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Proceedings Paper

Readout system for the terahertz superconducting imaging array (TeSIA)
Author(s): Sheng Li; Jin-Ping Yang; Wen-Ying Duan; Zhen-Hui Lin; Jing Li; Sheng-Cai Shi
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Paper Abstract

Terahertz Superconducting Imaging Array (TeSIA) is a project for the development of a large THz direct-detection array for mapping observations. The prototype of TeSIA is an 8×8 pixel direct-detection array operating at the 850 μm band, incorporating THz superconducting detectors such as kinetic inductance detectors (KIDs) and transition edge sensors (TES). KIDs have the advantage that only a broadband low noise cryogenic amplifier is needed at low temperature for the readout system, and hundreds of pixels could be readout simultaneously by the frequency-division multiplexing (FDM) technique. The readout system for a KIDs array is composed of several parts like excitation signal generating, intermediate frequency (IF) circuit, baseband signal acquisition and processing. Excitation signal is a kind of comb signal carrying various frequencies corresponding simply to resonant frequencies of the detectors. It is generated in baseband with a bandwidth covering all KIDs and up-converted to microwave frequency (about several gigahertz) to feed the detectors. With THz radiation, the forward transmission coefficient (S21) of all KIDs varies and the variation can be measured through the comb signal. Fast Fourier transform (FFT) with pipeline structure will be used to process the baseband excitation signal in real time. Consequently, the radiation intensity can be estimated by monitoring the signal amplitude and phase of the corresponding frequency channels. In this paper we will present mainly the design ofan electronic readout system for the 8×8 pixel array.

Paper Details

Date Published: 5 December 2012
PDF: 5 pages
Proc. SPIE 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II, 85620L (5 December 2012); doi: 10.1117/12.999786
Show Author Affiliations
Sheng Li, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
Graduate Univ. of the Chinese Academy of Sciences (China)
Jin-Ping Yang, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
Wen-Ying Duan, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
Graduate Univ. of the Chinese Academy of Sciences (China)
Zhen-Hui Lin, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
Jing Li, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
Sheng-Cai Shi, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)


Published in SPIE Proceedings Vol. 8562:
Infrared, Millimeter-Wave, and Terahertz Technologies II
Cunlin Zhang; Xi-Cheng Zhang; He Li; Sheng-Cai Shi, Editor(s)

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