为了评估羰基铁材料在太赫兹波段的屏蔽性能，采用太赫兹时域光谱技术分别对参考样品、0.5 mm羰基铁样品和1 mm羰基铁样品进行了透射光谱测量。分析表明，随着羰基铁样品厚度的增加，太赫兹时域光谱脉宽增加、峰值减小，频域光谱范围减小。羰基铁样品的最大屏蔽效能为66 dB左右。0.5 mm和1 mm羰基铁样品的屏蔽效能大于60 dB的区间分别是0.76 THz～1.46 THz和0.49 THz～1.48 THz。

To assess the shielding property of carbonyl iron material at terahertz wavelengths, the transmission spectra of reference samples, 0.5 mm carbonyl iron samples and 1 mm carbonyl iron samples were measured respectively by a Terahertz Time-domain Spectroscopy (THz-TDS). The analysis showed that with the increase of the thickness of the carbonyl iron samples, the pulse width of the terahertz time-domain spectrum would increase, its peak value would decrease and the frequency domain spectral range would be reduced. The carbonyl iron samples had their maximum shielding effectiveness of about 66 db. The wavelength ranges in which the 0.5 mm and 1 mm carbonyl iron samples had the shielding effectiveness greater than 66 db are those from 0.76 to 1.46 THz and from 0.49 to 1.48 THz respectively.