Abstract
This paper presents improved digital shearing speckle pattern interferometry based on Rochon Prism. The advantage of this method is that it avoids the shadow noise caused by transmission light, which improves the shearography accuracy. By reducing the angle of divergence and coordinating the measuring distance and the precision coordinate, the beam-splitting path of the interference optical path is improved. Experimental results prove that the improved method contributes to the practical and instrumental application of shearography.
Highlights
It has been nearly 40 years since Hung and Leendertz introduced shearography [1,2]
We introduced a shearographic measurement system based on the Wollaston Prism (WP) and the temporal wavelet transformation (TWT) [10]
We proved the feasibility of combining the polarization splitting effect with the electro-optical crystal materials in temporal heterodyne shearing speckle pattern interferometry [11]
Summary
It has been nearly 40 years since Hung and Leendertz introduced shearography [1,2]. As an important optical measurement method, shearography has been widely used in the fields of shape measurement [3], vibration analysis [4,5], and strain detection [6,7,8]. The polarization splitting effect of WP is not specially perfect under an illuminant of high intensity, and the lights emergent from the prism are an e-o light and an o-e light, and a transmission light, which confuse the interference signals and reduce the signal-to-noise ratio (SNR) and the image contrast [12]. To solve these problems, we introduced the Rochon Prism (RP) to replace the WP. Sci. 2019, 9, 2554 results show that the RP meets the shearographic requirements and improves the accuracy of the measurement system
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