A method is provided to measure a distribution of axial velocities and a flowrate in a pipe or a vessel. The method comprises selecting a single cross-section at a stable-flow segment in a pipe or a vessel, installing a plurality of acoustic wave sensors along a peripheral wall of the pipe or the vessel to form a plurality of effective sound wave paths; measuring sound wave travelling time on each sound wave path; substituting the measured sound wave travelling time data into the model formulas based on a sound path refraction principle for reconstruction calculation to obtain a distribution of axial velocity in the measured cross-section of the pipe or the vessel, u(x,y); and integrating the distribution of the axial velocity u(x,y) along the cross-section to obtain a flow rate. A system is also provided to measure an axial velocity distribution and a flow rate in a pipe.

A computer-implemented method for visualizing uncertainty in flow measurements is provided. A non-limiting exemplary method includes reading, by a processor, a plurality of fluid flow measurements having a magnitude, a direction, and a location. The method plots a plurality of points on a first polar graph, each point representing the difference in fluid flow measurements between two of the plurality of fluid flow measurements at different locations and calculates an uncertainty boundary line based on the plurality of plotted points. The method filters, by the processor, the plurality of plotted points to remove plotted points outside of the uncertainty boundary line leaving only remaining plotted points and defines at least one cluster of remaining plotted points based on similar behavior of a subset of the remaining plotted points. The method may use the remaining plotted points to provide adaptive setup to tune a response in the fluid flow measurements.

The present invention is a method of determining the wind speed in the plane of a rotor (PR) of a wind turbine (1), by measuring the rotational speed of the rotor, the angle of the blades and the generated power. The method according to the invention implements a dynamic wind turbine model, a dynamic wind model and an unscented Kalman filter.

Systems and methods are provided for making in-situ measurements of the sea bed 3 component fluid velocity field and sediment motion across a range of real ocean conditions using particle image velocimetry (PIV). A PIV system in accordance with an embodiment of the present disclosure can include a camera to capture images of the particles in motion, a laser to generate a laser sheet for illuminating the particles, and a synchronizer to act as an external trigger for the laser and the camera.

A portable electronic device is operable in a particulate matter concentration mode where the portable electronic device uses a self-mixing interferometry sensor to emit a beam of coherent light from an optical resonant cavity, receive a reflection or backscatter of the beam into the optical resonant cavity, produce a self-mixing signal resulting from a reflection or backscatter of the beam of coherent light, and determine a particle velocity and/or particulate matter concentration using the self-mixing signal. The portable electronic device is also operable in an absolute distance mode where the portable electronic device determines whether or not an absolute distance determined using the self-mixing signal is outside or within a particulate sensing volume associated with the beam of coherent light. If not, the portable electronic device may determine a contamination and/or obstruction is present that may result in inaccurate particle velocity and/or particulate matter concentration determination.

In order to be able to determine with precision the location of the stagnation point at different zones along the leading edge of an aerodynamic profile, a system comprises rows of pressure sensors distributed on either side of the leading edge and forming, virtually, patterns that are spaced apart from one another in the form of simple polygonal lines, and a computer connected to the pressure sensors. The computer determines, along each of the patterns, a respective stagnation point position that is defined by a curved abscissa for which a pressure interpolated on the basis of pressure measurements provided by the pressure sensors of the corresponding row is at a maximum, and by an altitude evaluated on the basis of respective altitude data from the pressure sensors of the corresponding row.

A system operative to down a target drone having propellers deployed along a perimeter p, comprising a processor-controlled interceptor drone bearing a processor-controlled flexible elongate intercepting agent cannon and an onboard camera; and an onboard processor to receive sensed wind conditions and to a firing distance d, between interceptor and target drones, given a firing angle A, and wherein the processor is configured to track the target drone using imagery generated by the onboard camera including at least once, when said wind conditions exist, guiding the interceptor drone to a firing position whose distance from the target drone is d, and commanding the cannon to fire at firing angle A, once said firing position is achieved, thereby to use the flexible elongate intercepting agent to down target drones.

A system for imaging particles in a fluid includes a substrate holder for holding a substrate comprising a channel or reservoir for containing the fluid in the substrate, a radiation source for providing irradiation in the substrate and a radiation detection unit for detecting particles in the fluid in the substrate. At least one of the radiation source and the radiation detection unit) are configured to obtain detection in one or more distinct detection sheets in the substrate. The system further comprises an actuator configured for imparting an oscillating mechanical movement of the substrate holder regarding the radiation detection unit and the radiation source, the oscillating mechanical movement being a movement comprising a movement component in a direction perpendicular to the plane wherein the one or more detection sheets are extending.

A non-destructive monitoring method for internal pressure intensity of a pipeline. The method establishes an equation relationship by the fact that the variation of the internal diameter of the pipeline is the same as that measured by FBG sensors, and can effectively obtain the value of the internal pressure intensity of the pipeline by measuring the strain values of the FBG sensors installed on the pipeline so as to monitor the internal pressure intensity of the pipeline. The present invention has the advantages of simple principle, convenient installation, no damage to pipeline structure, long-distance real-time on-line monitoring and the like, and can measure the pressure intensity of various pipelines with different diameters by changing the calibration distance of sensors and the dimension of sensor clamps. This can complete non-destructive, real-time and accurate monitoring on the internal pressure intensity of the pipeline.

Implementations of airflow capture hoods may include a central support coupled with a plurality of ribs configured to support a bottom end of a capture hood in an open position. The central support may be coupled with a plurality of poles configured to support an upper end of a capture hood in an open position.