对太赫兹时域光谱成像在时域和频域两种模式下不同处理方法进行了研究。太赫兹波时域光谱成像技术与一般的强度成像不同, 它具有信息量大、同时含有振幅和位相信息等显著特点。根据不同需求, 可以选取不同的物理量来展示不同的成像特征, 以便提供更多、更精确的样品信息。每一个像素点对应一个时域波形, 可以从时域信号或它的傅里叶变换谱中选择任意数据点的振幅或位相进行成像, 从而重构样品的空间密度分布、折射率和厚度分布。在频域模式下以不同频率点的振幅、吸收率、折射率、功率作为参数进行成像, 进行了太赫兹波多光谱成像技术的初步研究。这些研究结果对提高太赫兹成像的分辨率和太赫兹图像识别有着重要的意义。

The method of image processing of terahertz time-domain spectral imaging in the time-domain and frequency-domain is discussed. Compared to other intensity imaging, terahertz time-domain spectral imaging technology has an obvious advantage that it has a large amount of information. According to different requirements, different image characteristics are demonstrated by selecting different physical parameters in order to provide more accurate sample information. Each pixel corresponds to a time-domain waveform so that any amplitude or phase data point from the time-domain signal or its Fourier transform spectrum can be used to make graphs to remodel the space density distribution, the refractive index and the thickness distribution of samples. It is worth mentioning that, in the frequency-domain model, graphs can be made by different parameters at each frequency, such as amplitude, absorption, refractive index, energy, power and so on, which can be used to investigate the terahertz multi-spectral imaging technology. The results of these researches have important significance to improve the resolution of THz imaging and THz image recognition technology.