Terahertz wave beam splitting system

A Gaussian beam and phase grating technology, applied in the field of terahertz wave imaging, can solve the problems of complex lithography technology and low diffraction efficiency of gratings, and achieve the effect of high diffraction efficiency, reduced complexity, and easy processing.

Active Publication Date: 2020-04-17
SOUTHEAST UNIV
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Problems solved by technology

The depth variation of the phase discrete Dammann grating is a rectangular wave whose edge is perpendicular to the horizontal plane. Not only the steep edge processing requires the use of complex photolithography technology, but also the diffraction efficiency of the obtained grating is also low.

Method used

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  • Terahertz wave beam splitting system
  • Terahertz wave beam splitting system
  • Terahertz wave beam splitting system

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Embodiment 1

[0026] refer to figure 1 , this embodiment provides a terahertz wave beam splitting system, the terahertz wave beam splitting system includes a frequency source plus frequency multiplier module 1, a Gaussian beam forming horn antenna 2, a 90-degree offset parabolic reflector A3, a The four-dimensional Fourier phase grating 4, the 90-degree offset parabolic reflector B5 and the pyroelectric detector 6, and all components in the terahertz beam splitting system are placed according to the optical path 7. The output signal frequency of the frequency source multiplier module 1 is 300 GHz, the focal lengths of the 90-degree offset parabolic mirror A3 and the 90-degree offset parabolic mirror B5 are both set to 250 mm, and the unit size of the one-dimensional Fourier phase grating 4 is It is: 8mm×8mm, and the number of units is: 5×5. At the same time, the one-dimensional Fourier phase grating 4 is reflective, so it has a periodic structure, and the one-dimensional Fourier phase grati...

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Abstract

The invention discloses a terahertz wave beam splitting system. The device comprises a frequency source frequency multiplier module, a Gaussian beam shaping horn antenna, a one-dimensional Fourier phase grating, a thermoelectric detector and two 90-degree offset parabolic mirrors, the output end of the frequency source frequency multiplier module is electrically connected with the input end of a Gaussian beam shaping horn antenna; an output signal is coupled to a free space through a Gaussian beam shaping horn antenna; the beam waist position of an output signal coincides with the focus of the90-degree offset parabolic mirror A, the output signal is sent to the surface of the one-dimensional Fourier phase grating through collimation of the 90-degree offset parabolic mirror A and is bunched through the 90-degree offset parabolic mirror B, and the thermoelectric detector can scan and receive the bunched signal. The terahertz wave beam splitting system can avoid using a plurality of terahertz frequency sources, reduces the complexity of a terahertz array receiver, and is simple in structure, convenient to process, low in cost and high in diffraction efficiency.

Description

technical field [0001] The present invention relates to the technical field of terahertz wave imaging, in particular to a terahertz wave beam splitting system. Background technique [0002] Compared with visible light and infrared rays, terahertz waves can penetrate non-polar and weakly polar dielectric materials with little attenuation, which makes terahertz imaging capable of working around the clock and detecting dangerous objects hidden under clothing, and There is no problem that the weight of the microwave imaging system is too heavy and the volume is too large. In security, astronomy, military and other fields, terahertz imaging requires sufficient channel capacity, high imaging speed and efficiency, so the use of multi-channel array receivers is particularly important. [0003] In order to achieve array reception in the terahertz frequency band, if an independent local oscillator source is provided for the mixer of each channel, due to the high cost of terahertz com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3581G01N21/01G01V8/10
CPCG01N21/3581G01N21/01G01V8/10
Inventor 杨非彭双王昆
Owner SOUTHEAST UNIV
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