Progress towards recalibration of spectrographs

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dc.contributor.authorKallepalli, Akhil
dc.contributor.authorSoori, Umair
dc.contributor.authorJames, David
dc.contributor.authorRichardson, Mark A.
dc.date.accessioned2019-03-25T10:37:26Z
dc.date.available2019-03-25T10:37:26Z
dc.date.issued2019-03-07
dc.description.abstractThe spectral resolution of a spectrograph depends on the input slit width, the diffraction grating grooves and the number of imaging sensor/detector pixels. Due to the proprietary nature of spectrograph designs, recalibration by end-users can be challenging. Most calibration procedures currently published are applicable to in-house instruments or spectrographs with access to the internal specifications. Narrowing the input slit improves the resolution but also reduces the throughput of the imaging system. We attempted to recalibrate an Offner-based spectrograph by using a larger detector plane (an imaging system with a larger sensor), to vary the distance along the focal plane; and by utilising lens optics. Basic experiments were conducted by varying the distance from the exit window and inserting a lens to magnify the spectrograph output onto the larger detector plane. We concluded that the calibration could not be achieved using simple optics within the scope of our experiments. This article addresses a gap in literature that does not present the research community with the unsuccessful steps that are not applicable to similar problem statements. The alternative would be to rely on reflective optics, but this approach may reduce portability.en_UK
dc.identifier.citationKallepalli A, Soori U, James DB and Richardson MA., Progress towards recalibration of spectrographs. In: 2018 IEEE British and Irish Conference on Optics and Photonics (BICOP), Royal Society, London, 12-14 December 2018.en_UK
dc.identifier.isbn978-1-5386-7361-4
dc.identifier.uri10.1109/BICOP.2018.8658336
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14004
dc.language.isoenen_UK
dc.publisherIEEEen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectOffner-based Spectrographsen_UK
dc.subjectOptical Equipmenten_UK
dc.subjectSpectral Domainen_UK
dc.subjectFocal Plane Arrayen_UK
dc.subjectDiffraction Gratingsen_UK
dc.titleProgress towards recalibration of spectrographsen_UK
dc.typeConference paperen_UK

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