1.56m望远镜#1 CCD照相机增益和读出噪音的重新测定

摘要

上海天文台1.56m望远镜使用的CCD照相机是在Lick天文台用该台的控制电路组装的,其原有的增益和读出噪音表,也是于2002年在该台测定的.由于控制电路曾经维修过,以及电路元件不可避免的老化,增益和读出噪音值都有很多变化.因此于2009年2月和3月重新测定了该照相机的增益和读出噪音.结果表明,左放大器的增益为0档,读出速度为medium的组合,右放大器的多种增益和读出速度组合,新老测定值相差悬殊,并且有的测定值不稳定.可能这些组合的电路元器件已接近损坏.%The CCD camera of the 1.56m reflector was built at Lick Observatory on the basis of the observatory's control electronics design. The gain and the readout noise of the camera were also determined at Lick Observatory in 2002. Because the controller was repaired since 2002 and the electronics are ageing inevitably, the gain and the readout noise have changed obviously. Therefore, the re-determination was made in Febrary and March of 2009.