| Summary: | A new type of luminescent optical fibre sensor
for structural health monitoring of composite laminates
(CFRP) is proposed. The Nd3+ doped multi-core doubleclad
fibre incorporated in composite structure was used as
a distributed temperature sensor. The change of luminescence
intensity (Nd3+ ions) at the wavelength of 880 nm
(4F3/2 → 4I9/2) and 1060 nm (4F3/2 → 4I11/2) was used for
internal temperature monitoring. The special construction
of optical fibre was used as it assures an efficient pumping
mechanism and, at same time, it increases the measuring
sensitivity. The linear response with relative sensitivity
0.015 K−1 was obtained for temperature range from 30 up
to 75ºC. The manufacturing process of CFRP with embedded
optical fibre sensor is also discussed.
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