Performance of a spatial filtering detector applied to a speckle displacement sensor

The performance of a spatial filtering detector with a comb-shaped photosensitive area, applied to a speckle displacement sensor, is studied by using correlation analysis of its output signal. The coherence of the output signal, which plays the most important role in the measurement, is examined in conjunction with the displacement and the decorrelation of speckle patterns on the detector, which depend on the optical configuration of the measured system. The desirable condition for matching between the structure of the detector and beam diameter on the object has been considered. The theoretical relations have been verified by experiments.

[1]  Ichirou Yamaguchi.  Advances in the laser speckle strain gauge , 1988 .

[2]  A. E. Ennos,et al.  Displacement Measurement from Double-exposure Laser Photographs , 1972 .

[3]  Ichirou Yamaguchi.  Simplified Laser-Speckle Strain Gauge , 1982 .

[4]  W. Peters,et al.  Digital Imaging Techniques In Experimental Stress Analysis , 1982 .

[5]  S Tsutsumi,et al.  Amplitude-modulated reticle constructed by a liquid crystal cell array. , 1981, Applied optics.

[6]  I. Yamaguchi.  Real-Time Measurement of In-Plane Translation and Tilt by Electronic Speckle Correlation , 1980 .

[7]  T. Asakura,et al.  Displacement measurement of speckles using a 2-D level-crossing technique. , 1983, Applied optics.

[8]  Ichirou Yamaguchi,et al.  Accelerated Laser Speckle Strain Gauge , 1986 .

[9]  J. Ator.  Image-Velocity Sensing with Parallel-Slit Reticles* , 1963 .

[10]  Toshimitsu Asakura,et al.  Principles and development of spatial filtering velocimetry , 1987 .

[11]  Y. Kitagawa,et al.  Image velocity sensing using an optical fiber array. , 1982, Applied optics.

[12]  I Yamaguchi,et al.  Automatic measurement of in-plane translation by speckle correlation using a linear image sensor , 1986 .

[13]  Hans J. Tiziani,et al.  Application of speckling for in-plane vibration analysis , 1971 .

[14]  A Speckle Pattern Velocimeter Using a Periodical Differential Detector : Speckle Patterns , 1975 .

[15]  I. Yamaguchi,et al.  A laser-speckle strain gauge , 1981 .

[16]  J. M. Burch,et al.  Production of Multiple Beam Fringes from Photographic Scatterers , 1968 .