Measurement Accuracy Enhancement via Radio Frequency Filtering in Distributed Brillouin Sensing

Feng, Cheng; Preußler, Stefan; Kadum, Jaffar Emad; Schneider, Thomas

doi:10.3390/s19132878

Cited by 18 publications

(9 citation statements)

References 34 publications

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“…More importantly, a higher SNR might contribute to a more accurate determination of the local BFS at a distinct fiber section, i.e., a higher measurand resolution. The traditional de-noise [ 54 , 55 , 56 , 57 ] and signal amplification [ 58 ] methods, however, cannot effectively improve the SNR of a conventional BOTDA setup. This can be mainly attributed to the consideration of Brillouin gain interaction only.…”

Section: Benefits Of Brillouin Spectral Property Engineering In Stmentioning

confidence: 99%

Benefits of Spectral Property Engineering in Distributed Brillouin Fiber Sensing

Feng

Schneider

2021

Sensors

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As one of the most consolidated distributed fiber sensors based on stimulated Brillouin scattering, the Brillouin optical time-domain analyzer (BOTDA) has been developed for decades. Despite the commercial availability and outstanding progresses which has been achieved, the intrinsic Lorentzian gain spectrum restricts the sensing performance from possible further enhancements and hence limits the field of validity of the technique. In this paper, the novel method of engineering the gain spectral properties of the Brillouin scattering and its application on static and dynamic BOTDA sensors will be reviewed. Such a spectral property engineering has not only provided improvements to BOTDA, but also might open a new way to enhance the performance of all kinds of distributed Brillouin fiber sensors.

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Section: Benefits Of Brillouin Spectral Property Engineering In Stmentioning

confidence: 99%

Benefits of Spectral Property Engineering in Distributed Brillouin Fiber Sensing

Feng

Schneider

2021

Sensors

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“…Long-term stability would require active stabilization. A DC-270 MHz low pass filter at the output of the main photodetector (PD) [33], [34], limits the noise at the input of the digital recording oscilloscope, while being wide enough to preserve the spatial resolution offered by the temporal characteristics of the pump pulse. Triggering of both the pump pulse and trace recording are controlled by the DTG.…”

Section: Experiments a Setupmentioning

confidence: 99%

Gain Spectrum Engineering in Slope-Assisted Dynamic Brillouin Optical Time-Domain Analysis

Feng

Bhatta

Bohbot

et al. 2020

J. Lightwave Technol.

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Slope-Assisted Brillouin Optical Time Domain Analysis (SA-BOTDA) is a fast and distributed sensing technique that interrogates the Brillouin gain spectrum (BGS) near the middle of the linear region of its slope, allowing the measurement of high frequency vibrations. However, environmentally-induced deviations of the interrogation point from the rather small linear region around the optimum frequency position, result in harmonic distortion and changes in the slope value, which determines the gain-to-frequency conversion factor. Engineering the BGS by adding a loss probe, we propose a novel and improved version of SA-BOTDA, having a significantly wider drift tolerance for the interrogation point. Here, using a 14 ns pump pulse and a judicious choice of the frequency of the loss probe, we demonstrate an engineered BGS having a 70% wider frequency range (as compared with the conventional BGS), where the interrogation point can drift without compromising either the prescribed level of harmonic distortion or the given slope tolerance, further benefiting the flexibility and usage of SA-BOTDA.

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“…The first one involves the use of hardware measures and/or digital filters designed to minimize the noise component, with the subsequent finding of a maximum at already processed signal. For example, in [6][7][8], the use of low-pass filtering, modulation of the intensity of the pump wave and the probe wave, and also modulation of the wavelength of the probe signal is considered. The successful application of the wavelet-filtering of BGS was described in [9,10].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

A Novel Method of Spectra Processing for Brillouin Optical Time Domain Reflectometry

Barkov

Konstantinov

Krivosheev

2020

Fibers

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A new method of Brillouin spectra post-processing, which could be applied in modern distributed optical sensors: Brillouin optical time domain analyzers/reflectometers (BOTDA/BOTDR), has been demonstrated. It operates by means of the correlation analysis performed with special technique («backward-correlation»). It does not need any additional data for time or space averaging and operates with the single spectrum only. We have simulated the method accuracy dependence on signal-to-noise ratio (SNR) and other parameters. It is shown that the new method produces better results at low SNRs than conventional technique, based on finding of Brillouin spectrum maximum, do. These results are in a good agreement with the experiment. Finally, we have estimated the performance of the new method for its application in polarization-BOTDA set-up for a polarization maintaining (PM) fiber modal birefringence distributed study.

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Measurement Accuracy Enhancement via Radio Frequency Filtering in Distributed Brillouin Sensing

Cited by 18 publications

References 34 publications

Benefits of Spectral Property Engineering in Distributed Brillouin Fiber Sensing

Benefits of Spectral Property Engineering in Distributed Brillouin Fiber Sensing

Gain Spectrum Engineering in Slope-Assisted Dynamic Brillouin Optical Time-Domain Analysis

A Novel Method of Spectra Processing for Brillouin Optical Time Domain Reflectometry

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