HYBRID FIBER BRAGG GRATING LONG PERIOD FIBER GRATING SENSOR FOR STRAIN/TEMPERATURE DISCRIMINATION/

We demonstrate a novel sensor which uses the difference in strain and temperature response of fiber Bragg gratings and a long period fiber g rating to discriminate between strain and temperature induced waveleng th shifts. Sensor interrogation is performed entirely on the fiber Bra gg grating reflection signals, Strain and temperature were simultaneou sly measured to +/-9 mu strain and +/-1.5 degrees C over a wide range of conditions.