偏心光纤检测液体折射率.ppt

When the liquid refractive index change,the effective refractive index of partial core optical fiber changes will happen，make the interference peak wavelength drift.Therefore，This principle can be used to measure the refractive index of liquid。 Propagation Characteristics Analysis of Eccentric Core Fiber English Science Writing Zhao Junxue Wang Ying Li Xiaosong Introduction One of the optic fiber as the basis of various optical devices. At present has been widely used in sensor technology, laser technology and high-speed optical communication system. However, the traditional optical fiber sensor also exist insufficient structure is relatively complex, high cost. This subject main research is a kind of sensitive to the change of new type fiber - eccentric core fiber. Optical fiber Optical fiber, consisting of core, cladding and coating. As shown in figure 1. Effect of the transmission of optical signals in the optical fiber is determined by the structure parameters of the fiber. figure 1 Eccentric core fiber Eccentric fiber, it is a kind of profiled fiber. The fiber core set in the center of the deviation and close to the cladding outside eccentric position. Due to the fiber core near appearance, part of the light field will overflow the spread of cladding. The eccentric optical fiber includes two kinds, the dislocation welding the formation of a eccentric core structure when the eccentric core optical fiber and make the fiber core set structure of eccentric core optical fiber in the center of the deviation. Eccentric core fiber In this paper, the research for the common types of eccentric core optical fiber. Its structure and cross section diagram as shown in figure 2. figure 2 Eccentric core fiber Eccentric core optical fiber is still rely on the mechanism of total reflection light transmission, but because of its structure is not symmetrical, so eccentric fiber compared with standard optical fiber, the optical field distribution will