GONG Hα Instrument

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Basic Plan• Extract Hα light with a beamsplitter.• Use a Fabry-Perot filter to isolate Hα.• Form image on 2048 x 2048 CCD camera.• Replace existing diffuser for better flat fieldcalibration.September 22, 2009 GONG H-alpha Review 4
Prototype Optical DesignPBSFCCDL1L2L3L4PBS - polarizing beamsplitter, RMI customL1- plano convex lens, f=450 mm, OptoSigma 011-2358-A55L2- plano convex lens, f=800 mm, OptoSigma 011-2770-A55F- H-alpha filter, d=32 mm, Daystar Quantum PE 0.4AL3- positive achromat, f=300 mm, OptoSigma 026-1380L4- negative achromat, f=-100 mm, Edmund NT62-494Not shown: Fold mirror, Edmund K30-258Diffuser, Luminit L1P6MD-73 1°September 22, 2009 GONG H-alpha Review 5
Page 1 and 2: GONG Hα InstrumentJ. Harvey & GONG
Page 3: Instrument Design Goals• No signi
Page 8 and 9: Field Curvature & DistortionSeptemb
Page 10 and 11: Optics Summary• Simple system mee
Page 12 and 13: Hα Filter Selection• Considered
Page 14 and 15: Filter Test SetupCMOScamera,lens an
Page 16 and 17: Sample Filter HWHM•Fit Fabry-Pero
Page 18 and 19: Solar Test Setup• Rooftop light f
Page 20 and 21: Filter Status• 10 filters on orde
Page 22 and 23: Filter StatusC:\Documents andSettin
Page 24 and 25: September 22, 2009 GONG H-alpha Rev
Page 26 and 27: Filter Concerns• Delivery.• Wav
Page 28 and 29: CCD Camera Requirements 2• Robust
Page 30 and 31: Camera Tests• Tested cooled and u
Page 32 and 33: Camera Dark Noise vs Exposuredark n
Page 34 and 35: Camera Noise vs LightNoise vs Signa
Page 36 and 37: Camera Results• Cameras show expe
Page 38 and 39: Mechanical Requirements• Simple i
Page 40 and 41: Sled DetailSeptember 22, 2009 GONG
Page 42: Remaining Issues• Optics- Quality

GONG Hα Instrument

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