In-plane ESPI with unlimited angle of view for multi-object rotation angle determination

Author:

Jiang Hanyang1ORCID,Wang Jingwei,Yang Boshuo2,Dai Meiling3,Peng Guangjian,Yang Fujun1,He Xiaoyuan1

Affiliation:

1. Southeast University

2. National University of Singapore

3. Guangdong University of Technology

Abstract

The in-plane electronic speckle pattern interferometry (ESPI), implemented in a Michelson stellar interferometer-like configuration, offers high sensitivity and dynamic measurement. However, its limited angle of view (AOV) remains a major challenge for the rotation angle determination of multiple objects. In this Letter, we analyze the main factors that influence the AOV of the in-plane ESPI and propose an “image transmitting” approach to enlarge the AOV. With the aid of a folded dual-telescope imaging system, we develop an AOV-unlimited interferometer that can determine multi-object rotation angles in real time. The practicability of the interferometer is demonstrated by the application in real-time measuring of the rotation angles of the disks within a 2D granular system.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Zhejiang Province

Fundamental Research Funds for the Provincial Universities of Zhejiang

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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