Terahertz continuous wave scanning imaging system and method

Abstract

The invention discloses a Terahertz continuous wave scanning imaging system and method. The system comprises a vector network analyzer which is connected to a frequency spread module, a scanning stageand an upper computer separately, and the scanning stage is connected to the upper computer; the frequency spread module is placed on a lifting table, and the lifting table is used for adjusting thehorizontal and vertical position of the frequency spread module away from a test sample; the test sample is fixed to the scanning stage; the upper computer scans parameters, sends a scanning order andcontrols movement of the scanning stage by configuring test samples; the upper computer completes parameter setting of the vector network analyzer, reading of S parameters and test sample scanning imaging display. Accordingly, the upper computer does not need to perform interactive communication with the scanning stage to obtain position coordinates of sampling points, the upper computer obtainsgrayscale images through the methods such as line scanning point number control, data rearrangement and gray value dynamic stretching, the communication link is simplified, the system scanning time isshortened, and the imaging efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of terahertz wave imaging, in particular to a terahertz continuous wave scanning imaging system and method. Background technique [0002] Terahertz Wave (THz for short) usually refers to electromagnetic waves with a frequency between 0.1 and 10 THz (wavelength between 0.03 mm and 3 mm), which can penetrate most non-polar materials, and can penetrate opaque non-polar materials. Imaging of sensitive substances to detect their internal structure and defects. [0003] Most terahertz continuous wave scanning imaging systems use solid-state electronic frequency doubling methods to generate terahertz sources. Integrate optoelectronic devices such as signal sources, phase-locked sources, drivers, frequency multipliers, couplers, mixers, and detectors together to realize the functions of receiving and sending terahertz waves. The system is highly integrated, but the output terahertz beam bandwidth is narrow, and it...

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Problems solved by technology

The system is highly integrated, but the output terahertz beam bandwidth is narrow, and it is mostly used for point-frequency imaging, and the spectral characteristics of the test sample cannot be obtained

[0004] The transmission of terahertz waves and the reception of echo signals can be realized by using a microwave vector network analyzer and a spread spectrum module, but in the measurement process of S parameters (S11, S21, S12, S22), it is generally necessary to manually set the vector network analyzer various parameters; to realize the imaging algorithm, it is necessary to copy the signal data to the computer for analysis and calculation through a mobile storage device, and the operation efficiency is relatively low

At the same time, repeated manual operations and data copying of the vector network analyzer are likely to cause wear and tear on the instrument, and failure to use the protection of the instrument

[0005] In the existing terahertz continuous wave continuous scanning imaging system using S parameters, at the moment of s

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