A FIBER OPTIC STRAIN AND IMPACT SENSOR SYSTEM FOR COMPOSITE MATERIALS

Authors
  1. Lu, Z.J.
  2. Blaha, F.A.
Corporate Authors
Canadian Marconi Co, Montreal QUE (CAN) Avionics Div;Chief of Research and Development, Ottawa ONT (CAN) Director Research and Development Air
Abstract
An elliptical core two-mode fiber can be used as an effective fiber sensor, due to the fact that interference between the LP sub 01 and LP sub 11 modes in an elliptical core fiber is sensitive to perturbations in the surrounding environment. A fiber optic sensor system using an elliptical core two-mode fiber has been developed for measuring strain and impact damage in composite materials. Various elliptical core fibers have been embedded in composite materials and the effects of the embedding process on the fibers have been investigated. The strain measurement was calibrated by measuring the beatlength of the two-mode fiber after embedding. Impact damage detection was performed by measuring the acoustic impact waves propagating in the composite material. The sensor system employs a laser diode whose wavelength can be adjusted to correct the offset of each individual sensor. TRUNCATED
Date of publication
01 Jan 1989
Number of Pages
11
DSTKIM No
91-03732
CANDIS No
70922
Format(s):
Hardcopy;Originator's fiche received by DSIS

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