12 results about "Spin axis" patented technology

Embodiments are disclosed for determining a spin rate and axis of a ball using deep learning. In some embodiments, a method comprises: training a deep learning network on training images of spinning balls, each spinning ball having at least one feature point in a time series that forms a two-dimensional (2D) ellipse image in a 2D plane; capturing, with at least one camera, a series of images of a ball; predicting, with the trained deep learning network, spin measurements associated with the ball based on the series of images; determining a spin rate of the ball based on the spin measurements; determining coefficients of a 2D ellipse model based on the spin measurements and the spin rate; and determining, with the at least one processor, a spin axis of the ball in 3D space based on the 2D ellipse model and the spin rate.

A spinnable disk spatial filter for a confocal microscope comprises a plurality of semi-annular sections, each semi-annular section shaped to define a corresponding section pinhole group comprising a plurality of pinholes arranged in a lattice pattern, each pinhole permitting transmission of light through the disk. For each semi-annular section, the corresponding section pinhole group is located to have a corresponding section offset along a section offset direction orthogonal to the spinning axis and having at least a component that extends radially from the spinning axis. The section offset is different for at least two of the plurality of semi-annular sections.

An optically pumped magnetometer includes a cell, a pump light incidence unit causing pump light to be incident on a sensitivity region inside the cell in a first direction, a probe light incidence unit causing probe light for detecting change in electron spins to be incident on the sensitivity region in a direction intersecting the first direction, a bias magnetic field coil applying a bias magnetic field in the first direction to the inside of the cell and determining a resonance frequency of the electron spins, a gradient correction coil correcting a gradient of the bias magnetic field, an electron spin tilting unit tilting a rotation axis direction of the electron spins, an optical sensor detecting the probe light having passed through the sensitivity region, and a magnetic field measuring unit measuring a magnetic field strength related to the sensitivity region based on an output of the optical sensor.

The invention provides an optical excitation magnetic sensor and a brain magnetic instrument. The optical excitation magnetic sensor includes: a unit; a pump light incidence section that causes pump light to enter a plurality of sensitivity regions inside the cell in a first direction; a probe light incidence unit that causes probe light to enter the plurality of sensitivity regions in a direction intersecting the first direction; a bias magnetic field coil that applies a bias magnetic field to the inside of the cell to determine the resonance frequency of the electron spin; an electron spin tilting unit that tilts the rotation axis direction of electron spin; a light sensor for detecting the probe light that has passed through the sensitivity region; and a magnetic field measurement unit that measures the magnetic field intensity of the sensitivity regions, and the bias magnetic field coil applies a plurality of bias magnetic fields having mutually different intensities to each of the plurality of sensitivity regions.

The invention relates to a device for detecting a rotational property of an object rotating about an axis of rotation, comprising: a magnet (1) rotatably mounted about the axis of rotation (10) with a cylindrical circumferential wall (11) surrounding the axis of rotation (10), wherein a magnetic north pole (N) and a magnetic south pole (S) of the magnet (1) are diametrically opposed with respect to the axis of rotation (10), a magnetic field-sensitive sensor device (2) configured to detect the magnetic field of the magnet (1) during rotation of the magnet, and an evaluation circuit (3) which calculates the rotational property from the detected magnetic field. To eliminate an external magnetic interference field, it is proposed that the magnetic field-sensitive sensor device (2) has two sensor elements (21; 22), each capable of detecting a magnetic field component (B). x1 ; B x2) in an x-direction as well as the detection of a magnetic field component (B y1 ; B y2 ) in a y-direction, wherein the evaluation circuit (3) is configured to determine a first difference value (ΔB x ) from the magnetic field components (B) detected by the two sensor elements (21, 22) in the x-direction x1 , B x2 ) and a second difference value (ΔB y ) from the magnetic field components (B) detected by the two sensor elements (21, 22) in the y-direction y1 , B y2 to calculate.

Methods and apparatus, including computer program products, implementing, and using techniques for determining a spin axis of a ball in flight. At least a portion of an observed trajectory of the ball is obtained. The trajectory includes three-dimensional locations of the ball over time, as determined from individual observations of the ball by one or more sensors. A point in three-dimensional space is selected. An optimization problem is solved, wherein the three-dimensional acceleration at the selected point is used as an optimization target, and a spin axis, a spin magnitude and a wind vector are used as optimization parameters, and wherein the solution to the optimization problem is a combination of optimization parameter values. The spin axis determined in the solution to the optimization problem is selected as the spin axis for the ball. The spin axis is used to generate ball trajectory information for presentation on an output device.

The embodiment of the application discloses a kind of ring sweep imaging satellite's rotation control method, device and medium;The method can include: according to the kinematics equation constructed by (w,z) parameter and the dynamics equation constructed by rigid model, the reference value w of parameter w for describing spin axis pointing is obtained by time integration r ;Rotation stage: without introducing the parameter z for describing the rotation angle around spin axis, the parameter w obtained by the first reference value w r Parameter error w e And angular velocity error ω e First control law is designed for rotation control, and is switched to spin angle control stage after rotation stabilizes;Spin angle control stage: the value of parameter z at switching time is used as the initial value of the reference value z r Of parameter z, and according to the kinematics equation constructed by (w,z) parameter and the dynamics equation constructed by rigid model, subsequent reference value z r Is obtained by time integration;According to the reference value z r Of the parameter z, the error z e Of parameter z is introduced, and the second control law for spin angle control is designed according to the error z e Of the parameter z and the first control law.

Angle measuring device (10) for measuring a rotation of a test element (12) over a measuring range that covers more than one full rotation of the test element (12), - with a magnetic element (14) that generates a magnetic field, - with a magnetic field sensor (20) arranged in such a way as to be close to the magnetic element (14) that the magnetic field sensor (20) can measure the magnetic field generated by the magnetic element (14), and - with a coupling device (22) that couples the rotation of the test element (12) with a movement of the magnetic element (14), - wherein the magnetic field sensor (20) is a 2D magnetic field sensor capable of measuring a two-dimensional magnetic field vector, or a 3D magnetic field sensor capable of measuring at least a three-dimensional magnetic field vector, and - wherein the coupling device (22) is designed such that the magnetic element (14) performs a rotation about a magnetic element rotation axis (18) and a translation in the direction of the magnetic element rotation axis (18) relative to the magnetic field sensor (20) when the test element (12) is rotated about a test element axis (16), - wherein the rotation angle measuring device (10) has an evaluation device (40) which is designed in such a way that it can determine and determine a rotation angle of the magnetic element (14) about the magnetic element rotation axis (18) from the measured values ​​of the magnetic field sensor (20), - wherein the evaluation device (40) is designed such that it can determine and determine an axial position of the magnetic element (14) along the magnetic element rotation axis (18) from the measured values ​​of the magnetic field sensor (20), at least within the measuring range, and - wherein the evaluation device (40) is designed such that it can determine the axial position of the magnetic element (14) from a direction of the measured magnetic field vector and determines, - wherein the magnetic element (14) is not rotationally symmetrical with respect to the magnetic element rotation axis (18), characterized in that - the magnetic element (14) has a smaller radial extent at the axial ends (68) of the magnetic element (14) than in a region (66) between the axial ends (68) of the magnetic element (14).

A spin calculation method for a golf ball moving by being hit according to an embodiment of the present invention comprises: acquiring a first image and a second image, which are consecutive images for the golf ball with a plurality of markers to be hit and moved, respectively; processing to obtain information on a reference marker and a plurality of peripheral markers around the reference marker for a plurality of markers on a first ball image corresponding to a golf ball in the first image; specifying a combination of markers corresponding to the reference marker and the peripheral markers on the first ball image among markers in a second ball image corresponding to a golf ball in a second image; and processing to calculate a spin axis and a spin amount of the moving golf ball using each center point of a pair of markers corresponding to each other on the first ball image and the second ball image.

Embodiments are disclosed for determining a spin rate and axis of a ball using deep learning. In some embodiments, a method comprises: training a deep learning network on training images of spinning balls, each spinning ball having at least one feature point in a time series that forms a two-dimensional (2D) ellipse image in a 2D plane; capturing, with at least one camera, a series of images of a ball; predicting, with the trained deep learning network, spin measurements associated with the ball based on the series of images; determining a spin rate of the ball based on the spin measurements; determining coefficients of a 2D ellipse model based on the spin measurements and the spin rate; and determining, with the at least one processor, a spin axis of the ball in 3D space based on the 2D ellipse model and the spin rate.

The purpose of the present invention is to provide a method for measuring spin information of a ball hit and moved. When a ball used in sports such as golf is hit and moved while rotating, a reflected Doppler signal of a radar signal is received, and digital data of the received signal is acquired and analyzed. Accordingly, the spin axis of the moving ball is calculated in a new manner that cannot be predicted by conventional technology, thereby improving the accuracy of spin axis calculation.

A system can include a spinning structure configured to spin in operation, and at least one mass operatively connected to spinning structure to rotate about a spin axis with the spinning structure. The at least one mass can be configured to be moved relative to the spinning structure during a spin of the spinning structure. The system can include an actuation system configured to move the at least one mass relative to the spinning structure. The actuation system can be configured to move the at least one mass while the spinning structure is spinning to use the spin of the spinning structure to induce a precession torque on the spinning structure. The actuation system can be configured to synchronize actuation motion of the at least one mass to the spin of the spinning structure such that the induced precession torque is in a desired direction.