| 摘要 |
An imaging system designed for use in a low visibility, underwater environment includes a short wavelength light source, such as an ultraviolet LED, for illuminating an object and a camera for capturing images of the object. The exterior of the object is applied with a light absorptive coating, such as a phosphorescent coating. In use, some the light emitted by the light source is reflected by particles suspended in the water, such as silt or algae, at the same relatively short wavelength as initially emitted. However, some of the light emitted by the light source is absorbed by the coated object and re-emitted at a relatively long wavelength based on a principle of fluorescence known as Stokes shift. Accordingly, a cutoff filter disposed in front of the camera enhances visibility of the object by filtering out the short wavelength light reflected by particles suspended in the immediate environment. |
