A Frequency Sweeping Readout System for Kinetic Inductance Detectors Based on Submillimeter Radio Astronomy

作者：Kiuchi Hitoshi^*; Okada Takashi; Karatsu Kenichi; Sekimoto Yutaro

来源：IEEE Transactions on Terahertz Science and Technology, 2015, 5(3): 456-463.

DOI：10.1109/TTHZ.2015.2413751

• Digital signal processing (DSP)
• frequency modulation
• radio astronomy
• submillimeter-wave measurement
• superconducting device

We have been developing a superconductive detector array for terahertz astronomical observation using Microwave Kinetic Inductance Detector (MKID) technology. MKID is accomplished by making a strip of superconductor part of a microwave resonant circuit, and monitoring the phase and amplitude of a probe signal transmitted through the resonator. Frequency-domain multiplexing will allow up to thousands of resonators to be read out through a single line. We developed a 600-pixel 220 GHz detector array and a 102-pixel 440-GHz detector array. We have developed a new scheme readout system for the detector arrays, and which uses a frequency-sweeping probe signal instead of a fixed-frequency probe signal. This scheme enables us a direct measurement of the changed resonance frequency after optical loading.

• 出版日期2015-5
• 单位中国科学院国家天文台