Social development led to a rapid increase in demand for electricity, many fields of advanced technology is widely used in the grid makes the grid with the development trend of intelligent. With a wide range of power transmission systems, high pressure and high-capacity, the research and application of digital network technology, communication technology and real-time
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Wireless Sensor Network (WSN) is an integration of techniques including sensor, embedded computation, networking, wireless communication and distributed computation. The small sensor nodes can collaborate to test, sense, collect and process the information of monitored objects and transfer the processed information to user via multi-hop wireless communication. WSN is regarded as a way to realize
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Fiber Bragg gratings(FBG) are one type of developing fast passive fiber devices in recent years. FBG sensors have the characteristics of compact structure, easy to integrate and bury. Also they are modulated by wavelength and immune to electromagnetic interference and light intensity fluctuation. Multi-sensing like stress and temperature sensing are achieved by wavelength, time and
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Optic fiber sensor is used in many areas because of its wonderful capability, such as in the health monitoring of structures, electricity industry, medicine, chemicao engineering etc. Fiber Bragg Grating (FBG), one kind of the fiber optical sensors, is often needed owe to its wavelength-decoded characteristic and multiplexing ability. Fiber Fabry Perot (F-P) sensor is
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Modern optical fiber gratings are not only applied in various filters of optical communication network, but also possess potential application prospects and business values in high power lasers and high temperature optical fiber sensors. But optical fiber gratings fabricated through traditional ultra-violet laser technology are hard to satisfy these needs due to inherent deficiency. The
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Nowadays, optical fiber sensor is one of the most popular research hotspot in sensing. For large-scale projects monitoring, comprehensive compared with all of intelligent sensors, as can be seen, optical fiber sensor is the best choice in monitoring conditions of civil projects. In a variety of fiber optic sensors, Fiber Bragg Grating (FBG) sensor has
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This dissertation describes the progression in theory, experiment and related works about the fiber Bragg grating (FBG) and its application in sensing field, which I have carried out during the past three years. Here are the main points:1.The coupled-mode equations of fiber Bragg gratings are derived using Maxwell’s equations, the principle of superposition, and considering
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The thesis focuses on the study on interrogation of fiber Bragg grating (FBG)sensors with a broadband source. FBG sensors are a kind of wavelength-encodedoptical sensor; they have all the advantages normally attributed to optical sensors,such as light weight, small size, high sensitivity, etc. In addition, the FBG sensors areinsensitive to the power fluctuation of the
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Since emerged in the late of 1970′s, as an optical filter, fiber Bragg grating (FBG) has been widely applied to optical fiber communications. Also it has been applied to optical fiber sensors and optical measurements because it is sensitive to strain and temperature. In this dissertation, fiber Bragg gratings which act as quasi-distributed sensors and
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Fiber Bragg grating (FBG) was first discovered by K.O.Hill in 1978. Originally, researchers thought that it was only a new phenomenon and since then suitable manufacturing techniques and application areas had not been found before several techniques emerged, which enabled the huge production and broad applications of various FBGs. The first is the side-writing technique
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