A novel ultrafast interrogation method of FBG sensors

Jindong Wang; Tao Zhu

doi:10.1117/12.2604753

13 December 2021 A novel ultrafast interrogation method of FBG sensors

Jindong Wang, Tao Zhu

Proceedings Volume 12075, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications; 120750B (2021) https://doi.org/10.1117/12.2604753
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

Fiber Bragg Gating (FBG) is widely used in the distributed and in-situ measurements of strain and temperature such as structural health monitoring and vibration detection. However, the low interrogation speed of FBG limits its application of many conditions. In this work, a novel ultrafast FBG interrogation method is proposed using a micro-resonator based broadband Kerr frequency comb (soliton microcomb, SMC) of which 3 or 5 independent optical modes are employed to interrogate a FBG sensor. The proposed method has the efficiency tens of times over conventional methods and even can be implemented using only analog circuit because only a few simple calculations is included in the deriving process. To assess the feasibility and performance of the proposed method, related influencing factors and several parameters were detailed analyzed, and it was also compared with the conventional methods under different signal to noise rates (SNR). We demonstrated continuous heating experiment (with mean square error 0.624 pm) and high-frequency vibration measurement experiment (10 kHz) with an ultrafast FBG interrogator prototype featuring ultrafast rates up to 300 MHz based on a ~50 GHz-repetition-rate SMC. All the analysis, simulation and experiments reveal the splendid advantages of simple construction, compact and ultra-efficient of the proposed ultrafast interrogating method that highlights the prospects of this method with future in various application fields such as uhf vibration measurement.

Citation Download Citation

Jindong Wang and Tao Zhu "A novel ultrafast interrogation method of FBG sensors", Proc. SPIE 12075, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications, 120750B (13 December 2021); https://doi.org/10.1117/12.2604753

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KEYWORDS

Fiber Bragg gratings

Sensors

Ultrafast phenomena

Vibrometry

Detection and tracking algorithms

Signal to noise ratio

Ultrafast measurement systems

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