Fast interrogation of dynamic fiber Bragg grating using neighborhood average algorithm.

• A fast query system of FBG based on swept laser is proposed. • A fast and efficient neighborhood averaging algorithm is proposed. • Experimental results show that the proposed algorithm has strong stability and excellent demodulation accuracy and speed. 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 wavelength 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. [ABSTRACT FROM AUTHOR]