Note
Extended range underwater optical imaging techniques can be classified into one of two broad categories; those which use synchronouslyscanned narrow source and receiver paths to restrict both back-scattered and forward-scattered light reaching the receiver (continuouswavelaser line scan); and those which use pulsed sources and time-gating to remove back-scatter noise (pulsed laser line scan andpulse-gated laser line scan). In this paper, we present experimental results comparing both LLS and PG-LLS systems for several source-receiver separationsand standoff distances.