Determination of target depth in a turbid medium with polarization-dependent transmitted signals

Chia-Wei Sun, Kuei Chao Liu, Yih Ming Wang, Hsiang Hsu Wang, Yean Woei Kiang, Hua Kuang Liu, C. C. Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We demonstrate a novel method for target depth determination in a turbid medium with experiments and Monte Carlo simulations. This method relies on the strong; dependence of transmitted co-polarized intensity on target depth. Such a dependence originates from the inclusion of certain diffuse photons in the copolarized intensity. A target of stronger scattering located closer to the transmitter results in stronger photon divergence and hence weaker co-polarized intensity at the receiver of a finite aperture. On the other hand, the degree of polarization (DOP) carries only information about ballistic and snake photons. It is weakly dependent on the target depth. The DOP data can be used as a reference of absolute scattering strength in the turbid system. Our experimental and Monte Carlo simulation results show the feasibility of the proposed target depth determination method. Meanwhile, it is shown that an appropriate time-gating process could help in improving the accuracy of target depth. In addition, the results show that the proposed method has quite large applicable ranges of scattering coefficient and absorption coefficient.

Original languageEnglish
Pages (from-to)2106-2112
Number of pages7
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number11
StatePublished - 1 Jan 2003

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