Wake flow bubble detection optical system

Abstract

The invention provides a wake flow bubble detection optical system which comprises a piece light source, a front set lens and rear set lenses. The rear set lenses are connected with a switching mechanism. The piece light source and the front set lens are placed in a same light path, the number of the rear set lens is multiple, and the rear set lenses are switched through the switching mechanism to enable one set of rear set lens and the front set lens to be correspondingly placed in the same light path. The wake flow bubble detection optical system can achieve subsection shooting of 10-500 micrometers, and small bubbles in wake flow larger than or equal to 10 micrometers can be shot clearly.

Description

technical field [0001] The invention relates to a high-speed microscopic imaging system, in particular to a high-speed microscopic imaging system used in harsh underwater environments. Background technique [0002] Wake turbulence refers to a bubble curtain belt with special physical properties formed in a certain water area after the ship is sailing due to cavitation caused by the rotation of the propeller, broken sea waves, and a large amount of air involved in the waterline. The acquisition of parameters such as the size, velocity, and number density distribution of bubbles in the wake is the basis for studying the physical characteristics of the wake, and it also provides a new technical approach for further research on wake optical guidance. [0003] Wake bubble imaging still has great difficulties, mainly because: (1) The size of each bubble in the wake bubble curtain has a large dynamic range (μm-mm level). , CCD resolution requirements are high; (2) The speed of bub...

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Problems solved by technology

[0003] There are still great difficulties in imaging wake bubbles, mainly because: (1) The size of each bubble in the wake bubble curtain has a large dynamic range (μm-mm level). To image bubbles in a complete range, the telescopic ability of the optical system , CCD resolution requirements are high; (2) The speed of bubble deformation, cracking and displacement is fast, and the movement law and attenuation of each bubble are quite different; (3) The optical system has a depth of field, and the illumination light also has a thickness. Curtain imaging will cause image stacking of bubbles at different object distances; (4) seawater has a strong effect on light absorption and scattering, coupled with the interference of stray light in the ocean, the contrast of the captured pictures is not high; (5) non-bubble suspended matter in seawater Interference of impurities

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