Development of an automated system for the measurement of focal ratio degradation of high numerical aperture fibres

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dc.contributor.authorLee, Jooyoung
dc.contributor.supervisorBradley, Colin
dc.contributor.supervisorJun, Martin Byung-Guk
dc.date.accessioned2019-08-07T22:39:42Z
dc.date.available2019-08-07T22:39:42Z
dc.date.copyright2019en_US
dc.date.issued2019-08-07
dc.degree.departmentDepartment of Mechanical Engineeringen_US
dc.degree.levelMaster of Applied Science M.A.Sc.en_US
dc.description.abstractThe thesis presents the development and testing of an automated fibre optic test system for the measurement of focal ratio degradation (FRD) in high numerical aperture fibres. In particular, the fibres under examination are being proposed for use in the Maunakea Spectroscopic Explorer (MSE), a new telescope currently being designed for wide-field surveys of the night sky. A critical subsystem of the MSE is the Fiber Transmission System (FiTS) that connects the focal plane to the telescope’s spectrographs. In preparation for MSE-FiTS, a method of characterizing the focal ratio degradation (FRD), between the input and output of every fibre, of candidate multi-mode fibres is highly important. The ultimate goal is the testing of all 4,332 fibres after assembly and prior to installation on MSE. An optical bench has been constructed to test the performance of an automated characterization system; a variation on the collimated beam test. Herein we present the underlying analysis FRD measurement method, the optical design of the test bench, the motion control system and the software for measuring FRD, and controlling the automated test system. The open-source automation software is also introduced; the Big FiTS Fibre Wrapper (Big FFW). The results of tests performed using the Big FFW on samples of candidate fibres are presented and compared with the results in the literature using manual methods. The results suggest that the candidate MSE fibre meets the science requirement of less than 5% focal ratio degradation for an f/2 input beam measured at the fibre output. There is less than 1% disagreement between the automated measurement method and manual methods reported in the literature. The fully automated system can measure the FRD of up to 10 fibres in a typical MSE fibre bundle configuration.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.bibliographicCitationMonty, Stephanie, Farbod Jahandar, Jooyoung Lee, Kim A. Venn, Colin Bradley, Darren Erickson, David Crampton et al. "Automated testing of optical fibres: towards the design of the Maunakea Spectroscopic Explorer Fibre Transmission System." In Ground-based and Airborne Instrumentation for Astronomy VII, vol. 10702, p. 107027I. International Society for Optics and Photonics, 2018en_US
dc.identifier.urihttp://hdl.handle.net/1828/11024
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectMSEen_US
dc.subjectFibresen_US
dc.subjectFocal Ratio Degradationen_US
dc.subjectFRDen_US
dc.subjectThroughputen_US
dc.subjectGRACESen_US
dc.titleDevelopment of an automated system for the measurement of focal ratio degradation of high numerical aperture fibresen_US
dc.typeThesisen_US

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