Work

A reference-beam multi-slit autocollimator built using off-the-shelf components with variable number of slits and increased sensitivity at frequencies from 1 to 100 Hz

Year: 2020

Type: article

Abstract: Optical levers for precision angle measurement have the advantage of exerting only a negligible force on the object being measured. Also, in autocollimating configuration, optical levers are insensitive to longitudinal movements of the target mirror. In this article, a reference-beam multi-slit autocollimator with variable number of slits, built from cost-effective off-the-shelf components, is presented. Further, an optimized algorithm for data processing is introduced, reducing computational effort for repeated Gaussian peak fitting. In the described setup, by adjusting the number of slits, the measurement range can be increased at the cost of sensitivity, and vice versa. In the tested configuration with 28 slits, the device has a measurement range of 12 mrad, and a sensitivity in the order of nrad/ Hz starting at frequencies of 0.1 Hz, with increased sensitivity compared to other recently described autocollimators at frequencies over 1 Hz.

Source: Journal of Measurements in Engineering

DOI: 10.21595/jme.2020.21210

Authors: Nikolaus Dragostinoff, David Alexander Müller, Nicole Plank

Institution: Austrian Center for Medical Innovation and Technology

Language: English

Topic: Optical measurement and interference techniques

Subfield: Computer Vision and Pattern Recognition

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $808

Funders: Amt der NÖ Landesregierung, Australian Government, Austrian Center for Medical Innovation and Technology