Optical choppers with cylindrical rotational shafts for laser applications: a Finite Element Analysis

Eduard-Sebastian Csukas; Virgil-Florin Duma

doi:10.1117/12.2318308

25 September 2018 Optical choppers with cylindrical rotational shafts for laser applications: a Finite Element Analysis

Eduard-Sebastian Csukas, Virgil-Florin Duma

Proceedings Volume 10785, Sensors, Systems, and Next-Generation Satellites XXII; 107851K (2018) https://doi.org/10.1117/12.2318308
Event: SPIE Remote Sensing, 2018, Berlin, Germany

Abstract

Optical choppers are used in a large range of applications in sensing, from radiometry to telescopes and laser setups. Classical macro-devices comprise of a rotating disk with windows with linear margins. While we have introduced, for the first time to our knowledge, a novel type of chopper disks, with windows with non-linear margins, outward or inward (the latter as a patent), in the present study we approach another type of chopper: with rotating shafts (patent pending). Different types of shafts (cylindrical, spherical, or conical) are possible, in combination with different shapes of slits, but in the present paper cylindrical shafts with a certain profile of slits are considered. The paper is focused on the possibility to reach much higher chop frequencies than with disks choppers. In order to achieve this, a Finite Element Analysis (FEA) is performed on shafts with four slits (two perpendicular channels). A range of geometrical parameters of the shafts and of the slits are considered, as well as two possible materials, i.e. structural steel and an aluminium alloy. A discussion on the structural integrity and of the deformations of the fast rotating shafts is performed, based on the FEA, with regard to the materials used and to the limits of the rotational speed of the device.

Citation Download Citation

Eduard-Sebastian Csukas and Virgil-Florin Duma "Optical choppers with cylindrical rotational shafts for laser applications: a Finite Element Analysis", Proc. SPIE 10785, Sensors, Systems, and Next-Generation Satellites XXII, 107851K (25 September 2018); https://doi.org/10.1117/12.2318308

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