Method for testing freeform surfaces based on a Shack-Hartmann sensor with plane wavefront scanning and stitching

doi:10.1364/OE.503494

CIOMP OpenIR

	Method for testing freeform surfaces based on a Shack-Hartmann sensor with plane wavefront scanning and stitching
	J. Wang, X. Wang, L. Peng, J. Wang, Z. Liu, L. Li, M. Cai, B. Liu, W. Li and X. Zhang
	2023
发表期刊	Optics Express
ISSN	10944087
卷号	31 期号:22 页码:36702-36724
摘要	Currently, the surface error measurement technology for freeform faces a significant contradiction between measurement accuracy and dynamic range. The study proposes a non-null testing method for measuring freeform surfaces by utilizing a Shack-Hartmann wavefront sensor to emit a small aperture parallel beam and scan along the normal direction at the center of subapertures for stitching (SHPSS). A mathematical model based on ray tracing and the reflection theorem is established to calculate the sampling points on an ideal freeform surface, the reference spot array on CCD, and the corresponding relationship between microlens array and spots. An algorithm is proposed to iteratively calculate the wavefront aberration and gradually approach the actual sampling points using the established model. Theoretical analysis and numerical simulation results indicate that SHPSS can increase the dynamic range and improve the accuracy of wavefront reconstruction. The error analysis of the SHPSS method is carried out, the measurement accuracy of full aperture freeform surface is 11.45 nm. A testing system is set up and experiments are conducted on a 100 mm aperture freeform reflective mirror. The RMS of the SHPSS test results is less than λ/30 (λ=635 nm) compared to the interferometric test results. By analyzing five groups of repeated measurement experiments, the repeatability accuracy of SHPSS method is less than 1/80 λ (RMS). This demonstrates the feasibility and measurement capabilities of the method for freeform surface testing. © 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.
DOI	10.1364/OE.503494
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收录类别	ei
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/67939
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	J. Wang, X. Wang, L. Peng, J. Wang, Z. Liu, L. Li, M. Cai, B. Liu, W. Li and X. Zhang. Method for testing freeform surfaces based on a Shack-Hartmann sensor with plane wavefront scanning and stitching[J]. Optics Express,2023,31(22):36702-36724.
APA	J. Wang, X. Wang, L. Peng, J. Wang, Z. Liu, L. Li, M. Cai, B. Liu, W. Li and X. Zhang.(2023).Method for testing freeform surfaces based on a Shack-Hartmann sensor with plane wavefront scanning and stitching.Optics Express,31(22),36702-36724.
MLA	J. Wang, X. Wang, L. Peng, J. Wang, Z. Liu, L. Li, M. Cai, B. Liu, W. Li and X. Zhang."Method for testing freeform surfaces based on a Shack-Hartmann sensor with plane wavefront scanning and stitching".Optics Express 31.22(2023):36702-36724.

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