Novel Speckle Lengthmeter Using The Double Clipping Cross-Correlation Method

T. Yoshida; H. Kitajima; N. Nakatsuka; T. Yamashita

doi:10.1117/12.967397

1 January 1987 Novel Speckle Lengthmeter Using The Double Clipping Cross-Correlation Method

T. Yoshida, H. Kitajima, N. Nakatsuka, T. Yamashita

Proceedings Volume 0813, Optics and the Information Age; (1987) https://doi.org/10.1117/12.967397
Event: 14th Congress of the International Commission for Optics, 1987, Quebec, Canada

Abstract

Various methods for velocity measurements have been proposed'', as applications of dynamic speckles to metrology. Up to now we have developed a speckle velocimeter using the zero-crossing counting method. This method is used to measuring the average velocity of particles suspended in a flowing fluid2'3'. However, with this method, absolute velocity cannot in principle be measured because the zero-crossing numbers depend upon the speckle intensity. On the other hand, with the cross-correlation method, absolute velocity can be measured. In addition, high-speed cross-correlation is achieved by using double clipped speckle signals, which determine the peak position of the correlation function4'. The technique of signal clipping has been applied to many fields5'. In this paper we present a new instrument, which measures the length and the velocity of continuously moving objects, with features such as a compact and flexible optical fiber probe coupled with a laser diode, and the real-time signal processing using a double clipping cross-correlation method operated by tracking frequency.

Citation Download Citation

T. Yoshida, H. Kitajima, N. Nakatsuka, and T. Yamashita "Novel Speckle Lengthmeter Using The Double Clipping Cross-Correlation Method", Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); https://doi.org/10.1117/12.967397

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