The eddies at the Egyptian and the Middle East coasts are generated by the instability of the surface circulation (AW: Atlantic Water). For describing these eddies, a lot of satellite images (SST: Sea Surface Temperature) have been treated and analyz
ed at the Levantine sub-basin. This study inferred that there is an approchement in the eddies´ trajectory in both south west and south east of the Levantine sub-basin, where most eddies tend to separate from AW towards off sea. While eddies in the south east of the Levantine develop faster than that in the south west.
This research illustrates the design of a parallel plate reflector operating in the visible and near infrared fields, with a reflection and/or transmission coefficients equal to 50%, and robust to the polarization of the used light and its extinction
ratio (PER), in each of the two directions of polarization (perpendicular S and parallel P). Also there is no need for accurate adjustment of the plate so that the angle of incidence is exactly equal to 45.
The research has its various applications in optical measurements laboratories, laser technology laboratories, optical communication laboratories, and photography.
One of the most important applications of this plate is ophthalmology devices, which can be used as glasses for people with impaired vision, light measurements in laser laboratories and optical measurements.
Summary of the thesis
In this research, the work examined the role that lasers play in unguided systems in underwater wireless systems (FSOUW), which determine the practical choice of laser system components in unguided systems, and examine the impa
ct of the absorption of sea and ocean water to lasers and their association with laser wavelength.
Three wavelengths (445, 532, 650) nm have been used to assess the validity of the selection of the appropriate water channel with 100 ml watts of laser as its transmitter energy. SNR, BER and SER were examined following five different water channels. These are pure tap water, and with salt, various concentrations of Malox (MG(OH)2 and Al (OH)3) and salt have been added in order to get high-turbid water, and the results show that mallox and salt content reduces the energy receiving the laser signal and causes disconnection.
The charts on wavelength change were drawn with their absorption coefficient in the laboratory for several wavelengths and several types of ocean water and the results were discussed.
