Study On Technique Of Measurement Of Seawater Transparency

The seawater transparency is an important parameter to describe the optical properties of the ocean,which restricts the safety of submarines,the safety of submarine communication and the accuracy of underwater guided weapons.According to the measurement principles and the measurement methods,the seawater transparency is divided into oceanographic seawater transparency and photometric seawater transparency.First of all,this paper does some research on the measurement of transparency of oceanographic water.Preliminary measurement tests are carried out using the prototype of hyperspectral seawater transparency profiler developed by the research group.The spectral information of water is collected in the field.Then the information data is analyzed by using Non-uniform Water Contrast Transfer Equation and compared with the data measured by the transparency disk.The ability of the prototype to measure seawater transparency is preliminarily verified through this way.But in the course of the experiment,it is found that the instruments for measuring the transparency of oceanographic water can’t get rid of the bondage of sunlight,thus it has limitations in use and does not reflect the inherent characteristics of water bodies.In order to objectively reflect the transparency of the water itself,and facilitate the use of this characteristic underwater by the artificial photoelectric seeker.The measurement of the photometric transparency are further studied,this paper presents an underwater measurement scheme for seawater transparency based on micro-nano-array.This measurement scheme focuses on the use of nanomaterials to design a photoelectric collector,a micro-nano-array,which can be split and collected in visible light bands.The introduction of metasurface makes the Bragg reflection waveguide own the ability to beam light in all visible light band,with high resolution and without scanning time.The PbS colloidal quantum dots can achieve efficient collection of visible light.Finally,the MATLAB and COMSOL software simulation experiments are used to verify the spectral and photoelectric conversion.The software simulation provides parameter data for hardware implementation and paves the way for the preparation of the whole instrument.