Optical choppers with spherical shafts: an optomechanical analysis

Eduard-Sebastian Csukas; Virgil-Florin Duma

doi:10.1117/12.2516364

11 April 2019 Optical choppers with spherical shafts: an optomechanical analysis

Eduard-Sebastian Csukas, Virgil-Florin Duma

Proceedings Volume 11028, Optical Sensors 2019; 1102805 (2019) https://doi.org/10.1117/12.2516364
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

Choppers are widely used in optical sensing, including for radiometry and photometry, spectrometry, biomedical applications, and telescopes. While classical choppers are built with rotational disk, we have introduced and patented a novel device, with rotational shafts, which has the capability to surpass the maximum limit of around 10 kHz chopping frequency that characterizes choppers with disks. The main issue of such choppers with shafts comes from the high rotational speeds they can employ. This is an advantage in terms of the high chopping frequency they can produce, but it imposes the necessity to perform a Finite Element Analysis (FEA) of the fast rotational shafts. While in previous studies we approached cylindrical shafts for the chopper, in the present one we consider spherical shafts. Optical aspects of such devices – regarding the transmission functions produced – have been presented in previous studies. In the present one we focus on the FEA of these choppers. Different dimensions and a range of rotational speeds of up to 60 krpm are considered. The main working conditions that are imposed are the structural integrity and the acceptable level of (elastic) deformations of the chopper shafts. Limits of the rotational speed at which the choppers can (still) work are discussed from these two points of view – with regard to the characteristics of the device.

Citation Download Citation

Eduard-Sebastian Csukas and Virgil-Florin Duma "Optical choppers with spherical shafts: an optomechanical analysis", Proc. SPIE 11028, Optical Sensors 2019, 1102805 (11 April 2019); https://doi.org/10.1117/12.2516364

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