Real-time fringe pattern demodulation with a second-order digital phase-locked loop

被引：0
|
作者：
Gdeisat, Munther A. [1 ]
Burton, David R. [1 ]
Lalor, Michael J. [1 ]
机构：
[1] Coherent/Electro Opt. Research Group, School of Engineering, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, United Kingdom
来源：
Applied Optics | 2000年 / 39卷 / 29期
关键词：
Computer systems - Demodulation - Fourier transforms - Image processing;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The use of a second-order digital phase-locked loop (DPLL) to demodulate fringe patterns is presented. The second-order DPLL has better tracking ability and more noise immunity than the first-order loop. Consequently, the second-order DPLL is capable of demodulating a wider range of fringe patterns than the first-order DPLL. A basic analysis of the first- and the second-order loops is given, and a performance comparison between the first- and the second-order DPLL's in analyzing fringe patterns is presented. The implementation of the second-order loop in real time on a commercial parallel image processing system is described. Fringe patterns are grabbed and processed, and the resultant phase maps are displayed concurrently. © 2000 Optical Society of America.
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页码：5326 / 5336
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