Simultaneous strain and temperature measurement using a superstructure fiber Bragg grating

A novel and simple fiber-optic sensor based on a superstructure fiber Bragg grating (SFBG) for simultaneous strain and temperature measurement is prop osed and demonstrated. The transmission spectrum of the sensor possesses se veral narrow-band loss peaks situated on the slope of a broad-band loss pea k. By measuring the transmitted intensity and wavelength at one of the loss peaks, strain and temperature can be determined simultaneously. The accura cy of the sensor in measuring strain and temperature is estimated to be +/- 20 mu epsilon in a range from 0 to 1200 mu epsilon and +/-1.2 degrees C fro m 20 degrees C to 120 degrees C, respectively.