Abstract Using digital holography technology to reconstruct the optical information of the calibrated grating, the grating pattern can be magnified without an optical lens. This greatly reduces the volume and complexity of the image angular displacement measurement device. This paper proposes an angular displacement measurement technology based on in-line digital holographic reconstruction. The wavefront recording of the calibrated grating holographic interference fringes can be realized in a small volume; the wavefront is reconstructed via algorithm, then the coded information on the calibrated grating is recognized based on the reconstructed light wave. The recognition and angle calculation of coded lines was successful in an experiment on 1024 period calibrated circular gratings, and 1.24ʺ measurement resolution is achieved by the subdivision algorithm. This study may represent a workable foundation for future small-volume and high-resolution angular displacement measurement technology.

中文翻译：

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基于在线数字全息重建的角度测量

摘要 利用数字全息技术重构校准光栅的光学信息，无需光学透镜即可放大光栅图案。这大大降低了图像角位移测量装置的体积和复杂性。本文提出了一种基于在线数字全息重建的角位移测量技术。可在小体积内实现校准光栅全息干涉条纹的波前记录；通过算法重建波前，然后根据重建的光波识别校准光栅上的编码信息。编码线的识别和角度计算在1024个周期校准圆光栅的实验中成功，1. 24ʺ 测量分辨率是通过细分算法实现的。这项研究可能代表未来小体积和高分辨率角位移测量技术的可行基础。