| Title |
High-Accuracy Small Roll Angle Measurement Method Based on Dual-Grating Diffraction Heterodyne Interferometer |
| Authors |
- S. Tang, M. Li, H. Liang, W.F. Sheng, J. Yang
IHEP, Beijing, People's Republic of China
|
| Abstract |
Small roll angle (ROLL) is an crucial parameter for the motion performances of ultra-precision guide way often applied in fine mechanics and instruments of synchrotron radiation, such as long trace profiler (LTP). However, it is difficult to be measured by conventional methods including interferometer and autocollimator owing to their low sensitivities in axial direction. There is an orthogonal dilemma between measured direction and angular displacement plane for ROLL measurement. Therefore, a novel method based on dual-grating diffraction heterodyne interferometer is presented, which uses the combining scheme of diffraction grating and heterodyne interferometer to overcome the orthogonal problem. Moreover, the design of differential structure with dual-grating and grating interferometer instead of pure interferometer, is adopted to improve the practicability against the environment, e. g. air fluctuation, inconstant rotation center. It has inherited advantages of high-resolution up to 2nrad, high sampling rate up to 50kHz, and contactless by mathematical modeling and analysis. So, theoretcial and experimental verifications are both implemented to its validation.
|
| Funding |
The work is supported by National Natural Science Foundation of China, NSFC (Grant No. 61505213). |
| Paper |
download WEOAMA03.PDF [0.767 MB / 5 pages] |
| Slides |
download WEOAMA03_TALK.PDF [2.304 MB] |
| Export |
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| Conference |
MEDSI2018, Paris, France |
| Series |
Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation (10th) |
| Proceedings |
Link to full MEDSI2018 Proccedings |
| Session |
Precision Mechanics |
| Date |
27-Jun-18 14:10–16:40 |
| Main Classification |
Precision mechanics |
| Sub Classification |
Mechatronics |
| Keywords |
laser, GUI, experiment, real-time, radiation |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editors |
Volker RW Schaa (GSI, Darmstadt, Germany); Keihan Tavakoli (SOLEIL, Gif-sur-Yvette, France); Manuel Tilmont (SOLEIL, Gif-sur-Yvette, France) |
| ISBN |
978-3-95450-207-3 |
| Published |
December 2018 |
| Copyright |
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