Apparatus for detecting thz signal frequency spectrum by superconduction josephson junction

A signal spectrum and terahertz technology, which is applied in the field of terahertz spectrum information detection, can solve problems such as low system integration, complex structure, and large volume, and achieve the effects of expanding application range, reducing volume, and simplifying the system

Inactive Publication Date: 2009-01-21
NANJING UNIV
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Problems solved by technology

[0018] However, the structure of this device is complicated, there are many components, the volume is large, and the system integration is not high, resulting in relatively high cost.

Method used

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  • Apparatus for detecting thz signal frequency spectrum by superconduction josephson junction
  • Apparatus for detecting thz signal frequency spectrum by superconduction josephson junction
  • Apparatus for detecting thz signal frequency spectrum by superconduction josephson junction

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Embodiment Construction

[0037] The superconducting terahertz signal spectrum detection device of the present invention is as figure 2 shown, including:

[0038] Josephson junction and its refrigeration device: it is the core component of the device;

[0039] Quasi-optical system: placed between the Josephson junction and the terahertz signal source, the terahertz signal is converged to the Josephson junction, and the coupling between the signal and the Josephson junction is improved;

[0040] Optical chopper: placed between the quasi-optical system and the signal source, mechanically modulates the terahertz signal, and outputs the frequency of the modulated signal in the form of a voltage as a reference signal;

[0041] Terahertz signal source: a terahertz signal is generated by an oscillator, and the signal frequency is within the range that the system can measure;

[0042] Preamplifier: After the Josephson junction, it is used to amplify the weak voltage signal, which is the voltage drop on the ...

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Abstract

The invention discloses a device which utilizes josephson junction to detect terahertz signal spectrums, the main improvement is that first, the device utilizes a mini refrigerator to replace a liquid nitrogen vessel in the original system to refrigerate, second, a current supply which is controlled by voltage is formed by a scanning voltage module in a DSP system and an external voltage-current conversion circuit to replace a current bias circuit of josephson junction in the original system, and third, a lock-in amplifier and a digital multimeter in the original system are replaced by a DSP data collecting and processing system. The device adopts an improved DSP technique, which integrates the main functions of the generation of sweep signals, the automatic measurement control, the lock-in amplifier and the like, thereby greatly reducing the volume of the device, lowering the production cost, and achieving the intellectualization and the miniaturization of the device.

Description

1. Technical field [0001] The invention relates to a system for measuring electromagnetic signals by using a superconducting Josephson junction, and the system is mainly used for detecting terahertz (THz) spectrum information. 2. Background technology [0002] The rapid development of ultrafast laser technology in the past decade has greatly promoted the development of terahertz wave generation, detection and application technology. This electromagnetic wave band, once called "THz blank", has made a lot of progress in the research in recent years. In order to study and apply terahertz technology, terahertz wave detection has become an urgent problem to be solved. There are many terahertz wave detection methods, each with its own characteristics. Among them, using a superconducting Josephson structure to form a spectrum information detector is a new achievement in the research and application of terahertz detection technology. [0003] At present, the use of spectrum analyz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 许伟伟陈健吴培亨
Owner NANJING UNIV
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