; and the measurement information is used as input parameters for a UKF filtering algorithm to perform real-time estimation of the electronic buoy's motion state. This invention directly processes the nonlinear characteristics of electronic buoy motion and water flow disturbances through a nonlinear Kalman filtering algorithm, significantly improving the accuracy and stability of state estimations such as velocity and heading angle.

A system and method for calculating a flight plan and a precision release point for an aircraft carrying a payload includes supplying, from a four-dimensional (4D) wind measurement system, 4D wind data indicative of atmospheric wind velocity and direction (i) at and within a first threshold distance around a current flight level of the aircraft, (ii) at and within a second threshold distance around a drop zone for the payload, and (iii) at and within a third threshold distance around a plurality of different altitudes. The 4D wind data is continuously sampled, in a processing system, and is iteratively processes, in the processing system, to calculate, using a release point model implemented in the processing system, a flight plan for the aircraft and a precision release point for the payload.

The invention relates to the technical field of soil detection, in particular to visual soil health level detection equipment which comprises a base, a surrounding plate is fixedly connected to the periphery of the top of the base, and a sliding column is slidably mounted at the center of one end of the surrounding plate. According to the invention, the equipment is constructed at the farmland, so that the equipment can play a role similar to a base station, in the prior art, the residence of a grower is generally far away from the farmland and cannot pay attention to the situation in the farmland at any time, and the farmland can be detected in real time through the camera, the wind speed detection sensor and the probe; and monitored data can be transmitted to a mobile phone of a farmer through the radar antenna, so that the farmer can remotely monitor the states of crops and soil in a field, and then visual real-time monitoring is realized.

The invention discloses an online VOCs gas leakage intelligent monitoring system and method. The method comprises the following steps: S1, carrying out data acquisition by using a distributed sensing network; s2, data processing is carried out through an intelligent edge calculation module; s3, performing calibration by using a dynamic baseline calibration technology; s4, eliminating interference by means of an anti-interference enhancement design; and S5, mapping a 3D gas concentration field in real time through a digital twin platform, and predicting a leakage diffusion range in future preset time. According to the online VOCs gas leakage intelligent monitoring system and method disclosed by the invention, VOCs gas leakage is efficiently and accurately monitored, a leakage source is quickly positioned, a diffusion path is predicted, powerful support is provided for taking countermeasures in time, and personnel health and environmental safety are guaranteed.

This invention discloses a flow field measurement device and method for an annular combustion chamber, comprising: an intake system including an intake structure for connecting to the head of the annular combustion chamber, the intake structure having intake channels matching the number and circumferential position of the head of the annular combustion chamber; a tracer particle generator for injecting tracer particles into one or more intake channels to obtain a target tracer particle concentration in a target measurement area; an exhaust system including an exhaust structure for connecting to the tail end of the outer casing of the annular combustion chamber, the exhaust structure guiding the exhaust gas from the annular combustion chamber out; and a PIV measurement system for emitting sheet-like lasers into the interior of the annular combustion chamber at one or more preset circumferential positions and measuring the flow field within the annular combustion chamber.

A method for testing the function of a system (1). In the method, real models (7, 8) of details of a virtual 3D model (39) of the system are created, with the spatial position and orientation of these real models being captured by a 3D measuring device (11) during the function testing. The determined orientations and positions can be used to manipulate virtual objects (3, 4) in the 3D model (39) in order to display a visual impression (20) in a virtual reality of handling or manipulating the real models (7, 8).