公开(公告)号：US12078693B1

公开(公告)日：2024-09-03

申请号：US18562342

申请日：2023-02-28

申请人： Purple Mountain Observatory, Chinese Academy of Sciences

发明人： Wei Miao ,  Shengcai Shi ,  Jing Li ,  Zhenhui Lin ,  Feiming Li ,  Qianghui Luo

IPC分类号： G01R33/32 ,  G01R33/035 ,  H10N60/12 ,  H10N60/80

CPC分类号： G01R33/0354 ,  G01R33/323 ,  H10N60/12 ,  H10N60/805

摘要： A terahertz graphene Josephson junction detection system based on readout of a microwave resonant circuit includes a graphene Josephson junction detector, a microwave resonant readout circuit, and a microwave network analyzer. The graphene Josephson junction detector and the microwave resonant readout circuit form a microwave resonant circuit. A terahertz signal causes a change of an equivalent microwave inductance of the graphene Josephson junction detector, such that a resonant frequency and a quality factor of the microwave resonant circuit are changed. The present disclosure monitors the resonant frequency and the quality factor of the microwave resonant circuit with the microwave network analyzer, thereby realizing high-sensitivity detection on the terahertz signal. Compared with conventional direct-current (DC)-biased readout, readout of the microwave resonant circuit is not interfered by an external magnetic field, and has a strong interference resistance.

公开(公告)号：US11994431B2

公开(公告)日：2024-05-28

申请号：US18385414

申请日：2023-10-31

申请人： Purple Mountain Observatory, Chinese Academy of Sciences

发明人： Zhenhui Lin ,  Qijun Yao ,  Dong Liu ,  Jie Liu ,  Wenying Duan ,  Shengcai Shi

IPC分类号： G01N21/3504 ,  G01J5/00 ,  G01J5/53 ,  G01J5/54 ,  G01J5/80 ,  G01J5/20 ,  G01N21/3586 ,  G01W1/06

CPC分类号： G01J5/804 ,  G01J5/0014 ,  G01J5/53 ,  G01J5/54 ,  G01J5/806 ,  G01J2005/208 ,  G01N21/3504 ,  G01N21/3586 ,  G01W1/06

摘要： An omnidirectional measurement system for a time-varying characteristic of atmospheric vapor radiation includes an antenna and calibrator assembly, a receiver assembly, a room temperature IF assembly, and a data acquisition and system control assembly. Atmospheric vapor features a wide profile and strong radiation in a frequency band of 183 GHz, and is often seen in the characteristic measurement of atmospheric vapor in high-altitude areas. The omnidirectional measurement system combines a superconductor-insulator-superconductor (SIS) mixer with high detection sensitivity in the frequency band of 183 GHz with a structure that integrates pitch scanning, omnidirectional scanning, and automatic calibration to achieve fast and high-precision omnidirectional scanning measurement of the time-varying characteristic of atmospheric vapor radiation. The omnidirectional measurement system has a pitch adjustment-based fast omnidirectional scanning function, and can measure the time-varying characteristic of atmospheric vapor radiation with higher precision and higher temporal resolution through the SIS mixer with higher sensitivity.

公开(公告)号：US11159246B2

公开(公告)日：2021-10-26

申请号：US17263163

申请日：2020-07-16

申请人： Purple Mountain Observatory, Chinese Academy of Sciences

发明人： Yuan Ren ,  Shengcai Shi ,  Daixi Zhang

IPC分类号： H04B10/61

摘要： A grating- and fiber-coupled multi-beam coherent receiving system in a mid- and far-infrared band includes a mid- and far-infrared local oscillator signal source, a phase grating, a multi-beam fiber coupling system, a 2×2 pixel mid- and far-infrared superconducting HEB mixer, a multi-channel DC bias source, a multi-channel cryogenic low-noise amplifier, and a room-temperature intermediate-frequency and high-resolution spectrum processing unit. In a 2×2 multi-beam superconducting receiving system, an echelle grating and a cryogenic optical fiber are used to distribute and couple the local oscillator signal, and the mid- and far-infrared band high-sensitivity superconducting HEB mixer is used to realize efficient local oscillator signal distribution and coupling, and ultimately achieve high-sensitivity and high-resolution multi-beam spectrum reception in the mid- and far-infrared band.