紫外レーザーを用いたファイバーグレーティングセンサーの作製と特性評価

概要

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Abstract Recently in the field of architecture and civil, there is a great demand high performance sensor for Health Monitoring to guarantee the efficiency of buildings. Optical Fiber sensor development is now being watched with interest because it is not influenced magnetic field. Therefore it takes place of the strain sensors which using bridge connection until now. FBG that can apply as strain sensor was fabricated based on the UV photosensitivity of germanosilicate in the fiber core. The interference fringe was generated exposuring UV light through the phase mask with KrF Excimer Laser, this interference fringe made Brag Gratings in the Optical fiber core. FBG fabrication was performed changing rep-rate from 1OHZ to 600Hz,exposuring fluences from 5 to 20mmJ/cm(2乗). The specification value which demand as strain sensor is that the time of reach 1OdB refractivity is within 300 seconds, the spectrum wave shape of FWHM is within 1OOpm, the fraction strain after exposed UV light is 3.2%. In our observation we could attain that minimum of fabricating time is 6 seconds, exposuring length of a fiber line keeps above 8mm, which could minimize FWHM 38pm,the maximum fracture strain afier exposed UV light is 5.79% to controlling exposuring fluences. High precision Optical Fiber Sensor was fabricated to optimize controlling expusuring fluences and multiplying rep-rate, we think.
宮崎大学の論文