Next generation of a sub-millimetre wave security camera utilising superconducting detectors
in: Journal of Instrumentation (2013)
Based on the previously demonstrated concept of passive security screening utilising superconducting detectors, a next generation camera was developed to meet application demands. The new system was designed to achieve background limited performance using a linear array of up to 128 transition edge sensors which are read in a time domain multiplexing scheme by SQUID current sensors. It will be able to record videos with 256 128 pixels at 25 Hz frame rate. The necessary cooling of the detector array is provided by a commercial pulse tube cooler and a second, self-contained cooling stage. For imaging, different optics modules adapted to a feed-horn detector coupling can be used in combination with a linear scanning apparatus for mirrors up to 40 cm.