Distributed Bragg grating sensing with a direct group-delay measurement technique

Duck, Graham; Ohn, Myo Myint

doi:10.1364/ol.25.000090

Cited by 14 publications

(4 citation statements)

References 4 publications

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“…Under the condition of perpendicular incidence, the reflectivity at the fiber end surface is given by Fresnel formula Rϭ(nϪ1) 2 /(nϩ1), 2 where n is the index of the fiber core, and the typical value is 1.46, corresponding to 4% reflectivity. For good butt-connected fiber ends, the air gap is smaller than one wavelength, in that case the typically reflectivity R i (ϭR i Ј) is nearly equal to 1%.…”

Section: Multiplexing Capacitymentioning

confidence: 99%

Recent progress in bidirectional interrogation techniques for enhancing multiplexing capability of fiber optic white light interferometric sensors

2002

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Section: Multiplexing Capacitymentioning

confidence: 99%

Recent progress in bidirectional interrogation techniques for enhancing multiplexing capability of fiber optic white light interferometric sensors

2002

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“…Compared with conventional electrical strain gages, fiber optic strain sensors have many advantages, such as electro-magnetic immunity and resistance to chemical corrosion. Therefore, in the past few years, there has been intense works on the development of fiber optic strain sensors [1][2][3][4]. These most of the developed sensors are very sensitive in measuring strain.…”

Section: Introductionmentioning

confidence: 99%

Analytic Formulation of Transmission Light Intensity of Hole Blockers in Intensity-based Polymer Optical Fiber Sensors

Kwon¹,

Kim²,

Shim³

et al. 2011

Journal of Sensor Science and Technology

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Intensity-based optical fiber sensors are devised using a blocker which is located between two polymer optical fibers(POFs), one fiber is light-in and the other is light-out. This blocker is moved by an external displacement. Therefore, finding a general formulation of the relation between this displacement and transmission light intensity of various blockers is important to help develop intensity-based optical fiber sensors. In this paper, we consider blockers with arbitrary shapes from circular holes to inclined angled blockers. The transmission light intensities of such blockers should be determined by this generalized equation. In order to verify this equation, the calculated intensities of the blockers are compared with the values acquired from experiment. In the comparison, it is shown that the analytic equation can give the exact values of the transmitted light intensities for the assorted blockers. The range of the displacement measurement is also shown to be about 6 times of the radius of the hole in the case of a 9 degree inclined angle blocker.

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“…Thereafter, the distributed vibration fiber optic sensor was also developed by using Mach-Zehnder interferometer [5,6]. The other examples of such sensing systems are fiber Bragg grating sensors [7,8], optical time domain reflectometry (OTDR), and Brillouin optical time domain reflectometry (BOTDR) distributed sensors [9,10]. White light interferometry, as a technique employing low coherence broadband light sources, is also one of attractive and potential candidate for application of perimeter security.…”

Section: Introductionmentioning

confidence: 99%

Loop topology based white light interferometric fiber optic sensor network for application of perimeter security

Yuan

Dong

2010

Photonic Sens

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A loop topology based white light interferometric sensor network for perimeter security has been designed and demonstrated. In the perimeter security sensing system, where fiber sensors are packaged in the suspended cable or buried cable, a bi-directional optical path interrogator is built by using Michelson or Mach-Zehnder interferometer. A practical implementation of this technique is presented by using an amplified spontaneous emission (ASE) light source and standard single mode fiber, which are common in communication industry. The sensor loop topology is completely passive and absolute length measurements can be obtained for each sensing fiber segment so that it can be used to measure quasi-distribution strain perturbation. For the long distance perimeter monitoring, this technique not only extends the multiplexing potential, but also provides a redundancy for the sensing system. One breakdown point is allowed in the sensor loop because the sensing system will still work even if the embedded sensor loop breaks somewhere.

show abstract

Distributed Bragg grating sensing with a direct group-delay measurement technique

Cited by 14 publications

References 4 publications

Recent progress in bidirectional interrogation techniques for enhancing multiplexing capability of fiber optic white light interferometric sensors

Recent progress in bidirectional interrogation techniques for enhancing multiplexing capability of fiber optic white light interferometric sensors

Analytic Formulation of Transmission Light Intensity of Hole Blockers in Intensity-based Polymer Optical Fiber Sensors

Loop topology based white light interferometric fiber optic sensor network for application of perimeter security

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