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Real-time displacement measurement using a pattern correlation system incorporating an ultra-high-speed shutter camera and parallel aligned nematic liquid crystal spatial light modulators (PAL-SLMs)

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6 Author(s)
Toyoda, H. ; Central Res. Lab., Hamamatsu Photonics KK, Hamakita, Japan ; Kobayashi, Y. ; Mukohzaka, N. ; Yoshida, N.
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PIV (Particle Image Velocimetry) system has been composed of an ultra-high-speed shutter camera and optical correlator for real-time (frame-rate) operation. The ultra-high-speed shutter camera has several functions such as optical amplification (typically ×104), high speed shuttering (100 nsec-1 msec), and multi-shuttering (1, 2, 4, and 8 times) for forming a double-exposure pattern of an object image, in order to measure the displacement of the flow. The optical correlator is a joint transform correlator (JTC) using two PAL-SLMs, which are optically addressed spatial light modulators with phase only modulating function, for real-time analysis of the double-exposure pattern. It is demonstrated that the system can measure velocity of a random-dot pattern on a side of a rotating disk with frame-rate response. The performance of the system is shown and discussed

Published in:

Instrumentation and Measurement Technology Conference, 1994. IMTC/94. Conference Proceedings. 10th Anniversary. Advanced Technologies in I & M., 1994 IEEE

Date of Conference:

10-12 May 1994

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