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在亚毫米波频段,表征信号源的频谱特性是一项重要工作.用外差混频和直接检波(傅里叶变换频谱仪,FTS)两种方法测量一个亚毫米波连续波源(采用锁相技术且可在460~520GHz范围内调频)的频谱.500~GHz频段超导SIS隧道结在外差混频方法里用作混频器,而在直接检波方法里作为直接检波器.并对两种方法得到的结果进行了比较.
In the sub-millimeter wave band, it is an important task to characterize the spectral characteristics of the signal source.Two methods of heterodyne mixing and direct detection (Fourier transform spectrum analyzer, FTS) are used to measure a sub-millimeter wave continuous wave source Technology and can be in the range of 460 ~ 520GHz frequency spectrum.) 500 ~ GHz band superconducting SIS tunnel junction used in the heterodyne mixing method as a mixer, and in the direct detection method as a direct detector. And two The results obtained by the method were compared.