STRAN GAGES AND FIBER OPTIC SENSORS IN STRUCTURAL HEALTH MONITORING OF COMPOSITE PRESSURE VESSELS

چکیده مقاله

Currently, most composite pressure vessels (COPV) must be recertified every 2-5 years via hydrostatic testing to confirm the structural integrity of the pressure vessel. Strain gages and Fiber Bragg Grating Sensors (FBGS) are gaining increasing attention in the field of experimental stress analysis. They are very well suited to the new materials of glass and carbon fiber reinforced composites which are often used for highly stressed constructions, e.g. in airplanes and wind power plants. Basically, Fiber Optic Bragg Sensors are strain-measuring devices and therefore provide many of the advantages of the well known metal foil strain gages. This paper gives a short introduction to Strain gages and FBG sensors, points out their special strengths and weaknesses and describes a measuring system which enables strain gages and FBGS to be measured simultaneously, providing all data processing functions originally developed for the strain gages also for the FBGS signals, both strain gages and FBGS are used.

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