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Quasi-optical testing system and method for terahertz frequency mixer

A test system, terahertz technology, applied in the field of terahertz test, can solve problems such as ineffective application of noise temperature test, difficulty in accurately measuring power, etc.

Inactive Publication Date: 2015-05-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

Since the direct measurement method and the gain measurement method need to know the gain of the mixer in advance, and the double power method is difficult to accurately measure the power of the output signal when the signal is weak, neither can be effectively applied to the noise temperature test in the terahertz frequency band

Method used

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  • Quasi-optical testing system and method for terahertz frequency mixer
  • Quasi-optical testing system and method for terahertz frequency mixer
  • Quasi-optical testing system and method for terahertz frequency mixer

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Embodiment

[0068] Such as figure 1 As shown, a quasi-optical test system for noise temperature and conversion loss of a terahertz mixer, the system includes a terahertz noise signal source, a local oscillator link, a beam splitter, a terahertz quasi-optic lens, a BLAS bias, an intermediate frequency link and power meter.

[0069] The BLAS bias is used for the power supply of the terahertz mixer; the local oscillator link includes a frequency multiplication link and a microwave signal source; the intermediate frequency link includes a first-stage low-noise amplifier, a second-stage low-noise amplifier, and a band-pass filter; The frequency band of the terahertz mixer is 335GHz-345GHz.

[0070] The terahertz noise signal source emits a terahertz noise signal, and the part of the terahertz noise signal passing through the beam splitter enters the terahertz quasi-optical lens and the terahertz mixer in turn;

[0071] The microwave signal source emits a microwave signal, and the microwave s...

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Abstract

The invention relates to the field of terahertz testing, in particular to a quasi-optical testing system and method for the noise temperature and frequency conversion loss of a terahertz frequency mixer. The system comprises a terahertz noise signal source, a local oscillation link, a beam splitter, a terahertz collimation lens, a BLAS (Basic Linear Algebra Subprograms) bias, a medium-frequency link and a power meter. The terahertz collimation lens is taken as a beam gathering device of the terahertz frequency mixer, so that the detection sensitivity of the terahertz frequency mixer is increased, and the problem of difficulty in detecting weak terahertz noise signals is effectively solved; a high-temperature blackbody source is taken as the terahertz noise signal source, so that the temperature change range of the terahertz noise signal source is expanded, and the testing range of the noise temperature of the testing system is effectively expanded; a two-stage low noise amplifier is adopted, so that the magnification times of medium-frequency signals are increased, the overall gain of a force testing system is effectively increased, and the problem that weak medium-frequency signals are easily submerged into noise is solved.

Description

technical field [0001] The invention relates to the field of terahertz testing, and relates to a quasi-optical testing system and testing method for noise temperature and frequency conversion loss of a terahertz mixer. Background technique [0002] Terahertz waves (THz) are a segment of electromagnetic radiation between microwaves and infrared. Due to the lack of effective technical approaches, the terahertz frequency band is the last segment of the electromagnetic spectrum to be developed, known as the "THz Gap" (terahertz gap). With the development of microelectronic technology, microwave technology and optical technology, terahertz detection technology has gradually grown. At present, the study of high-sensitivity terahertz detectors is an important part of the study of terahertz imaging systems. Among them, accurate measurement of noise temperature and conversion loss of terahertz mixer is a key technology to realize the wide application of terahertz technology. The d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
Inventor 司黎明于伟华薄淑华郭大路吕昕李明迅马朝晖乔海东王宝嵩唐贞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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