The increasing use of thermoplastic carbon fiber-reinforced plastic (CFRP) materials in the aerospace industry for
primary aircraft structures, such as wing leading-edge surfaces and fuselage sections, has led to rapid growth in the field
of structural health monitoring (SHM). Impact, vibration, and load can all cause failure, such as delamination and matrix
cracking, in composite materials. Moreover, the internal material damage can occur without being visible to the human
eye, making inspection of and clear insight into structural integrity difficult using currently available evaluation methods.
Here, we describe the detection of impact and its localization in materials and structures by high-speed interrogation of
multiple-fiber Bragg grating (FBG) sensors mounted on a composite aircraft component.
Deminsys is the world's fastest multi sensor / multi channel FBG interrogator, identifies one till four channels with
typically 8 sensors per channel. The system is especially developed for the interrogation of signals up to 19,3 kHz for
each sensor and the sample frequency is independent of the number of sensors. By having multiple sensors per fibre you
can create a very compact network of sensors. Due to its revolutionary (light weight, compact and solid state) design,
Deminsys seems to fit perfectly into (research) programs for aerospace, medic & life science, maritime, industrial, crash
test and all other fast detection applications.
Technobis Fibre Technologies (TFT) and NLR made a first test flight with the Deminsys optical fibre measurement
system using the NLR test aircraft on October 24th 2008. This flight was a first step in the further development of the
current system in order to make it suitable for operation on-board an aircraft and bring it from TRL3 towards TRL5, a
functional model for aerospace applications.