In this paper we apply digital in-line holography to image opaque objectsthrough a thick plano-concave pipe. Opaque fibers and opaque particles areconsidered}. Analytical expression of the intensity distribution in the CCDsensor plane is derived using generalized Fresnel transform. \textbf{Theproposed model has the ability to deal with various pipe shape and thicknessand compensates for the lack of versatility of classical DIH models. Hologramsobtained with a 12 mm thick plano-concave pipe are then reconstructed usingfractional Fourier transform (FRFT).} This method allows us to get rid ofastigmatism. Numerical and experimental results are presented.
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