All-optical fiber anemometer based on laser heated fiber Bragg gratings

Gao, Shengqiang; Zhang, A. Ping; Tam, Hwa Yaw; Cho, L H; Lu, Chao

doi:10.1364/oe.19.010124

Cited by 129 publications

(53 citation statements)

References 19 publications

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“…The principles of HWA explained above can be adapted to implement an anemometer based on optical fiber sensing of the induced temperature changes, resulting in both point-sensors [28][29][30][31][32][33] and distributed ones [27,34]. As in conventional HWA, the sensing optical fiber has to be artificially heated up.…”

Section: Fiber Optic Implementation Of a Hot-wire Anemometermentioning

confidence: 99%

Long-range distributed optical fiber hot-wire anemometer based on chirped-pulse ΦOTDR

et al. 2018

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Abstract:We demonstrate a technique allowing to develop a fully distributed optical fiber hot-wire anemometer capable of reaching a wind speed uncertainty of ≈ ±0.15 m/s (±0.54 km/h) at only 60 mW/m of dissipated power in the sensing fiber, and within only four minutes of measurement time. This corresponds to similar uncertainty values than previous papers on distributed optical fiber anemometry but requires two orders of magnitude smaller dissipated power and covers at least one order of magnitude longer distance. This breakthrough is possible thanks to the extreme temperature sensitivity and single-shot performance of chirped-pulse phase-sensitive optical time domain reflectometry (ΦOTDR), together with the availability of metal-coated fibers. To achieve these results, a modulated current is fed through the metal coating of the fiber, causing a modulated temperature variation of the fiber core due to Joule effect. The amplitude of this temperature modulation is strongly dependent on the wind speed at which the fiber is subject. Continuous monitoring of the temperature modulation along the fiber allows to determine the wind speed with singular low power injection requirements. Moreover, this procedure makes the system immune to temperature drifts of the fiber, potentially allowing for a simple field deployment. Being a much less power-hungry scheme, this method also allows for monitoring over much longer distances, in the orders of 10s of km. We expect that this system can have application in dynamic line rating and lateral wind monitoring in railway catenary wires.

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Section: Fiber Optic Implementation Of a Hot-wire Anemometermentioning

confidence: 99%

Long-range distributed optical fiber hot-wire anemometer based on chirped-pulse ΦOTDR

et al. 2018

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“…We demonstrated a new all-optical fiber anemometer based on a two-FBG concatenated structure in which a laser beam is launched into the fiber and heats the FBG internally [12]. Figure 1 shows the schematic diagram of the proposed FBG anemometer in which two FBGs (S-FBG and R-FBG) written in the optically heatable fiber (OHF) are utilized as sensing and reference elements, respectively.…”

Section: All-fiber Bragg Grating Anemometermentioning

confidence: 99%

“…(1) All-fiber Bragg grating anemometer: a miniature optical fiber anemometer is proposed by using two laser-heated FBGs, and the speed of air flow is measured by determining the dynamic thermal equilibrium between the laser heating and air flow cooling through the monitoring of the FBG central wavelengths [12].…”

Section: Introductionmentioning

confidence: 99%

Advances in optical fiber Bragg grating sensor technologies

et al. 2012

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Abstract:The authors review their recent advances in the development of optical fiber Bragg grating (FBG) sensor technologies. After a brief review of the fiber grating sensors, several newly developed FBG sensors are described. With the continuous development of fiber materials, microstructures and post-processing technologies, FBG sensors are still creative after the first demonstration of permanent gratings thirty years ago.

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“…Their major goal has been the optimization of costs, operations, production, quality and time, that have been obtained through different improvement methods, tools and wind monitoring techniques [1][2][3][4][5][6]. These monitoring systems are necessary in different situations: from itinerant activities like sports (e.g., sail and ski) to bridges or urban buildings monitoring.…”

Section: Introductionmentioning

confidence: 99%