GONG Hα Instrument

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Optics Summary• Simple system meets needs.• Traded a 0.12Å radial variation of centralwavelength vs. radius to get best spatialuniformity.• All glass optics purchased and in house.• All lenses tested.• Prototype running at GONG test site.• Does not interfere with normal GONGoperations. New diffuser works well.September 22, 2009 GONG H-alpha Review 10
Hα Filter Requirements• Passband narrow enough to see flares,plages, filaments and prominences.• Affordable and readily available.• Robust for unattended field use.• Transmission suitable for short exposures.• Useable with existing optical system.September 22, 2009 GONG H-alpha Review 11
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 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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