High Spatial Resolution BOTDA Based on Deconvolution and All Phase Digital Filtering

Brillouin optical time-domain analysis (BOTDA) technology plays an important role in distributed monitoring fields. However, the signal-to-noise ratio (SNR) is often degraded in the process of improving the sensing spatial resolution. Therefore, we propose a high spatial resolution BOTDA demodulatio...

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Vydáno v:IEEE sensors journal Ročník 24; číslo 7; s. 10024 - 10030
Hlavní autoři: Peng, Jiaxin, Wang, Tao, Zhang, Qian, Ge, Xiaopeng, Zhu, Yaqi, Zhang, Yongqi, Zhang, Jianzhong, Li, Jian, Zhang, Mingjiang
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.04.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Algorithms
All phase DFT digital filter
Brillouin optical time-domain analysis
Deconvolution
deconvolution algorithm
Demodulation
Digital filters
Finite impulse response filters
Fourier transforms
Noise reduction
Optical fiber sensors
Pulse duration
Signal monitoring
Signal to noise ratio
signal-to-noise ratio (SNR)
Spatial resolution
Time domain analysis
Upgrading
ISSN:1530-437X, 1558-1748
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Popis
Shrnutí:Brillouin optical time-domain analysis (BOTDA) technology plays an important role in distributed monitoring fields. However, the signal-to-noise ratio (SNR) is often degraded in the process of improving the sensing spatial resolution. Therefore, we propose a high spatial resolution BOTDA demodulation scheme based on a deconvolution algorithm complemented by all phase discrete Fourier transform (APDFT) digital filter. Initially, deconvolution algorithm is employed to improve the spatial resolution of the system. Subsequently, APDFT is used to filter out the noise in the signal, thereby improving the SNR while maintaining high spatial resolution. The results show that the sensing spatial resolution is optimized to 43 cm under a 40 ns pulsewidth in a 5.1 km sensing fiber and an enhancement in SNR by 6.5 dB is achieved compared to without denoising. The proposed scheme has a capability to achieve a heightened spatial resolution without upgrading the hardware devices of the BOTDA system.
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ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2024.3359257