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Manwei Chen

As seen in: Optica
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Articles

In situ online deflectometry with synchronized calibration and measurement

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By Zekun Zhang, Ruiyang Wang, Shouhuan Zhou, Manwei Chen
| Optica Verified
Delicate calibration is essential for high-accuracy deflectometric measurements of specular surfaces. However, traditional methods rely on assumptions that can introduce significant systematic errors, particularly regarding system stability throughout the calibration-measurement process. This Letter proposes a synchronized calibration and measurement method for deflectometry, effectively tackling the instability-induced systematic error.
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Frequency-domain searching algorithm in deflectometry for measuring the surface of a transparent planar element

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By Zekun Zhang, Ruiyang Wang, Wanxing Zheng, Manwei Chen
| Optica Verified
This Letter presents the frequency-domain searching algorithm in deflectometry (FSAD). By encoding specialized multi-frequency fringe patterns and employing a correlation searching algorithm, the limitations of existing frequency-domain methods can be overcome to some extent, thereby separating front and back surface reflections to obtain complete measurement data. The principles of FSAD are described in detail.
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