Angle Detection System Research Articles

Development and Application of a Body Joint Angle Detection System for Free-Throw Shooting Prediction and Posture Correction

The success rate of free-throw shooting is often a critical factor in determining game outcomes. This study employs machine learning to develop a low-cost, hardware-free joint angle measurement system for free-throw shooting and applies it to the scientific training of free-throw shooting skills. With the system, the joint angle curves of players can be measured without the need for reflective markers, thereby reducing setup costs and facilitating the integration of scientific training. This study presents several innovative features. The experimental results indicate that the amount of training data required for modeling is 50% of that required by the J48 decision tree classifier, with an accuracy 1.2 times higher. Additionally, when a shot is missed, the system compares the disparity in joint angles and provides feedback for posture correction, allowing players to target specific problem areas for training, improve free-throw performance, and assist the team in winning games.

Development of an angle detection system for channeling implantation to the c-axis of SiC using birefringence phenomenon

We developed an angle detection system for channeling ion implantation in 4H-SiC using the birefringence phenomenon. Our optical method detects the c-axis direction in 4H-SiC due to its uniaxial optical properties. The system, consisting of a laser, polarizer, gonio stage, and analyzer, is simple and cost-effective. We conducted experiments on both on-axis and off-axis 4H-SiC (0001) samples, presenting angular dependence results around the [1–100] and [11–20] rotations. Despite the need for consideration of light incident angles, the performance was comparable to Rutherford backscattering spectrometry. These findings suggest the potential application of our system in channeling implantation to the c-axis of 4H-SiC.

A new angle detection method based on the compound parabolic collector (CPC): Design and simulation

Imaging optics play a crucial role in the angle measurement system. However, the field of view (FOV) is inversely proportional to the focal length in the optical imaging system, meaning that the detection distance and FOV cannot be considered simultaneously. This paper presents a non-imaging angle detection system incorporating an optical model using a compound paraboloid collector (CPC) and data processing based on a backpropagation (BP) neural network. This method has a detection capability of 200 km, with the FOV of azimuth and pitch angles being 60°. The angle detection resolution is 1°, while the angle error is less than 0.1°. A detector array absorbs the far-field light reflected by the CPC. Changing the pitch and azimuth angles establishes the nonlinear relationship between the number of rays each detector receives and the angle. Then, a BP neural network is used to train the nonlinear relationship into a linear one. Based on the light flux data on the detector array, the simulation results show that the system can effectively predict the angle.

Development of the real-time winding angle measurement device for the laboratory-scale 3-axis winding machine

It is well-known that an automatic system can reduce errors to a great extent, which increases productivity and reduces labor costs. The existing filament winding machines or equipment lack the winding angle detection or measurement system, which cannot provide high precision and stable winding angle. This paper proposes a real-time winding angle device that can detect and measure the fiber orientation of filament wound composite products. The real-time winding angle measurement system consists of an Arducam 5MP OV5647 camera and OpenCV software. It is developed as the programming function for processing the real-time image of the winding angle. Furthermore, the traveled movement slider and the winding angle measurement image can be acquired during the dry/wet process. The laboratory-scale 3-axis winding machine integrated with the real-time winding angle measurement device is successfully developed, assembled, and tested.

Angle detection system for crossing compression of retinal artery and vein

The crossing compression of retinal artery and vein is closely related to retinal vein occlusion, so detecting the contraction angle of the crossed vein blood vessel can assist to diagnose the retinal vein occlusion diseases. Through pretreating methods such as filtering, enhancement and edge extraction, the binary edge images can be extracted. The candidate feature points can be obtained by the corner point detection method based on chord-to-point distance accumulation (CPDA). The self-adaptive rectangular filter is used to screen out the crossing point of candidate angle, so as to fit the edge curves and figure out the contraction degree of vein. The experimental results show that this algorithm can better detect the contraction degree of crossed vein blood vessel, with an average error remaining at ± 1∘ under different resolutions.

Probing proton halo effects in the 8B+64Zn collision around the Coulomb barrier

Proton halo effects in the 8B+64Zn reaction at an energy around 1.5 times the Coulomb barrier have been studied at HIE-ISOLDE CERN using, for the first time, the only existing postaccelerated 8B beam. This, together with the use of a high granularity and large solid angle detection system, allowed for a careful mapping of the elastic angular distribution, especially in the Coulomb-nuclear interference region. Contrary to what is observed for the one-neutron halo nucleus 11Be on the same target in a similar energy range, the analysis of the elastic scattering angular distribution shows only a modest suppression of the Coulomb-nuclear interference peak, with no remarkable enhancement of the total reaction cross-section. Inclusive angular and energy distributions of 7Be produced in direct reaction processes have also been measured. The comparison of these data with the results of theoretical calculations for the elastic and non-elastic breakup contributions indicate that both processes are important. Overall, the experimental data suggest a 8B collision dynamics at the barrier very different from the one of neutron halo nuclei, showing only modest effects of coupling to continuum. This behaviour can be interpreted as due to the presence of the additional Coulomb interactions halo-core and halo-target together with the presence of the centrifugal barrier felt by the valence proton of 8B.

Method for Measuring Rotation Angle of Faucet Handle Based on Machine Vision

The faucet's quality inspection is an integral component of the faucet production process. Sensitivity is an essential parameter to be considered in the detection process. In the traditional sensitivity measurement method, the angle of the rotating handle is reflected by the angle of the motor rotation. However, the motor's axis and the faucet's axis are not the same, so the angle measured by the motor is not the angle of the handle. There is a large error through the mechanical transmission structure to drive the handle movement, no matter the adopted transmission method. This article proposes a faucet rotation angle detection system that uses machine vision to measure the faucet handle's rotation angle. Experiments show that the system's measurement error is less than ±0.5° and meets the system's error requirements for the rotation angle of the faucet handle when the camera's installation height is within a specific range.

1P2-9 Position and angle detection system using photo-acoustic transmitter for catheter devices

1P2-9 Position and angle detection system using photo-acoustic transmitter for catheter devices

A Wire Angle Detection System of 2-DOF Gantry Crane Robot

Generally a crane robot and a load are connected by a flexible wire. The load swings simultaneously when the crane robot runs because of its inertia. So it is difficult for us to realize high accurate trajectory tracking of a crane robot. In order to achieve automation and high security of crane robot operation, we should get the accurate data for lifting wire. Thus it is necessary to design a wire angle detection system of 2-DOF gantry crane robot which is simple, low cost, good for real-time processing, suitable for both indoor and outdoor uses and feasible for the accurate data for lifting wire simultaneously.

452 超音波画像処理を用いた筋・腱活動のリアルタイム計測へのアプローチ

Recently the ultrasound image has been available on the research for activity of muscles and tendons. If a real time analysis system of muscles and tendons become possible, we consider that this system is able to develop effective sport training methods and so on. However, currently real-time ultrasound image is only recorded with a video, and the construction of a real time measurement system for activity of muscles and tendons has never been developed. We propose the development of a pennation angle detection system using a general image processing technique. And this proposal system can realize to detect pennation angle. We verify that the application can detect pennation angle in real-time.

“DELF”, a large solid angle detection system for heavy fragments

To detect the heavy fragments ( Z > 8) emitted at large angle (30° < θ < 150°) in heavy ion collisions at GANIL, a large solid angle detection system has been built. It consists of 18 independent cells surrounding the target, the beam axis being the revolution axis. In each cell, a fragment penetrates at first into a parallel plate avalanche counter with localization which gives velocity, position and ∂E ∂x measurements and then into an ionization chamber with longitudinal field for the residual energy measurement. The Z evaluation is performed over a large range of velocities (0.05 < E A < 5 MeV/u) for atomic numbers ranging from 8 to 90.

Reciprocity calibration of transducers in a plane wave resonator

The recently published expression for transducer calibration in a plane wave resonator by the reciprocity method [I. Rudnick, J. Acoust. Soc. Am. 63, 1923 (1978)] has been tested against a Rayleigh disk. The resonator tube was terminated at one end by a dual electret transducer and at the other end by an electro‐dynamic transducer. All three transducers were reversible allowing three independent reciprocating calibrations which agreed to better than 1% (0.1 dB). The deflection of the disk was measured by monitoring the change in inductance of a coil surrounding the resonator and the disk. The disk angle detection system was self‐calibrating and permitted absolute measurement of the flow velocity in the vicinity of the disk when the moment of inertia of the disk and damping coil were known. [Research supported by the F. V. Hunt Postdoctoral Fellowship of the Acoustical Society of America with funds provided by the Office of Naval Research.]