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2.2 ELECTRICAL, ELECTRONIC, INFORMATION ENGINEERING
Analysis and performance evaluation of a macro-bend ¯ber based interrogation system for a Bragg grating sensor array is presented. Due to the characteristic properties of the macro-bend ¯ber ¯lter such as polarization and temperature dependence and the total noise associated with the ratiometric system, a best ¯t ratio slope is required to interrogate multiple FBGs whose peak wavelengths are spread over a wide wavelength range, rather than the optimal slope for individual FBG. In this paper for investigation we have used an FBG array with 5 FBGs with peak re°ected wavelengths lying between 1525 nm and 1575 nm. The analysis of the system is carried out and a ¯ber ¯lter with a slope which covers a wavelength range of 1525-1575 nm is selected which ensures a resolution and accuracy for all the FBG sensors in the array as close as possible to that which would be achieved with a ¯lter with an optimal slope for each FBG. Performance evaluation of the system is carried out and static strain, dynamic strain and temperature is measured with the developed interrogation system.
Rajan, G., Semenova, Y., Farrell, G.:Analysis and Performance Evaluation of an All-Fiber Wide Range Interrogation System for a Bragg Grating Sensor Array.Journal of Optics A:Pure and Applied Optics, Vol.11, 2009