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Duan Dang

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Proceedings Article | 27 November 2023 Poster + Paper

Analysis of autocollimator measurement system based on quaternion algorithm for 6-DOF

Dinh Duan Dang, Igor Konyakhin, Renpu Li, Han Xiao

Proceedings Volume 12769, 127691D (2023) https://doi.org/10.1117/12.2687310

KEYWORDS: Autocollimators, Matrices, Light emitting diodes, Reflectors, Reflection, Motion measurement, Image processing, Control systems, Computing systems, Video

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The measurement of the six degrees of freedom (6-DOF) is crucial in industrial manufacturing, enabling efficient operation of machinery. The combination of 6-DOF and the quaternion coordinate system offers a robust framework for accurately representing and controlling the motion and orientation of objects in 3D space. Electro-optical measurement systems are commonly used in these cases due to their advantages such as compact design, fast measurement speed, high stability, and accuracy, as well as the ability to directly measure displacement parameters of the object. The proposed autocollimator optic-electronic system is designed to provide accurate measurements of the position and motion coordinates of industrial objects. It consists of an autocollimator, reflector, radiation marks, lenses, CMOS matrix photoreceivers, and a computer for calculations. By combining the equations related to the quaternion coordinates, reflected images, and image distances, a system of equations is formed to determine the six motion coordinates of the object. The proposed autocollimator optic-electronic system offers a practical solution for accurate measurement of industrial objects' motion coordinates, optimizing both accuracy and efficiency. It can be applied in various applications where precise measurements are required. The autocollimator measuring system outperforms the three-point optic-electronic system in terms of measurement accuracy for all six coordinates encompassing rotational motion and linear displacement. The autocollimator system offers higher precision, particularly in linear displacements, angular rotation, and rotational axis position.

Proceedings Article | 19 December 2022 Poster + Paper

Autocollimator for measuring three angular and three linear deformations of industrial structures

Ding Duan Dang, Igor Konyakhin, Renpu Li, Han Xiao

Proceedings Volume 12319, 123191L (2022) https://doi.org/10.1117/12.2643763

KEYWORDS: Reflectors, Light emitting diodes, Autocollimators, Receivers, Sensors, Control systems, Chemical elements, Optical components, Mirrors, Industry

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Nowadays, linear displacement and angle measuring devices are widely used in the assembly, calibration and deformation monitoring of industrial structures. The Optic-electronic autocollimators for non-contact measurements are highly effective in these cases, since the measurement has a large measuring distance and high accuracy, but the existing autocollimation sensor for measuring angular and linear coordinates consists of two separate measuring systems and two reflectors, respectively. This disadvantage is a major obstacle for determining 6 motion coordinates at a point of the object. Autocollimator is suggested, capable of determining 6 object motion parameters (3 3 rotation angles and 3 linear displacements). The two main components of the autocollimator are the special reflector at the track point of the monitored object and radiating-receiver unit at the rigid base. A specially constructed tetrahedral prism is used as a reflector. Two emission marks are placed directly in front of the radiation receiver objective. Each emission mark after reflecting through the faces of the reflector produces 6 images, so with two emission marks 12 images are produced behind the reflector. The displacement of the object is calculated from the coordinates of the images obtained on the sensor. Mathematical models that determine the displacement of the object based on the image coordinates on the matrix photo receiver have been built. A comparative analysis between the optic-electronic autocollimators and the existing schemes was performed by computer simulation. The simulation results show that the proposed scheme has a smaller error. In addition, the simple and compact structure is also one of their outstanding advantages.

Proceedings Article | 20 June 2021 Poster + Paper

Optic-electronic autocollimation system for measuring line and angular deformation

Dinh Duan Dang, Igor Konyakhin

Proceedings Volume 11782, 1178225 (2021) https://doi.org/10.1117/12.2592734

KEYWORDS: Reflectors, Autocollimators, Autocollimation, Prisms, Optoelectronics, Metrology, Mathematical modeling, Error analysis, Reflector design, Optoelectronic devices

Read Abstract +

The improved autocollimator for measuring angular and shift deformations of the large constructions as mirrors of the rotatable radiotelescopes are analyzed. Two types of the measuring scheme for autocollimator are researched. The first type of the autocollimator scheme uses three cube-corner reflectors which are set in 3 points of the counter reflector of the radiotelescope. This type of the autocollimator measures the angular and line shifts in a large range. The counter reflector is set on the SEMS moving platform and the range of its line and angular shifts is 3 arc degree and 100 mm respectively. The second type of autocollimator scheme uses a tetrahedral reflector. This autocollimator is used for the measuring pitch and yaw angular deviations and line shifts of the section boards of the main mirror of the radiotelescope. The range of section board line and angular shifts is 30 arc minutes and 10 mm respectively. The changing one measuring scheme to another is made by switching the radiation marks of the autocollimator. The technical characteristics of the suggested autocollimator and algorithms of measuring line and angular shifts are discussed.

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