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Data Acquisition Method for Terahertz Pulse Rapid Imaging

A terahertz pulse and data acquisition technology, which is applied to the measurement of scattering characteristics, transmittance measurement, etc., can solve the problems of large amount of data processing, time-consuming and labor-intensive terahertz pulse imaging technology, and achieve the effect of shortening and saving time

Inactive Publication Date: 2011-12-28
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The present invention aims to provide a new data acquisition method for terahertz pulse fast imaging to solve the technical problems of the existing terahertz pulse imaging technology, such as time-consuming and labor-intensive, large amount of data processing, etc.

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  • Data Acquisition Method for Terahertz Pulse Rapid Imaging
  • Data Acquisition Method for Terahertz Pulse Rapid Imaging
  • Data Acquisition Method for Terahertz Pulse Rapid Imaging

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Embodiment Construction

[0028] The present invention proposes a method for selectively acquiring imaging data to be measured by minimizing the movement of the optical delay line. Because this method discards the acquisition of a large amount of other information data that is irrelevant to the final imaging result, the speed of terahertz pulse imaging data acquisition is greatly improved.

[0029] In the present invention, it is first necessary to arbitrarily select a position to be measured on the imaging sample (denoted as a reference sample point S), and perform full waveform detection in the time domain range of the terahertz pulse, so as to obtain the transmission or reflection of the reference sample point Time-domain pulses, such as image 3 Position1 line is shown. Then, through real-time analysis of the pulse data, find out the maximum value and minimum value of the pulse amplitude in the time domain, and record the time position T corresponding to the maximum value and minimum value A , T ...

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Abstract

The invention provides a new method for acquiring a data for rapid terahertz pulse imaging. The new method is used for solving the technical problems of the existing terahertz pulse imaging process that time and labor are wasted, data handling capacity is huge, and the like. According to the new method, the movement of optical delay lines is reduced as much as possible and a to-be-measured imaging data is selectively acquired at maximum amplitude value and minimum amplitude value. According to the new method, a process of acquiring a large amount of other information data irrelevant to a final imaging result is abandoned, thereby greatly promoting the speed of acquiring the data for terahertz pulse imaging.

Description

technical field [0001] The invention relates to a fast image data acquisition method in the material imaging process using terahertz time-domain pulses. Background technique [0002] Terahertz (THz for short) mainly refers to the electromagnetic radiation band with a frequency of 0.1 to 10 THz (wavelength of 0.03 mm to 3 mm), located between microwaves and infrared rays. The wavelength band of terahertz waves is very special. It is not only the transition zone from macroscopic classical theory to microscopic quantum theory, but also the transition zone from electronics to photonics. Its generation and detection methods have long been the focus of research. In 1984, Grischkowsky first successfully generated terahertz waves using photoconductive antennas, which laid the foundation for the development of terahertz-related technologies; in 1995, X.C. Zhang proposed the free-space electro-optic sampling method, which achieved high signal-to-noise of terahertz waves In the same y...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/47G01N21/59
Inventor 范文慧薛冰梁玉庆
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI