Abstract
Fiber optic sensors are expected to be a nerve of composite structures achieving"smart composite structures"which are able to detect their own damage or the changes of their environment. This paper presents some basic properties concerning the bend loss of looped optical fibers with a view to implementing their practical use as fiber optic sensors. Two single mode and one multi mode optical fibers have been investigated by using two light sources of respective wavelengths 633 and 826 nm. The main conclusions are : (1) The bend losses strongly depend on the wavelength of the light source and the type of optical fiber, (2) There is an optimal bend radius corresponding to a maximal sensitivity, (3) Single mode optical fibers can be used as multi points sensor but multi mode fibers cannot, (4) The Marcuse's theoretical formula can simulate experimental results effectively though it is sensitive to input parameters.
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