GONG Hα Instrument

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Camera Dark Noise vs Exposuredark noise vs expRMS noise (ADU)141210864200 1000 2000 3000uncooledcooled #2•Cooling reducesdark current bylarge factor•Not a significantfactor at ourexposure timesof ~40 msec•May need tofilter some hotpixelsExp time (msec)September 22, 2009 <strong>GONG</strong> H-alpha Review 32
Camera Light Responselo g sig maphoton transfer1.61.41.210.80.60.40.200 0.5 1 1.5 2 2.5 3 3.5 4log meanmean signallinearity4500400035003000250020001500100050000 20 40 60 80 100 120 140 160 180exp time (msec)•Textbook response•Confirms FW & gain•Highly linear responseSeptember 22, 2009 <strong>GONG</strong> H-alpha Review 33
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 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 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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