Characterization of Readout Electronics of Charge Coupled Devices (CCD) and Noise Characterization of IUCAA Digital Sampling Array Controller (IDSAC):

IUCAA Digital Sampling Array Controller (IDSAC) is an indigenous project carried out the Electronics Instrumentation lab of IUCAA. Today, a large number of telescope projects in the world will make use of a mosaic of CCDs for wide field of view operations. IDSAC has been built with the purpose of providing the readout electronic controllers required to process multiple CCD outputs simultaneously at high speeds and low noise levels.

IDSAC’s first paper was published in the SPIE journal in 2016. You can read the abstract here. I have co-authored the 2nd paper on IDSAC noise characterization which has been submitted and considered for publication in the Journal of Astronomical Telescopes, Instruments and Systems (JATIS).

I worked with Prof. A. N. Ramaprakash, Mr. Pravin Chordia, Mr. Sabyasachi Chattopadhyay and Mr. Bhushan Joshi on characterization of IDSAC and an engineering grade CCD in the lab to determine its performance before it is used at professional observatories.

I performed the hardware and software testing of the controller followed by a complete characterization for read noise, dark current, gain measurement, linearity, Charge Transfer Efficiency, Optimization of the number of samples and bandwidth for best noise performance and frequency analysis. Since my data are optical CCD images, I worked significantly on image processing algorithms and automation tasks while performing characterization tasks. On the hardware side, I was also responsible for developing the optics setup in the lab for performing several tests such as gain and linearity measurements and Region of Interest testing. One of the key areas I am working on is the spatial-frequency localization of noise in CCD images.

 

 

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Photograph in the dark room of the instrumentation lab of IUCAA. Behind me you can observe the dewar in which the CCD is housed under pressure free and liquid nitrogen cooled conditions.

 

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