High-spatial-resolution fiber-optic distributed acoustic sensor based on Φ-OFDR with enhanced crosstalk suppression

He, Li; Liu, Qingwen; Chen, Dian; Deng, Yuanpeng; He, Zuyuan

doi:10.1364/ol.380442

Cited by 34 publications

(11 citation statements)

References 22 publications

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“…The sensor presented a standard deviation of ~0.1 rad (corresponding to ~100 nε ) after fading suppression. This result implies a performance closer to the one demonstrated here but with a much higher detection bandwidth 44 . The two experimental demonstrations developed in this work showed spatial resolutions <4 cm, acoustic samplings up to 40 Hz and a range up to 1 km.…”

Section: Discussionsupporting

confidence: 81%

“…axis 1 GHz (external modulation) Pulse-coding ΦOTDR 18 2.5 cm ~0.1 rad (~0.4 με @ 2.5 cm) 500 m 122 kHz ~4 GHz 2 PD per pol. axis 4 GHz (external modulation) OFDR 42 20 cm ~0.4 rad (200 με @ 20 cm) 30 m 50 Hz ~MHz Multiple detection stages ~5 THz (tuneable laser source) a OFDR 43 10 cm ~1 rad (~1 με @ 10 cm) 200 m 300 Hz ~5 MHz Multiple detection stages ~2.5 THz (tuneable laser source) a OFDR 44 12 cm ~0.1 rad (~100 με @ 10 cm) 950 m 6.25 kHz ~1 GHz 1 PD per pol. axis 8 GHz (external modulation) TE-ΦOTDR (proposed in this work) 2 cm 0.09 rad (~490 με @ 2 cm) 200 m 20 Hz <1 MHz 1 PD per pol.…”

Section: Discussionmentioning

confidence: 99%

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Time-expanded phase-sensitive optical time-domain reflectometry

et al. 2021

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Phase-sensitive optical time-domain reflectometry (ΦOTDR) is a well-established technique that provides spatio-temporal measurements of an environmental variable in real time. This unique capability is being leveraged in an ever-increasing number of applications, from energy transportation or civil security to seismology. To date, a wide number of different approaches have been implemented, providing a plethora of options in terms of performance (resolution, acquisition bandwidth, sensitivity or range). However, to achieve high spatial resolutions, detection bandwidths in the GHz range are typically required, substantially increasing the system cost and complexity. Here, we present a novel ΦOTDR approach that allows a customized time expansion of the received optical traces. Hence, the presented technique reaches cm-scale spatial resolutions over 1 km while requiring a remarkably low detection bandwidth in the MHz regime. This approach relies on the use of dual-comb spectrometry to interrogate the fibre and sample the backscattered light. Random phase-spectral coding is applied to the employed combs to maximize the signal-to-noise ratio of the sensing scheme. A comparison of the proposed method with alternative approaches aimed at similar operation features is provided, along with a thorough analysis of the new trade-offs. Our results demonstrate a radically novel high-resolution ΦOTDR scheme, which could promote new applications in metrology, borehole monitoring or aerospace.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Time-expanded phase-sensitive optical time-domain reflectometry

et al. 2021

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“…In the high-resolution mode (mm), the attainable sensitivity is reduced (see Table 1 ). Other solutions with cm spatial resolution offer better sensitivity at the expense of reducing the number of sensing points and acoustic sampling [ 30 ] or increasing notably the photodetector bandwidth [ 31 ].…”

Section: Discussionmentioning

confidence: 99%

Monitoring of a Highly Flexible Aircraft Model Wing Using Time-Expanded Phase-Sensitive OTDR

Soriano-Amat

Fragas-Sánchez

Martins

et al. 2021

Sensors

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In recent years, the use of highly flexible wings in aerial vehicles (e.g., aircraft or drones) has been attracting increasing interest, as they are lightweight, which can improve fuel-efficiency and distinct flight performances. Continuous wing monitoring can provide valuable information to prevent fatal failures and optimize aircraft control. In this paper, we demonstrate the capabilities of a distributed optical fiber sensor based on time-expanded phase-sensitive optical time-domain reflectometry (TE-ΦOTDR) technology for structural health monitoring of highly flexible wings, including static (i.e., bend and torsion), and dynamic (e.g., vibration) structural deformation. This distributed sensing technology provides a remarkable spatial resolution of 2 cm, with detection and processing bandwidths well under the MHz, arising as a novel, highly efficient monitoring methodology for this kind of structure. Conventional optical fibers were embedded in two highly flexible specimens that represented an aircraft wing, and different bending and twisting movements were detected and quantified with high sensitivity and minimal intrusiveness.

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“…The spatial resolution is inversely proportional to the frequency sweep range, which can reach the sub-millimeter scale [17]. Recent developments of OFDR for DAS have focused on increasing the sweep repetition rate [18], decreasing the computational complexity [16] [19], and suppressing crosstalk among sensors [20]. A bandwidth of more than a kilohertz was achieved using several different OFDR methods [18,20].…”

Section: Introductionmentioning

confidence: 99%

Distributed Acoustic Sensing Based on Coherent Microwave Photonics Interferometry

Hua

Zhu

Cheng

et al. 2021

Preprint

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A microwave-photonics method has been developed for measuring distributed acoustic signals. This method uses microwave-modulated low coherence light as a probe to interrogate distributed in-fiber interferometers, which are used to measure acoustic-induced strain. By sweeping the microwave frequency at a constant rate, the acoustic signals are encoded into the complex microwave spectrum. The microwave spectrum is transformed into the joint time-frequency domain and further processed to obtain the distributed acoustic signals. The method is first evaluated using an intrinsic Fabry Perot interferometer (IFPI). Acoustic signals of frequency up to 15.6 kHz were detected. The method was further demonstrated using an array of in-fiber weak reflectors and an external Michelson interferometer. Two piezo-ceramic cylinders (PCCs) driven at frequencies of 1700 Hz and 3430 Hz were used as acoustic sources. The experiment results show that the sensing system can locate multiple acoustic sources. The system resolves 20 nε when the spatial resolution is 5 cm. The recovered acoustic signals match the excitation signals in frequency, amplitude, and phase, indicating an excellent potential for distributed acoustic sensing (DAS).

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High-spatial-resolution fiber-optic distributed acoustic sensor based on Φ-OFDR with enhanced crosstalk suppression

Cited by 34 publications

References 22 publications

Time-expanded phase-sensitive optical time-domain reflectometry

Time-expanded phase-sensitive optical time-domain reflectometry

Monitoring of a Highly Flexible Aircraft Model Wing Using Time-Expanded Phase-Sensitive OTDR

Distributed Acoustic Sensing Based on Coherent Microwave Photonics Interferometry

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