Strain sensing based on coherent Rayleigh scatteringin an optical fibre

Posey, R.; Johnson, Gregg A.; Vohra, S. T.

doi:10.1049/el:20001200

Cited by 185 publications

(96 citation statements)

References 7 publications

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“…In the year 2000, Posey et al 19 demonstrated an alternative measurement technique in which the relative phase of the backscattered light between two separate sections in the sensing fibre was measured using an imbalanced Mach-Zehnder interferometer (MZI) (Figure 2(b)). In their technique, the backscattered light from a single pulse is inserted into an imbalanced MZI with two unequal arms to provide two similar traces with temporal shift of ∆T = ∆L · n/c, where ∆L is the path imbalance of the MZI.…”

Section: A Optical Time Domain Reflectometry (Otdr)mentioning

confidence: 99%

Contributed Review: Distributed optical fibre dynamic strain sensing

Masoudi

Newson

2016

Review of Scientific Instruments

214

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Extensive research on Brillouin- and Raman-based distributed optical fibre sensors over the past two decades has resulted in the commercialization of distributed sensors capable of measuring static and quasi-static phenomena such as temperature and strain. Recently, the focus has been shifted towards developing distributed sensors for measurement of dynamic phenomena such as dynamic strain and sound waves. This article reviews the current state of the art distributed optical fibre sensors capable of quantifying dynamic vibrations. The most important aspect of Rayleigh and Brillouin scattering processes which have been used for distributed dynamic measurement are studied. The principle of the sensing techniques used to measure dynamic perturbations are analyzed followed by a case study of the most recent advances in this field. It is shown that the Rayleigh-based sensors have longer sensing range and higher frequency range, but their spatial resolution is limited to 1 m. On the other hand, the Brillouin-based sensors have shown a higher spatial resolution, but relatively lower frequency and sensing ranges.

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Section: A Optical Time Domain Reflectometry (Otdr)mentioning

confidence: 99%

Contributed Review: Distributed optical fibre dynamic strain sensing

Masoudi

Newson

2016

Review of Scientific Instruments

214

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“…One involves embedding strain sensors along the length of the device, as implemented in the robotic cockroach antennae in [15]. Fiber optic sensors have also been developed for measuring strain in flexible objects [10], [19], [20]. However, while strain gages and optical fibers This material is based upon work supported in part by National Science Foundation grant 0651803 and in part by National Institute of Health grant R44 CA134169.…”

Section: Introductionmentioning

confidence: 99%

Visual sensing of continuum robot shape using self-organizing maps

Croom

Rucker

Romano

et al. 2010

2010 IEEE International Conference on Robotics and Automation

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Shape control of continuum robots requires a means of sensing the the curved shape of the robot. Since continuum robots are deformable, they take on shapes that are general curves in space, which are not fully defined by actuator positions. Vision-based shape-estimation provides a promising avenue for shape-sensing. While this is often facilitated by fiducial markers, sometimes fiducials are not feasible due to either the robot's application or its size. To address this, we present a robust and efficient stereo-vision-based, shapesensing algorithm for continuum robots that does not rely on fiducials or assume orthogonal camera placement. The algorithm employs self-organizing maps to triangulate threedimensional backbone curves. Experiments with an object with a known shape demonstrate an average accuracy of 1.53 mm on a 239 mm arc length curve.

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“…Fibre sensors based on fibre Bragg gratings (FBGs), for example, may interrogate length-scales in the millimetre range, while low-coherence Michelson interferometry may interrogate length-scales in the tens of metres range (Elamari et al 1994). Recently, research at the US Naval Research Laboratory has exploited coherent Rayleigh backscatter in optical fibre to develop a sensor with tunable gauge lengths (Posey et al 2000). Finally, the small size, small footprint and material properties of optical fibre allow such sensors to be embedded inside materials such as composites during the fabrication process, leading to more fully realized 'smart structure' concept.…”

Section: Introductionmentioning

confidence: 99%

Bragg grating-based fibre optic sensors in structural health monitoring

Todd

Nichols

Trickey

et al. 2006

Phil. Trans. R. Soc. A.

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This work first considers a review of the dominant current methods for fibre Bragg grating wavelength interrogation. These methods include WDM interferometry, tunable filter (both Fabry-Perot and acousto-optic) demultiplexing, CCD/prism technique and a newer hybrid method utilizing Fabry-Perot and interferometric techniques. Two applications using these techniques are described: hull loads monitoring on an all-composite fast patrol boat and bolt pre-load loss monitoring in a composite beam in conjunction with a state-space modelling data analysis technique.

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Strain sensing based on coherent Rayleigh scatteringin an optical fibre

Cited by 185 publications

References 7 publications

Contributed Review: Distributed optical fibre dynamic strain sensing

Contributed Review: Distributed optical fibre dynamic strain sensing

Visual sensing of continuum robot shape using self-organizing maps

Bragg grating-based fibre optic sensors in structural health monitoring

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