A novel application of range-gated underwater laser imaging system (ULIS) in near-target turbid medium

Chingseong Tan, Gerald Seet, Andrzej Sluzek, Duo Min He

Research output: Journal PublicationArticlepeer-review

91 Citations (Scopus)


Range-gated imaging system improves signal-to-backscattering noise ratio (SBR) by rejecting backscattered light from the target irradiance. This is achieved by synchronizing the arrival of pulsed target irradiance with the gating of an intensified camera. Witherspoon and Holloway (Ocean Optics X 1302 (1990) 414-420) indicated that the image quality of range-gated imaging system might be further improved by a delay in the camera gating towards the tail of reflected image temporal profile (RITP). This phenomena has, however, not been further elaborated. This paper extends on Witherspoon's observation. The MCRITP (Monte Carlo for RITP) algorithm is validated with theoretical and experimental results for medium attenuation coefficients of 0.26-5.90/m. By temporal convolution of the simulated results with outgoing Gaussian light pulse, Tail RITP region shows more reduction in the unwanted backscatter effects than the target intensity. This can be observed as an improvement in image contrast and a modified fidelity index (MF).

Original languageEnglish
Pages (from-to)995-1009
Number of pages15
JournalOptics and Lasers in Engineering
Issue number9
Publication statusPublished - Sept 2005
Externally publishedYes


  • Backscattering
  • Monte Carlo
  • Range-gated
  • Reflected image temporal profile
  • ULIS

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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