23 May 2014 Multistatic optical imaging system
Author Affiliations +
Conventional underwater laser imaging systems are configured such that the laser illuminator and the optical receiver co-exist on the same platform. The main challenge for optical imaging in turbid water is the collection of light that is scattered multiple times on its path to and from the scene of interest. Sophisticated techniques using pulsed or modulated lasers and gated, high speed photo receivers have been developed to reject scattered light and enhance image quality. Although advancements in laser and receiver hardware have made it possible to reduce the size, weight and power of these laser imaging systems, it is still a significant challenge to make these systems compatible with small, autonomous platforms that are desirable for undersea surveillance. Researchers at NAVAIR have developed a multistatic laser imaging approach where the transmitter(s) and receiver(s) are located on separate, smaller platforms. Each laser illuminator is temporally encoded with information that is used by the receiver(s) to construct an image. Recently, this multistatic configuration was modified so that both 2D (amplitude) and 3D (amplitude and range) underwater imagery was collected. This new system design enables the system to identify low contrast objects that contain distinct range relief features. Results from recent laboratory water tank experiments will be presented to evaluate the performance of this new 3D, multistatic laser imaging system in different water environments.
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Derek Alley, Derek Alley, Brandon Cochenour, Brandon Cochenour, Alan Laux, Alan Laux, Linda Mullen, Linda Mullen, "Multistatic optical imaging system", Proc. SPIE 9111, Ocean Sensing and Monitoring VI, 91110L (23 May 2014); doi: 10.1117/12.2051711; https://doi.org/10.1117/12.2051711

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