24 July 2014 A low-noise HAWAII detector system and new cold optics for the CLASSIC/CLIMB beam combiner instrument of the CHARA array
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Abstract
As part of a new collaboration between CHARA and the Max Planck Institute for Radio Astronomy, we have developed a new detector system for the CLASSIC/CLIMB beam combiner of the CHARA Array. This detector is based on the Rockwell HAWAII-1 HgCdTe focal plane array and has lower readout noise (∼5 electrons) than the current PICNIC based system. Presently, CLASSIC/CLIMB observations at different wavelength bands can be made only successively by selecting individual filters in a filter wheel. Therefore, another upgrade goal is to install a non-deviating prism in order to image the H- and K’-band light onto separate detector pixels and to simultaneously observe in the H and K’ bands. The detector control electronics were built at the Max Planck Institute for Radio Astronomy. The goal was to achieve the lowest possible readout noise and electronic pick-up noise. The detector readout noise can be significantly reduced by the following approach: First, the analog detector output signal is processed by a moving boxcar filter consisting of an analog approximation of a finite impulse response filter with a response time adapted to the 10 MHz sample rate of an analog-to-digital converter. Second, a digital filter averages up to 1024 samples for each addressed pixel. This hybrid (analog plus digital) filter approach gives a unique flexibility of a programmable bandwidth for optimum noise reduction.
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Udo Beckmann, Udo Beckmann, Claus Connot, Claus Connot, Matthias Heininger, Matthias Heininger, Karl-Heinz Hofmann, Karl-Heinz Hofmann, Eddy Nußbaum, Eddy Nußbaum, Dieter Schertl, Dieter Schertl, Walter Solscheid, Walter Solscheid, Theo ten Brummelaar, Theo ten Brummelaar, Nils Turner, Nils Turner, Gerd Weigelt, Gerd Weigelt, } "A low-noise HAWAII detector system and new cold optics for the CLASSIC/CLIMB beam combiner instrument of the CHARA array", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91461W (24 July 2014); doi: 10.1117/12.2055850; https://doi.org/10.1117/12.2055850
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