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High-Spatial-Resolution High-Accuracy OFDR Distributed Sensors Based on Seamless fs-WFBG Array

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Pubblicato in:Photonics vol. 12, no. 4 (2025), p. 352
Autore principale: Jin Zhengze
Altri autori: Huang Wenzhu, Zhao Yuanjing, Zhang, Wentao
Pubblicazione:
MDPI AG
Soggetti:
Optical noise
Accuracy
Bragg gratings
Fourier transforms
Lasers
Spatial resolution
Optical frequency
Distributed sensor systems
Algorithms
Spatial discrimination
Light
Inscriptions
Demodulation
Laser arrays
Business metrics
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Abstract:In optical frequency domain reflectometry (OFDR), the random optical noise in Rayleigh backscattering and the sliding window length in the algorithm cause a trade-off between sensing spatial resolution and accuracy. This paper proposes a novel high-spatial-resolution high-accuracy OFDR distributed sensor based on a seamless femtosecond weak fiber Bragg grating (WFBG) array. Using femtosecond laser point-by-point (PbP) inscription technology, a 5 cm long seamless weak grating array was successfully fabricated on a polyimide fiber, consisting of ten 5 mm long WFBGs. The experimental results demonstrate that a sensing spatial resolution of 533 μm and a wavelength demodulation accuracy of ±2.05 pm were achieved for the first time.
ISSN:2304-6732
DOI:10.3390/photonics12040352
Fonte:Advanced Technologies & Aerospace Database