Stitching interferometry using alternating calibration of positioning and systematic errors

• DOI: 10.1364/oe.521791
• Publication Date: 2024-04-10T09:00:10Z
• Authors: Yi Zong; Caiyun Yu; Weijian Liu; Yixuan Liu; Yongshen Zhong; Huitong Huang; Mingliang Duan; Jianxin Li
• Keywords: Image stitching

Stitching interferometry is an essential technique for the non-contact, high-precision measurement of large apertures or complex optical surfaces. However, accuracy full-aperture surface reconstruction significantly compromised by subaperture positioning and systematic errors. To address this challenge, study introduces a novel stitching method utilizing alternating calibration errors (SIAC). This calibrates one type error while maintaining other constant, alternates between these processes to effectively decouple two errors, facilitating accurate phase stitching. Within framework, iterative weighted model employing vertical projection estimating overlapping areas was developed calibrate Additionally, rotation measurements single subaperture, in conjunction with global fitting approach, were employed correct reference Numerical simulations have confirmed efficacy SIAC calibrating Moreover, experimental performed on both plane mirror gullwing aspheres, resulting stitched distributions cross-testing outcomes affirming method's practicality. research provides solution interferometry, enhancing precision measurements.