Study on statistical characteristics of rough surfaces scattering in double transmission

WU Ying-li; WU Zhen-sen

doi:10.3969/j.issn.1001-3806.2011.02.025

In order to study the effect of laser speckle on target detection,according to the extended Huygens-Fresnel principle,statistical properties of the speckle scattered from the rough surfaces in the far field were analyzed in double transmission.Analytical expressions for the correlation function and covariance of the speckle intensity were derived under the illumination of focused beam and coUimated beam.The results indicate that under the illumination of focused beam,the speckle intensity correlation function of the receiver surface is decreased fast with the laser beam waist and transmission distance decreasing.However,under the illumination of collimated beam,the speckle intensity correlation function of the receiver surface is decreased fast with the laser beam waist and transmission distance increasing.In the whole,it decreased fast under the coUimated illumination than focused illumination.The change rule of intensity covariance is identical with the speckle intensity correlation function.

Study on statistical characteristics of rough surfaces scattering in double transmission

1. School of Science, Xidian University, Xi'an 710071, China

Received Date: 2010-05-06

Accepted Date: 2010-06-10

Available Online: 2011-03-25

Abstract: In order to study the effect of laser speckle on target detection,according to the extended Huygens-Fresnel principle,statistical properties of the speckle scattered from the rough surfaces in the far field were analyzed in double transmission.Analytical expressions for the correlation function and covariance of the speckle intensity were derived under the illumination of focused beam and coUimated beam.The results indicate that under the illumination of focused beam,the speckle intensity correlation function of the receiver surface is decreased fast with the laser beam waist and transmission distance decreasing.However,under the illumination of collimated beam,the speckle intensity correlation function of the receiver surface is decreased fast with the laser beam waist and transmission distance increasing.In the whole,it decreased fast under the coUimated illumination than focused illumination.The change rule of intensity covariance is identical with the speckle intensity correlation function.

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Reference (9)

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Study on statistical characteristics of rough surfaces scattering in double transmission

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References

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