Precise angular position measurement of a point source in an optoelectronic system with CCD arrays upon a single readout

2015 ◽  
Author(s):  
Evgeny G. Lebedko ◽  
Elena N. Zvereva
Keyword(s):  
Point Source ◽  
Angular Position ◽  
Position Measurement ◽  
Optoelectronic System ◽  
Ccd Arrays

scholarly journals Assessment of the Accuracy of Determining the Angular Position of the Unmanned Bathymetric Surveying Vehicle Based on the Sea Horizon Image

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4644 ◽  
Author(s):  
Naus ◽  
Marchel ◽  
Szymak ◽  
Nowak
Keyword(s):  
Angular Position ◽  
Complementary Metal Oxide Semiconductor ◽  
General Concept ◽  
Oxide Semiconductor ◽  
Position Measurement ◽  
The Matrix ◽  
Horizon Line ◽  
Aerial Vehicle ◽  
Line Slope ◽  
Further Development

The paper presents the results of research on assessing the accuracy of angular position measurement relative to the sea horizon using a camera mounted on an unmanned bathymetric surveying vehicle of the Unmanned Surface Vehicle (USV) or Unmanned Aerial Vehicle (UAV) type. The first part of the article presents the essence of the problem. The rules of taking the angular position of the vehicle into account in bathymetric surveys and the general concept of the two-camera tilt compensator were described. The second part presents a mathematical description of the meters characterizing a resolution and a mean error of measurements, made on the base of the horizon line image, recorded with an optical system with a Complementary Metal-Oxide Semiconductor (CMOS) matrix. The phenomenon of the horizon line curvature in the image projected onto the matrix that appears with the increase of the camera height has been characterized. The third part contains an example of a detailed analysis of selected cameras mounted on UAVs manufactured by DJI, carried out using the proposed meters. The obtained results including measurement resolutions of a single-pixel and mean errors of the horizon line slope measurement were presented in the form of many tables and charts with extensive comments. The final part presents the general conclusions from the performed research and a proposal of directions for their further development.

Fuzzy Control of an Inverted Pendulum

1996 ◽  
Author(s):  
Tuna Balkan ◽  
Mehmet Emin Ari
Keyword(s):  
Inverted Pendulum ◽  
Fuzzy Controller ◽  
Angular Position ◽  
Upright Position ◽  
Control Signal ◽  
Position Measurement ◽  
Pendulum System ◽  
Inverted Pendulum System ◽  
And Performance ◽  
The Stability

Abstract An inverted pendulum system has been designed and constructed as a physical model of inherently unstable mechanical systems. The vertical upright position of a pendulum is controlled by changing the horizontal position of a cart to which the pendulum is hinged. The stability of the system has been investigated when a fuzzy controller is used to produce the control signal, while making a single measurement. It has been shown that by using simple fuzzy rules to allow real time computation with a single angular position measurement, the system can not be made absolutely stable. However, the stability and performance of the system have been considerably improved by shrinking the membership functions of angular position, computed angular velocity and control signal when inverted pendulum is very close to the vertical upright position.

Continuous wave Nd:YAG laser beam angular position measurement and stabilization

1995 ◽  
Author(s):  
Vadim A. Parfenov ◽  
Sergey N. Rodin ◽  
Ilya S. Etsin ◽  
Gennady F. Zajtsev ◽  
Sergey V. Kruzhalov ◽  
...  
Keyword(s):  
Laser Beam ◽  
Nd:Yag Laser ◽  
Continuous Wave ◽  
Angular Position ◽  
Position Measurement

scholarly journals A method for selfcalibration of a magneto-resistive angular position sensor in servo systems

Tehnika ◽  
2020 ◽  
Vol 75 (4) ◽  
pp. 469-476
Author(s):  
Vladimir Čeperković ◽  
Vujo Drndarević
Keyword(s):  
Measurement Error ◽  
Process Model ◽  
Least Squares Method ◽  
Angular Position ◽  
System Control ◽  
Residual Variance ◽  
Position Measurement ◽  
Internal Reference ◽  
Harmonic Compensation ◽  
Servo Systems

Magneto-resistive and Hall angular position sensors are frequently used in servo systems, due to their reliability, longevity, and tolerance to environmental conditions. In this paper, a measurement error compensation is integrated into the servo system control structure. The compensation consists of two steps: a linear compensation of the magnetic field vector measurement error, and harmonic compensation of the angular position measurement error. The selfcalibration method uses data collected during rotation with maximal speed to identify parameters of the measurement process model. Identification is executed periodically, each time when the shaft makes a full rotation. The least squares method is utilized for identification of the linear compensation parameters, while the average rotational speed is used as an internal reference for the harmonic compensation parameters identification. The method, together with a fast convergence, increases the measurement accuracy by an order of magnitude. Experimentally achieved measurement error is below 0.7°, with residual variance below 0.05°, comparable with sensor differentiability.

Laser autocollimation based on an optical frequency comb for absolute angular position measurement

2018 ◽  
Vol 54 ◽  
pp. 284-293 ◽  
Author(s):  
Yuan-Liu Chen ◽  
Yuki Shimizu ◽  
Jun Tamada ◽  
Kazuki Nakamura ◽  
Hiraku Matsukuma ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Angular Position ◽  
Optical Frequency Comb ◽  
Optical Frequency ◽  
Position Measurement

Angular position measurement of pulsars based on X-ray intensity correlation

Optik ◽  
2018 ◽  
Vol 161 ◽  
pp. 8-11 ◽  
Author(s):  
Tong Su ◽  
Yao Li ◽  
Lizhi Sheng ◽  
Pengfei Qiang ◽  
Baosheng Zhao
Keyword(s):  
Angular Position ◽  
Position Measurement ◽  
Intensity Correlation ◽  
X Ray
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