Dual-frequency fringe for improving measurement accuracy of three-dimensional shape measurement

• 作者: Zixiao Miao Qican Zhang
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（10）
• 所属期刊栏目: Physical Optics
• 页码范围: 81-87
• 页数: 7页
• 语种: 英文
• DOI: 10.3788/COL202119.102601

摘要

A new phase unwrapping method based on dual-frequency fringe is proposed to improve both high accuracy and large measurement range of three-dimensional shape measurement by synthesizing the projected dual-frequency fringes obtaining higher and lower frequencies.The lower-frequency one is their phase difference,which can help unwrap the wrapped phase of the higher-frequency one from their phase sum.In addition,the relationship between the measuring accuracy and the frequencies of the projected fringes is studied to guide the frequency selection in actual measurement.It is found that the closer the two frequencies are,the higher the measurement accuracy will be.The computer simulation and experiment results show the viability of this method.