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聚甲基丙烯酰亚胺(polymethacrylimide,PMI)泡沫复合材料具有众多优良特性,被广泛应用于航天航空、军工、船舶、汽车及高速列车等各个领域。而作为新型的夹层结构材料,其太赫兹(Terahertz,THz)波段的性能检测尚未见报道。基于THz时域光谱分析方法,对国内外两种型号的PMI泡沫复合材料在太赫兹波段透射及反射的实验获得的时域波形、功率密度谱进行了分析比较,基于MATALB编程、Origin8.0数据处理,应用时域、频域方法计算分析了不同厚度的德固赛(型号:Rohacell WF71)、美沃科技发展有限公司生产的(型号:SP1D80-P-30)PMI泡沫复合材料的透射率(传输函数)、吸收率、反射率以及折射率等光学参数。研究结果表明:通过对比空气、氮气中的不同测量结果,解释了湿度对测量结果的影响。PMI泡沫复合材料的折射率为1.05左右,功率谱的衰减是由于测试平台本身信号较弱、样品较厚且PMI泡沫的内部微结构的散射,造成THz波在>0.6THz波段表现出明显的衰减。该结论为THz波段在PMI泡沫复合材料方面的应用提供了理论依据,同时也为太赫兹无损探伤(non-destructive testing,NDT)技术在PMI泡沫复合材料方面的应用做了一个良好的铺垫。
Polymethacrylimide (PMI) foam composites have many excellent properties and are widely used in aerospace, military, shipbuilding, automotive and high-speed trains and other fields. As a new type of sandwich material, the terahertz (THz) band performance detection has not been reported yet. Based on the THz time-domain spectroscopic analysis, time-domain waveforms and power density spectra of two types of PMI foam composites at home and abroad were analyzed and compared in terms of transmission and reflection in the terahertz band. Based on MATALB programming, Origin8.0 data The transmittance of PMI foam composites (model No .: SP1D80-P-30) manufactured by Meowo Technology Development Co. Ltd. (Rohacell WF71) with different thicknesses was calculated and analyzed by using the time domain and frequency domain methods Transfer function), absorption, reflectivity and refractive index and other optical parameters. The results show that: By comparing the different measurements in air and nitrogen, the influence of humidity on the measurement results is explained. The refractive index of PMI foam composites is about 1.05. The attenuation of the power spectrum is due to the weak signal of the test platform itself, the thicker sample and the scattering of the internal microstructure of the PMI foam, resulting in a significant attenuation of the THz wave in the> 0.6 THz band . This conclusion provides a theoretical basis for the application of THz band in PMI foam composites and a good foundation for the application of THT non-destructive testing (NDT) technology in PMI foam composites.