High-speed two-dimensional fringe analysis using frequency demodulation
High-speed two-dimensional fringe analysis using frequency demodulation
复制标题
使用频率解调进行高速二维条纹分析
DOI：
10.1117/12.250766
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Tomoharu Yamada
中科院分区：
文献类型：
--
作者：
Y. Arai;S. Yokozeki;K. Shiraki;Tomoharu Yamada
本文介绍了一种基于频率解调电路的时域高速二维条纹分析技术。在此基础上建立了一维条纹分析系统，并报道了该系统的性能和特点。使用该系统，可以每10毫秒处理一个一维条纹图案。精度优于1/20条纹。本文将一维条纹分析原理扩展到二维。新的电路可以同时处理水平（x-）和垂直（z-）方向。本文提出了这种电路的设计原则，它结合了两个输出——一个用于x方向，另一个用于z方向。然后用模拟和数字处理电路建立了一个新的二维条纹分析系统。在系统中，每个条纹图作为与CCD时钟脉冲同步的模拟信号。利用这种新的条纹分析方法，可以实现二维图像的高速处理。该系统每秒可以处理14张图像。测试了该条纹分析系统的实验室样机的特性。
This paper describes a new high speed 2D fringe analysis technique in the time domain using an electric circuit based on frequency demodulation. A 1D fringe analysis system based on this new technique has already been built, and its performance and characteristics were reported. With that system, a 1D fringe pattern could be processed every 10 msec. The accuracy was better than 1/20 fringe. In this paper, the principle of 1D fringe analysis is expanded to two dimensions. New electric circuits with which to process horizontal (x-) and vertical (z-) directional simultaneously were built. The paper proposes principles for the design of such circuits, which combine two outputs--one for the x- direction and the other for the z-direction. A new 2D fringe analysis system was then built using both analogue and digital processing circuits. Each fringe pattern was treated as an analogue signal synchronized with the CCD clock-pulse in the system. Using this new fringe analysis method, high- speed 2D image-processing can be realized. The system can process fourteen images a second. The characteristics of a laboratory prototype of this fringe analysis system were tested.