采用太赫兹时域光谱(THz-TDS)技术对受到不同程度热损伤的氟橡胶材料进行检测,获得各样品在0.4~1 THz波段的时域光谱、频域光谱和吸收谱。结果发现,氟橡胶材料的太赫兹特征谱段介于-382~-376 ps之间。进一步对不同程度热损伤样品的太赫兹特征谱段的最大值、峰峰值和吸收系数进行对比和拟合分析,结果发现,氟橡胶材料特征谱段的最大值、峰峰值和吸收系数均与热损伤温度存在良好的线性关系,相关系数可达0.9614。研究结果可为氟橡胶材料的太赫兹无损识别和热损伤定量检测提供参考。

Terahertz time-domain spectroscopy technology was applied to detect fluororubber materials with different degrees of thermal damages to acquire the time-domain spectrum, frequency-domain spectrum and absorption spectrum of each sample in 0.4-1 THz band. The experimental results showed that the terahertz spectrum of fluororubber materials was between -382 ps and -376 ps. Further comparison and fitting analysis of the maximum value, peak-to-peak value, and absorption coefficient of terahertz characteristic spectrum of different degrees of thermal damage samples indicated that these values had good linear relationships with the temperature of the thermal damage, in which the correlation coefficient could reach 0.9614. The results could provide a reference for terahertz nondestructive identification and quantitative detection of thermal damage for fluororubber materials.