IEEE transactions on terahertz science and technology. 2022 Mar;12(2):151-164. doi: 10.1109/tthz.2021.3140199 Q23.92024

650 GHz imaging as alignment verification for millimeter wave corneal reflectometry

650GHz成像作为毫米波角膜反射计的对准验证方法翻译改进

Yong Hu¹, Mariangela Baggio², Shahab Dabironezare³, Aleksi Tamminen², Brandon Toy⁴, Juha Ala-Laurinaho², Elliott Brown⁵, Nuria Llombart³, Sophie X Deng⁶, Vincent Wallace⁷, Zachary D Taylor²

作者单位 +展开

作者单位

¹ Department of Bioengineering, University of California, Los Angeles, CA 90095 USA.

² Department of Electronics and Nanoengineering, Aalto University, Espoo, FI-02150, Finland.

³ Center for Wireless Systems and Technology, Delft University of Technology, 2628 CD Delft, The Netherlands.

⁴ Electrical and Computer Engineering Department, University of California, Los Angeles, CA 90095 USA.

⁵ College of Engineering and Computer Science, Wright State University, Dayton, OH, 45435, USA.

⁶ Cornea Division, University of California, Los Angeles, 90095-1436, USA.

⁷ Department of Engineering and Mathematical Sciences, University of Western Australia, Crawley, WA, 6009, Australia.

DOI: 10.1109/tthz.2021.3140199 PMID: 36185397

摘要 Ai翻译

A system concept for online alignment verification of millimeter-wave, corneal reflectometry is presented. The system utilizes beam scanning to generate magnitude-only reflectivity maps of the cornea at 650 GHz and compares these images to a precomputed/measured template map to confirm/reject sufficient alignment. A system utilizing 5 off-axis parabolic mirrors, a thin film beam splitter, and 2-axis galvanometric mirror was designed, simulated, and evaluated with geometric and physical optics. Simulation results informed the construction of a demonstrator system which was tested with a reference reflector. Similarity metrics computed with the aligned template and 26 misaligned positions, distributed on a 0.5 mm x 0.5 mm x 0.5 mm mesh, demonstrated sufficient misalignment detection sensitivity in 23 out of 26 positions. The results show that positional accuracy on the order of 0.5 mm is possible using 0.462 mm wavelength radiation due to the perturbation of coupling efficiency via beam distortion and beam walk-off.

Keywords: Biological and medical imaging; THz imaging of cornea; clinical instruments; medical diagnostics.

Keywords：alignment verification

关键词：对准验证