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New developments for mosaic CCDs

Han, Wonyong; (1993) New developments for mosaic CCDs. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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The imaging areas of currently available optical detectors are relatively small to cope with large image areas, such as telescope focal planes. One possibility to obtain large detection areas is to assemble mosaics of Charge Coupled Devices (CCDs), and drive them simultaneously. Parallel driving of many CCDs together rules out the possibility of individual tuning; however, such optimisation is very important, when the ultimate low light level performance is required, particularly for new, or mixed devices. In this work, a new concept has been developed for an entirely novel approach, where the drive waveforms are multiplexed and interleaved. This simultaneously reduces the number of leadout connections and permits individual optimisation efficiently. The controller has been designed to include one EPLD (Erasable Programmable Logic Device) produced by a CAD software package, where most of the digital circuits are integrated, to minimise the component count and improve the efficiency of the system greatly. The system software has an open architecture to permit convenient modification by the user, to fit their specific purposes. The design of controller allows great flexibility of system parameters by the software, specifically for the compatibility to deal with any number of mixed CCDs, and in any format, within the practical limit. The system has been integrated to test its performance, and the result is discussed for the system noise, the linearity and the cross-talk between the CCDs. The system developed in this work can be applicable, not only for astronomical observation with a telescope, but also in other related fields for low light level detection systems, such as spectroscopic application, remote sensing and X-ray detection systems, with large sensing areas and high resolution.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: New developments for mosaic CCDs
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Thesis digitised by ProQuest.
Keywords: Pure sciences; Optical detectors
URI: https://discovery.ucl.ac.uk/id/eprint/10104459
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