Receiving system of multi-pixel superconducting detector and terahertz signal detecting method

Abstract

The invention discloses a receiving system of a multi-pixel superconducting detector. The system consists of a terahertz frequency range local oscillator signal source, a wideband wave beam separator, a Michelson interferometer, a superconducting SIS or HEB detector array, a multi-channel direct-current bias supply, a multi-channel reading circuit and band frequency spectrum processing unit, a low-temperature and low-noise amplifier and a normal-temperature intermediate frequency and matched high-resolution frequency spectrum processing unit, wherein the terahertz frequency range local oscillator signal source adopts a millimeter wave band solid local oscillator source and is formed in a way of frequency multiplication amplification; the wideband wave beam separator adopts a 15 to 75-micron Myler membrane which has high permeability in a terahertz frequency range; the superconducting detector adopts a superconducting SIS detector in the terahertz frequency range and adopts a superconducting HEB detector in a high frequency range; the low-temperature and low-noise amplifier adopts a low-noise amplifier integrating MMIC technology; and the high-resolution frequency spectrum processing unit adopts digital frequency spectrum technology with high resolution. The layout of the multi-pixel superconducting detector adopts a square array of which the technique is easy to realize, makes the main wave beams of the remote radiation fields of plane antennae integrated on each superconducting detector pixel not overlapped on the basis of a compact structure at the same time, and ensures that signals received by the multi-pixel superconducting detector are interfered by neighboring pixels as low as possible.

Description

technical field [0001] The invention relates to the field of signal detection, in particular to an n x m pixel superconducting detector receiving system and a terahertz signal detection method based on the system. Background technique [0002] At present, signal detection in the terahertz band (0.1THz-10THz) can be divided into two types. One is non-coherent detection (direct detection method), which can realize higher-sensitivity broadband mid-to-low resolution signal detection, such as the detection of continuum signals or high-redshift celestial signals outside the Milky Way; the other is coherent detection (super Heterodyne mixing method), coherent detection can realize narrow-band high-resolution signal detection, such as signal detection of molecular spectral lines with ultra-fine structure. These two methods have been widely used in radio astronomy, atmospheric composition detection and monitoring and other fields. In order to further improve observation efficiency,...

AI Technical Summary

Problems solved by technology

At present, the terahertz signal detection method based on the integration of coherent and non-coherent detection technologies based on the multi-pixel receiving system has not been reported yet.

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