Laser Position Detection in Ship Wake
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摘要: 舰船尾流场中的大量微气泡会使通过它的激光产生比普通海水强烈得多的散射效应,尾流场中微气泡的前向散射占主导地位,且在一定入射波长下,相对散射光强与气泡半径呈线性关系,气泡半径越大,对激光的散射越明显,这样照射到接收器上的光斑位置就会发生偏移,通过对接收器上光斑中心位置的计算,可以达到探测尾流场的目的。试验结果表明,当激光束穿过模拟尾流区域时,光斑中心距源点距离将发生明显变化,其方差将增大几倍到几十倍,通过检测激光束位置的偏移量为尾流的探测提供了一种途径。Abstract: Large number of microbubbles in ship wake field scatter laser beam passing through them more intensively than sea water, where forward scattering takes dominant position. The forward scattering intensity shows linear relation with microbubble radius at certain incident laser wavelength. The experiment results indicate that when laser penetrates the simulated wake area, the position of spot on charge coupled device(CCD) will change, and the variance of spot position will be enlarged obviously. Therefore, a laser wake homing torpedo can make use of the difference between scattering intensities in both ship wake microbubbles and surrounding sea water to detect ship wake.
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Key words:
- laser /
- ship wake /
- position detection /
- scatter effect
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