Terahertz time-domain spectroscopy complete polarization electromagnetic scattering measurement system and acquisition method

Abstract

The invention discloses a terahertz time-domain spectroscopy complete polarization electromagnetic scattering measurement system and acquisition method. According to the method, HH transceiving polarization, HV transceiving polarization, VH transceiving polarization and VV transceiving polarization are achieved by the aid of a terahertz time-domain spectroscopy complete polarization target electromagnetic scattering measurement system. The system mainly comprises a femtosecond laser source, a terahertz transmitting source, a terahertz wave beam collimation system, a target turntable system, aterahertz wave polarization control system, a terahertz wave detection system and a data acquisition and control system, a transceiving polarization mode is determined by adjusting rotating directionsof a hertz polarizer and a femtosecond laser half-wave plate, so that a turntable and a time delay line are controlled, and target polarization terahertz time-domain spectroscopy scattering signals under different postures are acquired in a scanned manner. According to the system, scattering characteristic measurement of target complete polarization RCS and 3D (three-dimensional) ISAR and the like within a terahertz high-frequency point and large-spectrum width range can be achieved, and the mechanical stability of the system is further ensured.

Description

technical field [0001] The invention relates to electromagnetic scattering testing technology, in particular to a terahertz time-domain spectrum full-polarization electromagnetic scattering measurement system and method. Background technique [0002] When the electromagnetic scattering test system is used to measure the RCS of the target, it is usually necessary to obtain the backward single-station RCS data of the target for evaluation of target scattering characteristics, target identification, etc. The Radar Cross Section (RCS, Radar Cross Section) that obtains the fully polarized electromagnetic scattering signals of the target, that is, HH, HV, VH, and VV, can reflect the structure and material of the target through different polarization characteristics. Detailed information. [0003] In the terahertz band, the existing technologies for obtaining target full-polarization scattering signals are mainly based on electronic frequency doubling links and network vector anal...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a terahertz time-domain spectrum full-polarization electromagnetic scattering measurement system and method, which can overcome or improve that the time-domain spectrum RCS measurement system cannot provide full-polarization target scattering characteristics measurement, and the electronic RCS measurement cannot cover High-frequency, terahertz gas laser RCS measurement frequency points are few and the spectral width is small

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