Real-time velocity measurement by the use of a speckle-pattern correlation system that incorporates a ferroelectric liquid-crystal spatial light modulator.
Real-time velocity measurement by the use of a speckle-pattern correlation system that incorporates a ferroelectric liquid-crystal spatial light modulator.
复制标题
使用包含铁电液晶空间光调制器的散斑图案相关系统进行实时速度测量。
DOI：
10.1364/ao.33.002785
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发表时间：
1994
期刊：
影响因子：
1.9
通讯作者：
S. Fukushima
中科院分区：
文献类型：
--
作者：
Y. Kobayashi;T. Takemori;N. Mukohzaka;N. Yoshida;S. Fukushima
本文介绍了一种利用双曝光散斑技术和光学信号处理技术进行非接触速度测量的方法。这两个散斑图案被记录在铁电液晶（FLC）空间光调制器（SLM），这是一个光寻址的SLM，然后分析的复合图案类似于一个联合变换相关器，其中使用另一个FLC-SLM和位置敏感检测器的光学系统。我们表明，系统的性能可以显着提高，通过调整曝光之间的时间，使用一个实时反馈系统，是基于输出平面中的相关斑点的位置。
We describe a technique for noncontact velocity measurement by using double-exposure speckle-pattern techniques with optical signal processing. The two speckle patterns are recorded on a ferroelectric liquid-crystal (FLC) spatial light modulator (SLM), which is a bistable optically addressed SLM, and the composite pattern is then analyzed by an optical system similar to a joint transform correlator, in which another FLC-SLM and a position-sensitive detector are used. We show that the performance of the system can be significantly improved by adjusting the time between exposures using a real-time feedback system that is based on the position of the correlation spot in the output plane.