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Interferometric autocollimator based on full-field heterodyne phase-shifting interferometry

Year: 2026

Type: article

Abstract: This paper presents an interferometric autocollimator based on full-field heterodyne phase-shifting interferometry (HPSI) for high-precision small-angle measurement. An oblique fiber in combination with an autocollimating objective lens is employed as the autocollimation module to generate both the reference and measurement beams. The oblique fiber serves not only as a point light source and a beam splitter, but also as a position-sensing element that ensures the reference beam retraces the incident path, thereby establishing the autocollimation condition and resulting in a compact and self-consistent system architecture. Heterodyne phase-shifting interferometry is incorporated to retrieve the wavefront difference between the reference and measurement beams, enabling accurate determination of angular deviations. In addition, a fiber-coupling efficiency model is developed to evaluate the system error, and experiments are conducted to verify the feasibility and high-resolution performance of the proposed system.

Source: Optics Express

DOI: 10.1364/oe.592592

Authors: Yongjie Wang, Conghui Zhu, Anqi Liu, Wenxi Zhang

Institutions: Chinese Academy of Sciences, Aerospace Information Research Institute

Language: English

Topic: Optical measurement and interference techniques

Subfield: Computer Vision and Pattern Recognition

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: Chinese Academy of Sciences