论文信息 - The Autocorrelation Function of the Speckle Intensity Fluctuation Integrated Spatially by a Detecting Aperture of Finite Size

The Autocorrelation Function of the Speckle Intensity Fluctuation Integrated Spatially by a Detecting Aperture of Finite Size

The autocorrelation function of the spatially integrated speckle intensity fluctuation is investigated theoretically and experimentally by using both the circular hard aperture and the circular gaussian soft aperture for detection. This investigation shows that the use of the circular gaussian soft aperture simplifies an evaluation of the autocorrelation function of the spatially integrated speckle intensity fluctuation and that the resultant autocorrelation functions obtained using the circular gaussian soft aperture sufficiently approximate to the ones obtained using the circular hard aperture which is usually employed in real situations. The autocorrelation function of the speckle intensity fluctuation integrated spatially by an elliptic detecting aperture is also studied theoretically and experimentally as an extension of the circular hard and gaussian soft detecting apertures.

[1] Toshimitsu Asakura,et al. Dynamic laser speckles and their application to velocity measurements of the diffuse object , 1981 .

[2] T. Iwai,et al. Laser Speckle Velocimeter Using A Zero-Crossing Technique For Spatially Integrated Intensity Fluctuation , 1981 .

[3] E Jakeman,et al. The effect of wavefront curvature on the coherence properties of laser light scattered by target centres in uniform motion , 1975 .

[4] T. Iwai,et al. Simultaneous Magnitude and Direction Measurements of a Diffuse Object's Velocity Using the Rotating Directional Detecting Aperture in a Laser Speckle Zero-crossing Method , 1981 .

[5] Toshimitsu Asakura,et al. Velocity measurement of a diffuse object by using time-varying speckles , 1976 .

[6] R. Barakat,et al. Second-order statistics of speckle patterns observed through finite-size scanning apertures , 1978 .

[7] Toshimitsu Asakura,et al. Real-time velocity measurement for a diffuse object using zero-crossings of laser speckle , 1980 .