Fibre Bragg Gratings

Othonos, Andreas; Kalli, Kyriacos; Pureur, David; Mugnier, A

doi:10.1007/3-540-31770-8_6

Cited by 162 publications

(157 citation statements)

References 111 publications

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“…For a germanosilicate core, 11 = 0.113, 12 = 0.252, and ] = 0.16 [29]. The effective refractive index of the core of FBG employed for this experiment is 1.447 and a grating spacing is 530 nm.…”

Section: Resultsmentioning

confidence: 99%

Azobenzene-Based Gel Coated Fibre Bragg Grating Sensor for Moisture Measurement

Moniruzzaman

Rock

2016

International Journal of Polymer Science

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A fibre Bragg grating sensor is coated with a novel polymer gel in order to investigate its suitability for nondestructive measurement of moisture in materials that can potentially lose their integrity due to moisture ingress. Absorption and desorption of moisture lead to swelling/shrinkage of an azobenzene-based gel, which induces a strain in the Bragg grating resulting in wavelength shifts. The results demonstrated that the amount of wavelength shift is linearly dependent on the amount of water ingress by the gel. The performance of the proposed optical fibre moisture sensor was found to be repeatable with no detectable hysteresis and has the potential to offer a low-cost route for monitoring moisture content.

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Section: Resultsmentioning

confidence: 99%

Azobenzene-Based Gel Coated Fibre Bragg Grating Sensor for Moisture Measurement

Moniruzzaman

Rock

2016

International Journal of Polymer Science

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“…Shape sensing using Fiber Bragg Grating sensors FBG sensors are optical strain gauges. The change in the reflected Bragg wavelength is related to the mechanical strain applied to the fiber [22]. FBG sensors can measure the bending strain of the needle when positioned along the longitudinal axis of the needle.…”

Section: Methodsmentioning

confidence: 99%

Steering an actuated-tip needle in biological tissue: Fusing FBG-sensor data and ultrasound images

Shahriari

Roesthuis

Berg

et al. 2016

2016 IEEE International Conference on Robotics and Automation (ICRA)

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Abstract-Needle insertion procedures are commonly performed in current clinical practice for diagnostic and therapeutic purposes. Although prevailing technology allows accurate localization of lesions, they cannot yet be precisely targeted. Needle steering is a promising technique to overcome this challenge. In this paper, we describe the development of a novel steering system for an actuated-tip flexible needle. Strain measurements from an array of Fiber Bragg Grating (FBG) sensors are used for online reconstruction of the needle shape in 3D-space. FBG-sensor data is then fused with ultrasound images obtained from a clinically-approved Automated Breast Volume Scanner (ABVS) using an unscented Kalman filter. A new ultrasound-based tracking algorithm is developed for the robust tracking of the needle in biological tissue. Two experimental cases are presented to evaluate the proposed steering system. In the first case, the needle shape is reconstructed using the tracked tip position in ultrasound images and FBGsensor measurements, separately. The reconstructed shape is then compared with the actual 3D needle shape obtained from the ABVS. In the second case, two steering experiments are performed to evaluate the overall system by fusing the FBGsensor data and ultrasound images. Average targeting errors are 1.29±0.41 mm and 1.42±0.72 mm in gelatin phantom and biological tissue, respectively.

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“…Resonant modes of the LPG with period L could be found in intersections of the grating characteristic with the line Λ = L. Since the solution is not necessarily unique, an additional criterion is required. Here, the cladding mode that maximizes the coupling coefficient is chosen as resonant [6]. As the coupling coefficient is determined by a scalar product of the electric fields of the interacting modes, modes with parallel field vectors are most likely to be resonant.…”

Section:    (2)mentioning

confidence: 99%

Femtosecond and UV inscribed grating characterization in photonic crystal fibres: optimization for sensing applications

et al. 2012

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Photonic crystal fibres (PCF) and more commonly microstructure fibres, remain interesting and novel fibre types and when suitably designed can prove to be "ideal" for sensing applications, as the different geometrical arrangement of the air holes alters their optical wave-guiding properties, whilst also providing tailored dispersion characteristics. This impacts the performance of grating structures, which offer wavelength encoded sensing information. We undertake a study on different air hole geometries and proceed with characterization of fibre Bragg and long period gratings, FBG and LPG, respectively that have been inscribed (using either a femtosecond or ultraviolet laser system) within different designs of microstructured fibre that are of interest for sensing applications.

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Fibre Bragg Gratings

Cited by 162 publications

References 111 publications

Azobenzene-Based Gel Coated Fibre Bragg Grating Sensor for Moisture Measurement

Azobenzene-Based Gel Coated Fibre Bragg Grating Sensor for Moisture Measurement

Steering an actuated-tip needle in biological tissue: Fusing FBG-sensor data and ultrasound images

Femtosecond and UV inscribed grating characterization in photonic crystal fibres: optimization for sensing applications

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