Optical bend sensor based on a long-period fiber grating monitored by an optical time-domain reflectometer -: art. no. 110502

We report an alternative technique to interrogate a long-period fiber grating (LPG) when the grating sensitivity is based on the peak amplitude changes of the resonant wavelength. To read the amplitude changes, a conventional optical domain reflectometer was used. Bend measurements were performed to apply such method and to determine the grating sensitivity for this physical parameter. Reflective measurements, temperature insensitive, and the possibility of multiplexing LPG sensors are some advantages offered by this technique. (c) 2005 Society of Photo-Optical Instrumentation Engineers.