Fast interrogation of dynamic fiber Bragg grating using neighborhood average algorithm

A fast interrogation scheme for dynamic fiber Bragg grating (FBG) based on a swept laser is presented. A neighborhood average algorithm, meanwhile, is used to real-time and fast demodulate the Bragg wavelength. In this paper, the resolution of the system using neighborhood average algorithm is tested, and the dynamic interrogation of the system is verified using vibration signals. The proposed algorithm achieves a Bragg wave-length resolution of 0.11 pm when the laser scanning frequency is 40 kHz. The stability of the algorithm is compared with Buneman wavelength estimation algorithm. Compared with other commonly used FBG peak search algorithms, the new algorithm has the characteristics of low computational cost, high sensitivity and stability.

Automated summary

A fast and real-time demodulation scheme for dynamic fiber Bragg grating (FBG) based on a swept laser is proposed in this study. The algorithm utilizes a neighborhood average algorithm to achieve high resolution and stability in Bragg wavelength interrogation. Experimental results show that the proposed algorithm achieves a Bragg wavelength resolution of 0.11 pm at a laser scanning frequency of 40 kHz. Compared with Buneman wavelength estimation algorithm and other commonly used FBG peak search algorithms, the proposed algorithm demonstrates low computational cost, high sensitivity, and stability.