Vol. 28, Issue 1, pp. 31-40 (1998)

Abstract

A quadratic model of a truncated parabolic-wave object is proposed to represent a periodic test object This test object is experimentally constructed using a multi-exposure specklegram which forms a pattern nearly equivalent to the model described. The imaging irradiance distribution is calculated from the convolution product of the object irradiance and the impulse response of the incoherent imaging system. The theoretical results of the imaging irradiance and the corresponding contrast of the imaging systemm are graphically represented. The theoretical curve of the contrast or modulation transfer function (MTF) showed an agreement with the experimental one obtained from the interference patterns of the modulated speckle.