Harris Zachery B, Khani Mahmoud E, Arbab M Hassan
Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY 11794, USA.
IEEE Access. 2020;8:228024-228031. doi: 10.1109/access.2020.3045460. Epub 2020 Dec 17.
We report on the development and characterization of a handheld terahertz (THz) time-domain spectroscopic scanner for broadband imaging between approximately 0.25 and 1.25 THz. We designed and fabricated a 3D-printed fiber-coupled housing which provides an alignment-free strategy for the placement and operation of the THz optics. Image formation is achieved through telecentric beam steering over a planar surface through a custom f- scanning lens. This design achieves a consistent resolution over the full 12 × 19 mm field of view. Broadband spectral imaging is demonstrated using a 1951 United States Air Force Resolution Test Target. The consistency of the resolution over the wide field is validated through Boehler Star resolution measurements. Finally, a practical scenario of subsurface imaging on a damaged section of an aircraft wing is demonstrated. The THz PHASR is a field-deployable imaging system with the versatility to be applied to a much broader range of targets and imaging scenarios than previously possible, from industrial non-destructive testing to clinical diagnostic imaging.
我们报告了一种用于在约0.25至1.25太赫兹之间进行宽带成像的手持式太赫兹（THz）时域光谱扫描仪的开发与特性。我们设计并制造了一个3D打印的光纤耦合外壳，该外壳为太赫兹光学器件的放置和操作提供了一种无需对准的策略。通过一个定制的f扫描透镜在平面上进行远心光束转向来实现图像形成。这种设计在整个12×19毫米视场范围内实现了一致的分辨率。使用1951年美国空军分辨率测试靶标展示了宽带光谱成像。通过Boehler星分辨率测量验证了宽视场范围内分辨率的一致性。最后，展示了在飞机机翼受损部位进行地下成像的实际场景。太赫兹PHASR是一种可现场部署的成像系统，与以前相比，具有通用性，可应用于更广泛的目标和成像场景，从工业无损检测到临床诊断成像。
