Fig. 1. Experimental setup for in-line PCMT: (a) schematic diagram of optical path in the BL13W1 of the SSRF; (b) photograph of experimental setup in the BL13W1 of the SSRF; (c) components of CF/PG composite sample.

Fig. 2. Quality optimization for (a)–(c) slices reconstructed from in-line projections at sample-to-detector distances of 10, 40, and 100 mm, (d) profiles of the lines marked in (a)–(c), (e)–(g) slices reconstructed from phase-retrieved projections at sample-to-detector distances of 10, 40, and 100 mm, and (h) profiles of the lines marked in (e)–(g).

Fig. 3. Images and plots for the statistical analyses of fibers in the CF/PG composite, with (a) and (b) displaying the spatial distribution and histogram for the polar angle θ of each fiber, (c) and (d) exhibiting the spatial distribution and histogram of the azimuthal angle φ of each fiber, and (e) and (f) showing the spatial distribution and histogram of the tortuosity value of each fiber.

Fig. 4. Volumetric and positional analyses of pores in the CF/PG composite showing (a) spatial distribution of connected and isolated pores, (b) histogram of the equivalent radius of isolated pores, (c) histogram of the equivalent radius of connected pores, and (d)–(f) spatial distributions of connected pores and the azimuthal angle of their neighboring fibers.