Reverse Modulator Based On Giant Magnetostrictive Material Of The Optical Preliminary Study

The typical wireless laser communication system demands both the sides of the communication must install the laser sending set and the laser incepting set. It must be installed the complex scout and collimation equipments which enhance the difficulty of the system consumedly when the both sides are in relative movement. By modulating the echo being sent from the other side, wireless laser communication based on optic retro-modulation system makes the communication. It has many advantages such as excuse the scout and collimation equipment of one side; lighten the weight and volume of the equipment and making the system more flexibility. Compared to the typical wireless laser communication system, the wireless laser communication adopting optic retro-modulation technology doesn't need to exactitude orientation to the sending. Besides, the advantages such as strong direction, quick reflection, simple structure and big field of vision are included in the new system.A new optic retro-modulation technology based on Frustrated Total Internal Reflection (FTIR) and Giant Magnetostrictive Material (GMM) is presented in this dissertation.The main achievements in this dissertation are listed as follows:1. The significance of the optic retro-modulation technology to wireless laser communication and laser friend or foe identification are expatiated .Then, the principles of the optic retro-modulation technology, the advantages, disadvantages and problems existing are analyzed. The types of the optic retro-modulation technology and the characteristic of the technology are discussed in the last.2. The relations of transmission and reflection to incident angle, relation gap width and refraction index are presented in graphs by using the theory of the Frustrated Total Internal Reflection (FTIR). The scheme of the optic retro-modulation technology based on FTIR is presented; the primary structure of the optic retro-modulation apparatus is given.3. The giant magnetostrictive phenomenon and its form mechanism are analyzed in the dissertation and the basic properties of Giant Magnetostrictive Material (GMM) are analyzed .Meanwhile, the system of giant magnetostrictive actuator used for optic retro-modulation technology is designed. At last, the range of working frequency of GMM actuator is given by theoretical analysis and computation.4. According to the Maxwell equation group, finite element analysis software ANSYS is applied to simulate drive magnetic field structure of actuator, which validates the uniformity of magnetic field and confirms the structure of drive magnetic field. At last, the configuration of the optic retro-modulation apparatus is given.5. Some experiments are done to measure the displacement of the actuator. The experimental result indicates that the linearity of displacement works well, and the scheme of the optic retro-modulation technology based on giant magnetostrictive material (GMM) is feasible.