Design Of Underwater Low Light Imaging System

Underwater low light imaging technology has a great prospect in underwater monitoring, archaeological studing,underwater anti-terrorism and underwater entertainment. Researching and exploiting in this field has an important value both in theoretical study and practical use.The paper mainly discussed the design of underwater low light imaging lens and its relative theory:discussed the speciality of the underwater optical issues and the water effects to the imaging system; made a comparison of several patterns of the underwater low light imaging objectives and designed an underwater used photograph objective, meanwhile analyzed its image quality,tolerance analysis as well as its quality verify. All the researches are important issues which we must consider when playing a roll in underwater activity. The paper would offer the base theory to improve the capability of the system and could cut off the time cost in designing and manufacturing a product. This paper mainly include the following content:1) Discussed the influence on the imaging underwater by the water’s optics character, got the conclusion that we must design a specically used underwater photograph objective by comparing several patterns of the underwater imaging system;2) Designed a specically used underwater photograph objective, suggested that there must be an additional lens forward the objective, where the two connected to be a correcting lens system, then analyze the torlerance of the objective and the correct system separately to assure the quality image to improve the reliability of underwater imaging system.3) In case of using range-gated laser illumination technology, the paper has analized the energy of the laser illumination system, simply introduced the range-gated technology, discussed the gate opening time and the imaging distance formula as well.