Theoretical approach on the linearity increase of scanning functions using supplemental mirrors

Maria-Alexandra Duma; Virgil-Florin Duma

doi:10.1117/12.2517282

14 April 2019 Theoretical approach on the linearity increase of scanning functions using supplemental mirrors

Maria-Alexandra Duma, Virgil-Florin Duma

Proceedings Volume 11028, Optical Sensors 2019; 1102817 (2019) https://doi.org/10.1117/12.2517282
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

The most utilized laser scanners, galvanometer-based or with polygonal mirrors produce non-linear scanning. This is a major issue of these devices, as for most applications a constant scan speed (therefore a linear scanning) should be provided. While common linearizing solutions include for example expensive F-theta lenses, we study a simple, lowcost solution, with a two-mirror angular device – in order to linearize the scanning function by increasing the distance between the scanner and its objective lens (i.e., by using an objective lens with an as high as possible object focal length) in a compact solution. By using supplemental mirrors, this object focal length can be folded in order to minimize the dimensions of the assembly. We have used in a previous study a classical approach to this problem. In the present one we propose another method to solve the problem of the total number of images produced by the two-mirror device, as well as the maximum scanner-to-lens distance that can be introduced by the device. The impact of the constructive parameters of the device on these characteristics is pointed out. Design conclusions can be drawn from this study.

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Maria-Alexandra Duma and Virgil-Florin Duma "Theoretical approach on the linearity increase of scanning functions using supplemental mirrors", Proc. SPIE 11028, Optical Sensors 2019, 1102817 (14 April 2019); https://doi.org/10.1117/12.2517282

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KEYWORDS

Mirrors

Scanners

Laser scanners

Objectives

Lenses

Microelectromechanical systems

Telescopes

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