29 June 2006 Nine-channel tip/tilt detector at the CHARA Array
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Abstract
A new CCD based tip/tilt detection system was installed in the CHARA array on August 21, 2005. The new system can serve six telescopes simultaneously and is sensitive to a wavelength as long as 1 μm. The tip/tilt camera is based on an E2V CCD39-01, a small (80×80) back illuminated frame transfer device with a pixel size of 24×24 μm2. The measured read-out noise and conversion gain of the camera is 6.4 e- at 384 kpx s-1 and 1.1 e-/ADU, respectively at a temperature of -30 C°. Nine quad-pixel channels have been created on the CCD in a 10×10 pixel sub-array close to one of the read out amplifiers. Vignetting on the quad-pixel channels is negligible. Crosstalk between adjacent channels has been eliminated. The image scale on the CCD is 3.46 arcsecs/pixel. The limiting magnitude is expected to be V=12 at 20 ms integration time under good seeing conditions.
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Laszlo Sturmann, Judit Sturmann, Theo ten Brummelaar, Harold A. McAlister, "Nine-channel tip/tilt detector at the CHARA Array", Proc. SPIE 6268, Advances in Stellar Interferometry, 62683T (29 June 2006); doi: 10.1117/12.671855; https://doi.org/10.1117/12.671855
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