An underwater optical device for imaging near sea level and air targets

Abstract

The invention discloses a kind of underwater optical device for imaging the targets near the sea surface and aerial targets, which comprises a pressure protection window, a wedge lens, a first lens group, a reflector and a second lens group which are arranged in sequence. The voltage protection window and the wedge mirror are arranged along the O1-O2 optical path, and the light beam becomes the O1-O2 light path after irradiating along O1-O2 light path and being refracted through a wedge mirror. The second lens group is arranged along the O3-O4 optical path, the pressure protection window is arranged on the outermost layer and is contacted with the sea water when working, and the wedge lens, the first lens group, the reflecting mirror and the second lens group are isolated from the seawater. A clear underwater image of targets in the sea and air, especially near sea level, is realized. The detection effect of the target in the direction of the sea surface is improved, and this optical device has compact structure and strong anti-interference ability.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an underwater optical device for imaging near-sea level and air targets. Background technique [0002] Underwater imaging of air close to the sea level or near the edge of the underwater Snell window (Snell cone) has always been a research hotspot. This is because for sea surface observation, its main target, whether it is underwater or on the water surface, is in the area close to the water surface. For example, a 40m-high cruise ship at sea level only occupies a 5° field of view at 460m away, so a few degrees of field of view near the sea surface are more important when detecting sea and air targets underwater. [0003] Imaging near the horizontal angle in the air or near the edge of the underwater Snell window is more difficult than imaging in the vertical direction. The conventional method is to use a wide-angle lens or a fisheye lens to cover the horizontal area for imagin...

AI Technical Summary

Problems solved by technology

[0003] Imaging near the horizontal angle in the air or near the edge of the underwater Snell window is more difficult than imaging in the vertical direction. The conventional method is to use a wide-angle lens or a fisheye lens to cover the horizontal area for imaging, but the edge image compression and distortion are serious, and the focal length of the lens is longer. short, only a few millimeters

In addition, since the Snell cone is activated at 48.6° to the vertical direction, the incident beam produces a prism-like spectral effect, just like the beam passing through a prism with a vertex angle of 48.6°, resulting in serious chromatic aberration, which affects the imaging quality of the optical device

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