A Fiber Bragg Grating-Based Anemometer

Huang, Chuan-Ying; Chan, Pei-Wen; Chang, Hsing Cheng; Liu, Wen‐Fung

doi:10.3390/s18072213

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…The basic working principle [35,36] of the FBG (Figure 2) is that when a light beam of wide spectrum enters the FBG, part of the spectrum produces an effective reflection under Bragg conditions. The peak wavelength of the reflected spectrum is called the Bragg wavelength λB, which satisfies the following equation:λB=2neffΛ, where neff is the effective refractive index of the fiber core and Λ is the grating period (nm).…”

Section: Fbg Sensormentioning

confidence: 99%

Testing Mechanical Properties of Rock Bolt under Different Supports Using Fiber Bragg Grating Technology

Guo

Wang

et al. 2019

Sensors

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Fiber Bragg grating (FBG) sensors, which can accurately measure strain, can be integrated with rock bolts with small fingerprints. In this paper, according to the force mechanism of prestressed anchor and non-prestressed anchor, different loading modes were designed, named active loading mode and passive loading mode. Then, FBG technology was used to monitor the axial force variation of prestressed anchor and non-prestressed anchor in different loading modes. Based on the test results, it is found that when the anchoring force is relatively small (<35 kN), prestressed anchors need to be tested by active loading mode, and non-prestressed anchors need to be tested by passive loading mode. For the prestressed anchor, the force condition of the bolt-shaft was similar to that of the two-force bar, and the axial force of the bolt-shaft was nearly the same along its entire length. Taking the applied load as the reference, the change rate of the axial force of the bolt-shaft was less than 10%. For non-prestressed anchor, due to the plate, there is a certain area surrounding the plate where the axial force of the bolt-shaft was greatly influenced. With applied loads of less than 15 kN, the change rate of the axial force on FBG1 was greater than 10%. With applied loads of greater than 20 kN, this was less than 10%. In this area, influenced by the plate, the axial force of the bolt-shaft increases, and as the applied load of the pullout test increases, the influence decreases.

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Section: Fbg Sensormentioning

confidence: 99%

Testing Mechanical Properties of Rock Bolt under Different Supports Using Fiber Bragg Grating Technology

Guo

Wang

et al. 2019

Sensors

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“…Anemometreler rüzgâr hızını ölçmek için, farklı prensiplere göre mekanik [9], sıcak tel [10], ultrasonik [11], LIDAR (Light Detection and Ranging) [12] veya fiber optik [13] olarak üretilebilirler. Bu anemometrelerin yanı sıra, hava akışını algılamak üzere pitot tüpü ile ölçüm çalışmaları yapılmaktadır [14].…”

Section: Introductionunclassified

Lazer tabanlı sensörler kullanılarak rüzgar hızı ve yönü ölçüm cihazı geliştirilmesi

IŞIKLI,

KÖSE,

SAGBAS

2023

NÖHÜ Müh. Bilim. Derg.

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Farklı türlerde anemometreler ve yön belirleme cihazları, rüzgar hızı ve yönünün ölçülmesinde kullanılmaktadır. Ancak, rüzgar enerjisinden üretilen elektrik üretimi ve tahmini için uygun maliyetli ve hassas ölçüm cihazlarına ihtiyaç vardır. Bu nedenle, lazer mesafe sensörleri, mikrodenetleyiciler ve entegre elektronik devreler kullanılarak uygun maliyetli bir anemometre tasarlanmıştır. Bu tasarım, ölçüm merkezinden sapan mesafeyi hesaplayarak rüzgar hızı ve yönü verileri sağlamaktadır. Bu yöntem, diğer tekniklerden farklı olarak oluşturulmuştur ve elde edilen veriler gerçek bir anemometre ile karşılaştırılmıştır. Hata analizi sonucunda, bağıl hata değeri 0.01685 olarak bulunmuştur. Bu yöntem, düşük maliyetli ve hassas bir rüzgar hızı ve yönü ölçümü sağlamak için etkili bir çözümdür.

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“…Although they offer excellent performance, they are complex to manufacture, require calibration depending on the fluid, are prone to clogging, and are incompatible with harsh environments such as high temperature, corrosive fluids, or strong electromagnetic fields. Optical fiber-based flow sensors to date operate using optical fiber interferometry [7,8] or optical hot-wire anemometry [9,10]. Hot-wire anemometers estimate flow rates by measuring the heat losses from a heating element with a fiber temperature sensor, such as fiber Bragg gratings [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Optical fiber-based flow sensors to date operate using optical fiber interferometry [7,8] or optical hot-wire anemometry [9,10]. Hot-wire anemometers estimate flow rates by measuring the heat losses from a heating element with a fiber temperature sensor, such as fiber Bragg gratings [9,10]. Unfortunately, the major drawback of anemometers is their inability to detect flow direction.…”

Section: Introductionmentioning

confidence: 99%

Liquid Flow Meter by Fiber-Optic Sensing of Heat Propagation

Jderu

Soto

Enăchescu

et al. 2021

Sensors

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Monitoring fluid flow rates is imperative for a variety of industries including biomedical engineering, chemical engineering, the food industry, and the oil and gas industries. We propose a flow meter that, unlike turbine or pressure-based sensors, is not flow intrusive, requires zero maintenance, has low risk of clogging, and is compatible with harsh conditions. Using optical fiber sensing, we monitor the temperature distribution along a fluid conduit. Pulsed heat injection locally elevates the fluid’s temperature, and from the propagation velocity of the heat downstream, the fluid’s velocity is determined. The method is experimentally validated for water and ethanol using optical frequency-domain reflectometry (OFDR) with millimetric spatial resolution over a 1.2 m-long conduit. Results demonstrate that such sensing yields accurate data with a linear response. By changing the optical fiber interrogation to time-domain distributed sensing approaches, the proposed technique can be scaled to cover sensing ranges of several tens of kilometers. On the other extreme, miniaturization for instance by using integrated optical waveguides could potentially bring this flow monitoring technique to microfluidic systems or open future avenues for novel “lab-in-a-fiber” technologies with biomedical applications.

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A Fiber Bragg Grating-Based Anemometer

Cited by 10 publications

References 16 publications

Testing Mechanical Properties of Rock Bolt under Different Supports Using Fiber Bragg Grating Technology

Testing Mechanical Properties of Rock Bolt under Different Supports Using Fiber Bragg Grating Technology

Lazer tabanlı sensörler kullanılarak rüzgar hızı ve yönü ölçüm cihazı geliştirilmesi

Liquid Flow Meter by Fiber-Optic Sensing of Heat Propagation

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