研究目的
To address the issues of multi-reflection between reflectors and the distortion of echo signals from targets distributed in a broader area in terahertz imaging, and to verify the efficiencies of these proposals by an imaging experiment with five metal cylinders.
研究成果
The efficiency of correlating synthesis method in improving the resolution and eliminating the fake images has been verified. The influence of the multi-reflection and the possibility of broader range imaging by using the correlating synthesis method were studied. An artifact image appeared between two reflectors is verified to be the result of multi-reflection, and it can be eliminated to some extent by using VV mode polarization. The efficiency of concave lenses for measuring multiple reflectors distributed in broader area was verified.
研究不足
The study is limited by the non-linearity of the imaging method and the distortion of echo signals caused by the directivity of the THz beam. The use of concave lenses to correct these issues is explored.
1：Experimental Design and Method Selection:
The study employs a correlating synthesis method for terahertz imaging using a pulse reflection mode terahertz time-domain spectrometry system. Numerical simulations and experiments with metal cylinders are conducted to verify the method's efficiency.
2：Sample Selection and Data Sources:
Metal cylinders with a uniform diameter of 2 mm are used as reflectors of THz-waves. The sample metal cylinders are free standing perpendicular to the x–y plane in the imaging area.
3：List of Experimental Equipment and Materials:
A THz pulse transmitter and receiver are used, along with concave lenses to broaden the directivity of THz wave.
4：Experimental Procedures and Operational Workflow:
The transmitter is located at a fixed angle, and the receiver is moved along a circular arc. The sample is set in an imaging area, and the position of the sample is aligned in the x–y plane.
5：Data Analysis Methods:
The CS imaging method calculates the correlation between signals in a subarray by multiplying the corresponding delayed signals, and then synthesizes the results of these correlations to acquire an image.
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