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实现了基于光泵浦远红外气体激光器和高莱管探测器的连续波太赫兹成像.从太赫兹光学器件的选择和配置角度讨论了成像系统的设计和搭建流程.详细测试了系统在信噪比、空间分辨率、探测器响应和成像速度方面的性能指标.利用该系统采集了一系列样品的太赫兹透射图像,实验结果验证了系统的成像效果,揭示出太赫兹成像技术在安全检查和质量控制方面的应用可行性.为了消除激光器功率漂移对图像质量的影响,提出了一种对图像背景区强度进行自动校准的数据处理方法.
The continuous wave terahertz imaging based on optically pumped far-infrared gas laser and high-beam-tube detector is realized.The design and setup process of the imaging system are discussed from the point of view of the choice and configuration of terahertz optics.A detailed test of the system in terms of signal-to-noise Ratio, spatial resolution, detector response and imaging speed, the terahertz transmission images of a series of samples were collected by the system. The experimental results verify the imaging performance of the system and reveal the advantages of terahertz imaging in safety inspection and In order to eliminate the influence of power drift of laser on the image quality, a data processing method of automatically calibrating the background intensity of the image is proposed.