Work

Vibration Deformation Measurement and Defect Identification Based on Time-Averaged Digital Holography

Year: 2025

Type: article

Abstract: Based on time-averaged digital holography, a vibration deformation measurement system was designed and a full process reconstruction and identification strategy was developed for detecting the micro-defects in optical materials. Through the double beam expansion setting and off-axis imaging adjustments, it is suitable for measuring optical materials with non-specular surfaces by double exposure shots. The scheme was applied to optical sandwich composites and 3D printed glass. Abnormal amplitudes occur at the defects due to different resonance frequencies, resulting in anomalous vibrations under excitation, and the differences in the amplitudes and phases before and after vibration can effectively characterize vibration amplitude and subsurface defects, proving that this method has a high detecting sensitivity.

Source: Photonics

DOI: 10.3390/photonics12040373

Authors: Dongyang Hu, Chen Wang, Di Li, Weiyu Xu, Xiangchao Zhang

Institutions: Fudan University, Aviation Industry Corporation of China (China)

Language: English

Topic: Digital Holography and Microscopy

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funder: National Natural Science Foundation of China