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dc.contributor.authorKawinkija, Adipthep
dc.contributor.authorBuisset, Christophe
dc.contributor.authorJones, Hugh
dc.contributor.authorMartin, Bill
dc.contributor.authorErrmann, Ronny
dc.contributor.editorHull, Tony B.
dc.contributor.editorKim, Dae Wook
dc.contributor.editorHallibert, Pascal
dc.date.accessioned2019-10-16T00:02:22Z
dc.date.available2019-10-16T00:02:22Z
dc.date.issued2019-09-09
dc.identifier.citationKawinkija , A , Buisset , C , Jones , H , Martin , B & Errmann , R 2019 , EXOhSPEC collimator mechanical design . in T B Hull , D W Kim & P Hallibert (eds) , Proc. SPIE 11116, Astronomical Optics : Design, Manufacture, and Test of Space and Ground Systems II . vol. 11116 , 111161G , Proceedings of SPIE - The International Society for Optical Engineering , vol. 11116 , SPIE , SPIE Optical Engineering + Applications , San Diego , United States , 11/08/19 . https://doi.org/10.1117/12.2529107
dc.identifier.citationconference
dc.identifier.isbn9781510629257
dc.identifier.issn0277-786X
dc.identifier.otherPURE: 17486141
dc.identifier.otherPURE UUID: 418dc298-637b-44b4-85d9-730a05200dfd
dc.identifier.otherScopus: 85074198969
dc.identifier.otherORCID: /0000-0003-0757-6689/work/64979942
dc.identifier.urihttp://hdl.handle.net/2299/21739
dc.description.abstractThe Exoplanet High-Resolution Spectrograph (EXOhSPEC) is a high-resolution spectrograph for the characterisation of exoplanets with the Thai National Telescope. The folded version of this instrument comprises one triplet lens to collimate the beam incident on the grating and to focus the beam reflected by the grating onto the camera. This collimator comprises three lenses L1, L2 and L3 of diameter varying between 50 mm and 60 mm. We specified the barrel to guarantee a maximum decenter of the lenses equal to 25 μm. The maximum error in the orientation of each single lens is specified to be lower than 0.03º. The proposed concept is based on a semi-kinematic mounting which is used to restrain these lenses with 6 and 30 N of preloads on the axial and lateral directions to ensure their stability. These preloads are applied to the lenses using the elastic pushing force of silicone elastomers and spring force from ball-plungers. We present the design of the collimator and the assembly method. Our Finite Element Analyses show that the maximum surface error induced by the preloads is lower than 60 nm Peak-To-Valley on each optical surface of L1, L2, and L3. We describe our manufacturing process using NARIT’s CNC machine and its validation using our Coordinate-Measuring Machine.en
dc.language.isoeng
dc.publisherSPIE
dc.relation.ispartofProc. SPIE 11116, Astronomical Optics
dc.relation.ispartofseriesProceedings of SPIE - The International Society for Optical Engineering
dc.subjectAstronomy
dc.subjectDesign
dc.subjectOpto-mechanics
dc.subjectPrecision engineering
dc.subjectSpectroscopy
dc.subjectElectronic, Optical and Magnetic Materials
dc.subjectCondensed Matter Physics
dc.subjectComputer Science Applications
dc.subjectApplied Mathematics
dc.subjectElectrical and Electronic Engineering
dc.titleEXOhSPEC collimator mechanical designen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionCentre of Data Innovation Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Atmospheric and Climate Physics Research
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85074198969&partnerID=8YFLogxK
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1117/12.2529107
rioxxterms.typeOther
herts.preservation.rarelyaccessedtrue


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