The Development And Measurement Of Ship Wake Optical Specialty

There is few direct reference on ship wakes duo to military secrets. The characteristics of ship wakes have been studied from the Second Word War in other countries where the main research is focused on the acoustic and geometrical specialty, along with the formation and dissolution of bubbles in wakes. The action of bubbles in wake acoustics is another subject investigated. In this present paper different properties of ship wakes are discussed and summarized. The acoustic theory of bubble film in wakes is described in detail in order to compare with wake optical properties conveniently. In addition, light transmission through water and influence of bubbles on scattering of light in the ocean and etc are mentioned in greater detail too. All as mentioned above is focused on providing an intact reference for possible readers to a certain degree, and comparing the light specialty through pure water and sea water and bubble film conveniently. By the comparison, the research growth and development will be accelerated. To accomplish the study items systematically, high-speed photographic technology is used in researching the bubble film. Kinematics and dynamics of bubbles or bubble film are estimated, distribution of bubble in water is roughly cognized. The optical specialty of ship wakes is investigated in two steps: firstly, investigation, on the bubble film produced by bubble worker, is taken with the scheme designed by ourselves in laboratory; secondly, investigation on the real wakes in situ is made with the under water system made. Based on the experiment of first step, physical model for light scattered by film 7 of bubbles is established and related calculation is made. Comparison with the results of experiment gives that the model is applicable and has definite error discussed in the paper. The main research work and the creative ideas in this thesis are as follows: (1) he development and measurement of ship wake optical specialty?is the first-time task in the country. (2)During studying lots of references is obtained and fixed, different specialties are discussed for the first time. The acoustics of bubble film and kinematics and dynamics of bubbles are made out systematically. (3)Physical model for light scattered by film of bubbles is established and related calculation is made based on the first step laboratory investigation, and the rationality is supported by comparing with experiments. (4)Schemes for lab and detecting real wakes underwater, used in practice and approved to be reliable, are designed and manufactured by ourselves.