Electrical Engineering, Department of

 

Date of this Version

2012

Citation

IEEE SENSORS JOURNAL, VOL. 12, NO. 7, JULY 2012; doi: 10.1109/JSEN.2012.2189383

Comments

Copyright 2012 IEEE

Abstract

Using numerical simulations, we investigated the responses of the π-phase-shifted fiber Bragg gratings (πFBGs) impinged by pressure ultrasonic waves. The effect of the grating length, grating refractive index modification depth, and ultrasonic frequency on the wavelength sensitivity and intensity sensitivity of the πFBG ultrasonic sensor for ultrasonic waves of different wavelengths was analyzed. The directivity of a πFBG sensor was also studied. Our analysis revealed several unique πFBG response characteristics and will be useful in the design and optimization of fiber-optic ultrasonic sensors that use a πFBG as the sensing element.