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3D-FBG
Development and testing of 3D-FBG-strain sensors for structural health monitoring of rivets and other critical joints in carbon fiber reinforced plastics
In many fields like the structural health monitoring of carbon fiber reinforced plastics, 3D-fiber Bragg sensors have become a ‘sine qua non’. These sensors are considered to be reliable and space-saving strain sensors. At critical local reading points, such as around a rivet, it occasionally may be necessary to resolve the occurring strain into spatial directions i.e. in order to make predictions about the mechanical damage and the residual lifetime of the surrounding laminate and the rivet itself. Up to now three-dimensional detecting fiber Bragg gratings only were fabricated in specially manufactured asymmetrical fibers. In this project the feasibility of these 3D-FBG-sensors manufactured in commercially available standard-fibers shall be demonstrated. The fibers will be grinded in the area of the sensor in order to achieve an asymmetrical shape of the fiber only in the area, where the sensor is inscribed. Until now, the most common way of data interpretation is done using space-consuming spectrometers, which are inapplicable in the case of structural health monitoring of many aircraft parts at a time. Therefore in the frame of the project a micro-optical analysis-unit will be developed as a function-adapted solution which will consume only very few space and also have very little weight.
Funded by
State of Bremen
Timeframe
2009/02/01 - 2011/12/31
Department Manager
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