GONG Hα Instrument

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Filter Status• 10 filters on order. Due Oct. 15.• Prototype uses a borrowed unit with old,inferior filter optics in a modern package.• Extensive NSO qualification testingprogram planned (wavefront, HWHM,transmission, etc.)September 22, 2009 <strong>GONG</strong> H-alpha Review 20
Filter Issue• Vendor has screened 1/5 of micainventory and found enough for our job.• But, vendor discovered a persistent indexgradient that shifts center wavelength.• Countering this by using a temperaturegradient in their oven (two heaters).• Vendor holds to on-time delivery but Iexpect this will add ~3 weeks.September 22, 2009 <strong>GONG</strong> H-alpha Review 21
Page 1 and 2: GONG Hα InstrumentJ. Harvey & GONG
Page 3 and 4: Instrument Design Goals• No signi
Page 5 and 6: Prototype Optical DesignPBSFCCDL1L2
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 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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