GONG Hα Instrument

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CCD Camera Requirements 2• Robust for unattended field use.• Affordable and readily available.• Camera makes good use of CCD.• Programmable exposure time.• Industry standard interface.• Available software and support.• Good performance at high speed.• No interference fringing.September 22, 2009 <strong>GONG</strong> H-alpha Review 28
CCD and Camera Selection• Kodak KAI-4022 interline transfer CCD– 2048 x 2048 7.4μ pixels– 38000 e- FW– Microlenses• DVC(Digital Video Camera Co)-4000AM camera, uncooled– 4.35 fps @ 20 MHz (low noise mode)– 12 bit A/D, 1 ADU = 9 e-– 10 e- RMS camera readout noise– dark clamped for good dark stability– Add 4 exposures to improve dynamic rangeSeptember 22, 2009 <strong>GONG</strong> H-alpha Review 29
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 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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