HMI Peer Review - Helioseismic and Magnetic Imager for ：HMI的同侪审查- helioseismic和磁成像仪.pptVIP

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HMI Peer Review - Helioseismic and Magnetic Imager for ：HMI的同侪审查- helioseismic和磁成像仪.ppt

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HMI Peer Review - Helioseismic and Magnetic Imager for ：HMI的同侪审查- helioseismic和磁成像仪

Optics Alan Title, HMI-LMSAL Lead, title@ Rick Rairden, Optics Lead, rairden@ Agenda – Optics PDR Scope: This review covers the lenses, mirrors, and beamsplitters in the imaging system. Broad and narrow band filters are covered in a separate section of the PDR. Agenda Optical system requirements MDI heritage Optical System Descriptions of each element Tolerance approach Summary Design status Next steps Performance Requirements 1 arc-sec diffraction limited Full Sun image at the science sensors Focus adjustment range of 16.4 mm in equal steps A full disk solar image for image stabilization via limb sensing A telecentric beam through the Lyot filter for minimum spectral field effects Optical system unvignetted Separate science focal planes for Doppler and vector field measurements A spectral calibration mode that operates on unimaged sunlight HMI Optics Heritage from MDI The HMI optical design features common with MDI: Simple two element refracting telescope to form primary image Image Stabilization System with a solar limb sensor and PZT driven tip-tilt mirror The HMI optics improvements from MDI: Larger aperture, higher spatial resolution 4096x4096 pixel CCDs instead of a single 1024x1024 pixel detector in MDI in order to properly sample the spatial resolution over the entire field of view Two science focal planes to make both Doppler and vector magnetic field measurements at the required cadence and to provide redundancy HMI Optical Layout Top Level Design Properties Optical System Physical Layout of Optical Elements Layout to scale Optical Elements Full Aperture Filter (filters are discussed in a separate section) Primary Aspheric Objective Lens Secondary lens Focus blocks (6) Calibration lenses (2) Polarizing beamsplitter Blocking Filter Telecentric Lens Lyot Filter Beam shaping lens Michelson Filter Reimaging lenses (2) Beamsplitter Folding mirrors (4) Telescope 15.0 cm diameter aspheric objective lens BK7G18 radiation resistant glass Conic constant