Abstract
In underwater electro-optic detection, image quality can be degraded by the backscattering of light from the illuminated water volume. In practical systems, we tend to simultaneously require a high level of detection distance (DD), field of view (FOV), and depth of field (DOF), but these factors influence each other by the media scattering. To eliminate this restriction, we propose to explore the underwater wide-area layered light field (UWLLF), which classifies the underwater detection area by the DD and distribution characteristics of the light field, to minimize the scattering influence on target detection. Based on the UWLLF, an underwater electro-optic detection system is designed that can achieve the specifications of a 70° FOV and 7.9-fold attenuation length (for the attenuation coefficient 1.43 /m of 532 nm) DD. In addition, with the spatial separation of light energy, the non-detection zone at short ranges is eliminated, yielding an almost full DOF. With these three factors simultaneously improved, the ability of underwater exploration for object detection is enhanced.
Highlights
Light energy sharply attenuates when it propagates through water because of absorption and scattering
Several technologies based on temporal, spatial, and polarization discrimination, such as line laser scanning (LLS), laser range gating (LRG), optical polarization imaging (OPI), streak tube image lidar (STIL), modulation light imaging (MLI), and structured light imaging (SLI), have been developed to reduce the effects of backscattering. The performance of these systems can be evaluated in terms of detection distance (DD), field of view (FOV), depth of field (DOF), power consumption (PC), and portability, volume and weight (PVW)
We propose the underwater wide-area layered light field (UWLLF) for underwater detection in this paper
Summary
Light energy sharply attenuates when it propagates through water because of absorption and scattering. Unlike the underwater sonar imaging system [1], in underwater electro-optic detection (UEOD) [2]–[8], backscattering can be severe, producing intense levels of image noise at short ranges, while the reflected energy that carries the target information at long distances attenuates to a low level [9].
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