2016-08-242016-08-242006-11-21http://hdl.handle.net/10919/72540A optical fiber sensor for measuring temperature and/or pressure employs temporally created long period gratings. The gratings may be produced by a periodic change in the refractive index of the fiber along the fiber longitudinal axis caused by periodically spaced compressive and/or expansive forces or by spaced-apart unbalanced forces that cause periodic fiber micro-bending. Pressure and temperature are determined by measuring changes in both the wavelength at which light is coupled from a mode guided by a core to a different mode and an amount of such coupling. The gratings are created intrinsically and extrinsically. Single and multiple core fibers are used.application/pdfen-USPatenthttp://pimg-fpiw.uspto.gov/fdd/21/386/071/0.pdf10431456250/227.14250/227.18385/28385/37G01L1/246G01D5/35345G01D5/35377G02B6/020717138621