Strain sensing based on radiative emission-absorption mechanism using dye-doped polymer optical fiber.

A stress sensor based on a dye-doped polymeric optical fiber is able to detect stress by simple comparison of two luminescence peaks from a pair of energy transfer organic dyes. Coumarin 540A (donor) and Rhodamine 6G (acceptor) were doped in the core and cladding of the fiber, respectively. For various laser wavelengths, the change in the near-field pattern and visible emission spectrum upon variation in the fiber bending diameter was evaluated. From a comparison with a lownumerical-aperture fiber, it is shown that the sensitivity of the sensor is controllable by optimization of the waveguide parameters. [ABSTRACT FROM AUTHOR]