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dc.contributor.authorShearer, Andrewen
dc.date.accessioned2011-03-10T17:00:36Zen
dc.date.available2011-03-10T17:00:36Zen
dc.date.issued2009en
dc.identifier.citationPatrick P. Collins, Brendan Shehan, Michael Redfern, Andrew Shearer...(2009)GASP - Galway Astronomical Stokes Polarimeter, Patrick P. Collins, Brendan Shehan, Michael Redfern, Andrew Sheareren
dc.identifier.urihttp://hdl.handle.net/10379/1739en
dc.description.abstractThe Galway Astronomical Stokes Polarimeter (GASP) is an ultra-high-speed, full Stokes, astronomical imaging polarimeter based upon a Division of Amplitude Polarimeter. It has been developed to resolve extremely rapid stochastic, millisecond variations in objects such as optical pulsars, RRATs and magnetic cataclysmic variables. GASP has no moving parts or modulated components, so the complete Stokes vector can be measured from just one exposure - making it unique to astronomy. Furthermore the time required for the determination of the full Stokes vector is limited only by the time resolution of the detectors used and the incident photon fluxes. GASP utilizes a modified Fresnel rhomb, which acts as a highly achromatic quarter wave plate and a beamsplitter (referred to as an RBS). Here we present a description of how the DOAP works, some of the optical designs for the polarimeter, and give some preliminary results. Calibration is an important, and difficult issue with all polarimeters, but particularly in astronomical polarimeters. We give a description of calibration techniques appropriate to this type of polarimeter, particularly the Eigenvalue Calibration Method of Compain & Drevillonen
dc.formatapplication/pdfen
dc.language.isoenen
dc.subjectAstrophysics - Instrumentation and Methods for Astrophysicsen
dc.subjectAstrophysics - Galaxy Astrophysicsen
dc.titleGASP - Galway Astronomical Stokes Polarimeteren
dc.typeArticleen
dc.local.publishedsourcehttp://arxiv.org/pdf/0905.0084en
dc.description.peer-reviewedpeer-revieweden
dc.local.authorsPatrick P. Collins, Brendan Shehan, Michael Redfern, Andrew Sheareren
dc.local.arxivid0905.0084en
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