Laser & Optoelectronics Progress, Volume. 57, Issue 3, 031201(2020)
Defect Detection in Mirror-Like Object Surface Based on Phase Deflection
To detect defects on mirror-like object surfaces in the modern manufacturing industry, an automatic detection method based on phase measuring deflectormetry is proposed. The phase of the reflected image is extracted by combining the phase shift and Gray code, and defects are identified by an analysis of local phase irregularities. In addition, the phase extraction error that leads to false detection is analyzed. A wrapped phase period index correction algorithm is proposed to prevent period misalignment during the phase unwrapping. Therefore, accurate phase extraction can be assured through the phase unwrapping algorithm, and false detection is avoided. Experimental results indicate that the proposed method can accurately and reliably detect mirror-like surface defects.
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Shuo Jiang, Linghui Yang, Yongjie Ren, Jigui Zhu. Defect Detection in Mirror-Like Object Surface Based on Phase Deflection[J]. Laser & Optoelectronics Progress, 2020, 57(3): 031201
Category: Instrumentation, Measurement and Metrology
Received: Jun. 3, 2019
Accepted: Jul. 26, 2019
Published Online: Feb. 17, 2020
The Author Email: Zhu Jigui (jiguizhu_tju@163.com)