By Leibniz Gottfried Wilhelm
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Extra info for A Unitary Principle of Optics, Catoptrics, and Dioptrics
25 Optical Fiber Sensing Solutions this technique, a distributed fiber-optic sensor was developed to detect the occurrence of leak incidents. Experimentally, longitudinal position of a disturbance can be determined with an average error of 59 m over a total length of 25 km . 6 FIBER GRATINGS Originated from the discovery of photosensitivity of germanium-doped silica, FBG sensing technology has attracted widespread attention and has been the subject of continuous and rapid development since FBGs were used for the first time for sensing purposes in 1989.
High strain/temperature resolution and good spatial resolution, but limited length; temperature compensation required Advantageous for temperature sensing only, since no particular packaging needed to make sensing fiber strain free. Advantage of relatively stronger signal but synchronization of two laser sources at the opposite ends of the fiber is required. 1 Fiber Bend Sensors Effects associated with bending in multimode and single-mode fibers (SMFs) found their application in two early types of intensity-modulated point sensors: microbend and macrobend fiber-optic sensors.
Prefixes micro and macro in this context refer to the scale of the fiber bends rather than to the scale of the volume within which the parameter of interest is measured. While there are certain similarities between the micro- and macrobending in fibers, there are also significant differences between both concepts. Microbending occurs in a multimode fiber and is the mechanical perturbation that causes a redistribution of light power among the many modes in the fiber. The more severe the mechanical perturbation or bending, the more light is coupled to radiation modes and is lost, so that the light intensity decreases with mechanical bending .