Efficient ESPI method to identify vibration characteristics of transparent films

作者：Yinhang Ma, Hanyang Jiang, Hao Cheng, Minyang Wu, Xiaoyuan He, Fujun Yang · 发表于：Optics Letters · 年份：2021 · DOI：10.1364/ol.439450 · 被引用次数：8 · 研究领域：Optical measurement and interference techniques、Surface Roughness and Optical Measurements、Advanced Measurement and Detection Methods

Electronic speckle pattern interferometry (ESPI) has been frequently used to study vibration characteristics of engineering structures. However, efficient ESPI methods for identifying the vibration characteristics of transparent membranes are rarely reported. A convenient approach to determine the resonant frequencies and the vibration modes of transparent films is proposed. A quasi-common-path ESPI (QCP-ESPI) is developed to detect out-of-plane deformation and visualize vibrational modes of a vibrating transparent diaphragm. An amplitude-modulation-based method is proposed for quick and accurate determining resonance of oscillating objects during frequency scanning. Experimental performances demonstrate the feasibility and efficiency of the QCP-ESPI and amplitude-modulation-based methods for determining the resonant frequency and vibration modes of transparent objects.