Optical fiber coupling terahertz time-domain spectroscopy testing system

Abstract

The invention relates to an optical fiber coupling terahertz time-domain spectroscopy testing system. Lasers emitted by a laser device are reflected by a reflector set to enter a main optical fiber coupling system, the lasers are divided into two paths of light signals through the optical fiber coupling system, one path of light signals is input into an independent optical fiber coupling terahertz emitter through emitter transmission optical fibers for generating terahertz signals, and the other path of light signals is input into an independent optical fiber coupling terahertz receiver through receiver transmission optical fibers for detecting the terahertz signals. The independent optical fiber coupling terahertz emitter and the independent optical fiber coupling terahertz receiver are installed on a two-dimensional imaging movable platform, terahertz emitted by the independent optical fiber coupling terahertz emitter penetrates through a sample or is reflected by the sample to enter the independent optical fiber coupling terahertz receiver, and the sample is tested or imaged. The system can be freely switched between multiple modes according to sample characteristics. The system has the advantages of being rarely limited by space, supporting measuring and imaging of large-size and irregular-size samples, and being good in imaging effect.

Description

technical field [0001] The invention relates to an electromagnetic spectrum test technology, in particular to a fiber-coupled terahertz time-domain spectrum test system. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency between 0.1 and 10 THz, which lie between microwaves and infrared rays on the electromagnetic spectrum. Due to the position of the special electromagnetic spectrum where the terahertz wave is located, it has many superior characteristics and can be used in the analysis of special spectral information of material molecules, non-destructive testing and three-dimensional tomography of materials and structures, anti-terrorism inspection of prohibited items, and detection of biological tissues. Research on biopsy, high-precision confidential radar, broadband communication between satellites, etc. The spectral information detected by the terahertz spectrometer can obtain the optical amplitude and phase information of the...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems that current terahertz time-domain systems usually have relatively large volume, complex structure, high cost, lack of flexible mobility, and are easily affected by the environment, and proposes a fiber-coupled terahertz time-domain spectrum testing system, which can The test mode can be switched freely, the signal-to-noise ratio is high, and it has the function of terahertz imaging, and the imaging effect is good. It can be widely used in terahertz spectrum testing and imaging in scientific research and industrial fields

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