A New Precision Goniometer Mechanism for Direct Angle Measurement by a Rotary Encoder

2019 4th International Conference on Mechanical, Manufacturing, Modeling and Mechatronics;2019 4th International Conference on Design Engineering and Science

工业技术（总论）;机械制造

Anakli, Mete^1 ; Turker, Caner^1

Aselsan Inc. MGEO Division, Ankara, Turkey^1

关键词: Autocollimators;    Directly-driven;    Goniometer mechanism;    Precision positioning;    Rotary encoder;    Unit under test;    Validation test;    Virtual centers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/520/1/012008/pdf
DOI  :  10.1088/1757-899X/520/1/012008

学科分类：工业工程学

来源: IOP

【 摘 要 】

In order to perform optical tests of an optical device such as a camera, a collimator system is needed which is aligned to a precision two axes rotary system (gimbal) where the optical device (Unit Under Test, UUT) is mounted. By the help of gimbal system, precision positioning of the UUT can be achieved and optical tests can be performed with a high accuracy. However, it is hard to position elevation axis accurately for relatively heavier UUT because of direct moment applied by UUT to the elevation axis of the gimbal system. Therefore, directly driven elevation axis is replaced by a goniometer system. Due to gear coupling clearance in goniometer systems, precision positioning is not achievable. In order to overcome this problem, a new mechanism, which is driven by a power screw, is used for the goniometer and virtual center of rotation is moved within the goniometer for direct angle measurement by a rotary encoder. Validation test is performed by autocollimator and precise mirror calibrators to check the accuracy of the new goniometer system.