Journal
OPTICS EXPRESS
Volume 27, Issue 11, Pages 15518-15527Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.015518
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Funding
- National Natural Science Foundation of China (NSFC) [11834001]
- National Postdoctoral Program for Innovative Talents of China [BX20190036]
- China Postdoctoral Science Foundation [2019M650015]
- Graduate Technological Innovation Project of Beijing Institute of Technology [2018CX10020]
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The angular acceleration of a spinning object can be estimated by probing the object with Laguerre-Gauss (LG) beams and analyzing the rotational Doppler frequency shift of returned signals The frequency shift is time dependent because of the change of the rotational angular velocity over time. The detection systein is built to collect the beating signals of LG beams back-scattered from a non-uniform spinning body. Then a time-frequency analysis method is proposed to study the evolution of the angular velocity in time. The experimental results of different angular accelerations of the rotator are consistent with expectations. The measurement errors of different probe beams with various topological charges from l = +/- 10 to l = +/- 100 are also investigated. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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