Current terahertz time-domain spectroscopy (THz-TDS) theory and techniques are limited with respect to adequately and directly characterizing the layered structure information in dynamic deposition. We exploited a THz single-scan measurement and extraction method for the dynamic information in a layered deposition. The layer numbers, thickness and the deposition velocity can be simultaneously characterized with a single THz scan in a one-by-one deposition. Based on that, the THz-TDS can reveal the thickness information of a polycarbonate sheet with a continuously changing thickness. To demonstrate this, multiple layers of slices were measured. The layers were determined to have a special THz waveform that did not possess complete signals, while the THz-TDS clearly reflected the velocity and thickness of each sample in the process of superposition. The THz-TDS of the layered structures had multiple peaks. Thus, the layered structure information such as the insertion velocity and layers could be obtained for any condition. Consequently, we believe that a precise measurement carried with a THz single scan can help in improving online detection for deposition in the material science and petroleum industry.

当前的太赫兹时域光谱学（THz-TDS）理论和技术在动态沉积中充分，直接地表征层状结构信息方面受到限制。我们利用THz单扫描测量和提取方法来获取分层沉积中的动态信息。层数，厚度和沉积速度可以在一对一的沉积中通过一次THz扫描同时表征。基于此，THz-TDS可以显示厚度连续变化的聚碳酸酯板的厚度信息。为了证明这一点，测量了多层切片。确定这些层具有不具有完整信号的特殊THz波形，而THz-TDS清楚地反映了叠加过程中每个样本的速度和厚度。分层结构的THz-TDS具有多个峰。因此，可以在任何条件下获得分层结构信息，例如插入速度和层数。因此，我们相信使用THz单次扫描进行的精确测量可以帮助改善材料科学和石油工业中沉积物的在线检测。