Fig. 5.

The histogram for the gate delay time dependent pathlength distribution $P(t_s,L)$ for the case when (a) the effect of IRF is not taken into account and (b) the effect of IRF is taken into account. (c) $g_2(\tau )$ obtained from the Monte Carlo wave model (solid lines) and analytical predictions (dashed lines) in Eq. (10) for the case when (c) the effect of IRF is not taken into account and (d) the effect of IRF is taken into account. We have calculated results for $t_s=0.5$, 1.5, 2.5 ns, coherence length $l_c=90\mathrm{mm}$, gate width $t_w=0.2\mathrm{ns}$, source–detector separation $\rho =20\mathrm{mm}$. Other parameters are the same as in Fig. 3.