Fiber Optic Sensors

Yin, Stuart; Ruffin, Paul

doi:10.1002/9780471740360.ebs0480

Cited by 29 publications

(30 citation statements)

References 11 publications

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“…The total VC the test set-up enhance time was experime starts to fade enhance the r In order to experimentally verify the strain which is applied, the minimum wavelength intensity is tracked. A maximum wavelength shift of 0.760 nm is obtained at t = 12.96 s. Silica fibers have a typical strain sensitivity of 1 pm / μstrain [7] translating the experimental wavelength shift to 0.760 mstrain. Comparing this value to the theoretical strain of 0.954 mstrain indicates the occurrence of partial slippage of the fiber in the fiber clamps as the displacement is not fully transferred into strain on the fiber.…”

Section: Fully Embedded Systemmentioning

confidence: 97%

Low-cost fully integrated fiber Bragg grating interrogation system

et al. 2012

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Fiber Bragg gratings can be used for monitoring different parameters in a wide variety of materials and constructions. The interrogation of fiber Bragg gratings traditionally consists of an expensive and spacious peak tracking or spectrum analyzing unit which needs to be deployed outside the monitored structure. We present a dynamic low-cost interrogation system for fiber Bragg gratings which can be integrated with the fiber itself, limiting the fragile optical in-and outcoupling interfaces and providing a compact, unobtrusive driving and read-out unit. The reported system is based on an embedded Vertical Cavity Surface Emitting Laser (VCSEL) which is tuned dynamically at 1 kHz and an embedded photodiode. Fiber coupling is provided through a dedicated 45° micromirror yielding a 90° in-the-plane coupling and limiting the total thickness of the fiber coupled optoelectronic package to 550 µm. The red-shift of the VCSEL wavelength is providing a full reconstruction of the spectrum with a range of 2.5 nm. A few-mode fiber with fiber Bragg gratings at 850 nm is used to prove the feasibility of this low-cost and ultra-compact interrogation approach.

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Section: Fully Embedded Systemmentioning

confidence: 97%

Low-cost fully integrated fiber Bragg grating interrogation system

et al. 2012

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“…The resulting sensing sheet, an artificial skin can then be attached to or wrapped around an irregularly shaped object. Fiber Bragg gratings in single mode fibers show a similar sensitivity for different external parameters, such as temperature and strain 3 . The peak reflected wavelength Δλ B shifts by an amount in response to strain ε and temperature change ΔT as given by…”

Section: Embedding Traditional Single Mode Silica Fibersmentioning

confidence: 98%

Optical fiber sensors embedded in flexible polymer foils

Hoe

Steenberge²,

Bosman

et al. 2010

Optical Sensing and Detection

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In traditional electrical sensing applications, multiplexing and interconnecting the different sensing elements is a major challenge. Recently, many optical alternatives have been investigated including optical fiber sensors of which the sensing elements consist of fiber Bragg gratings. Different sensing points can be integrated in one optical fiber solving the interconnection problem and avoiding any electromagnetical interference (EMI). Many new sensing applications also require flexible or stretchable sensing foils which can be attached to or wrapped around irregularly shaped objects such as robot fingers and car bumpers or which can even be applied in biomedical applications where a sensor is fixed on a human body. The use of these optical sensors however always implies the use of a light-source, detectors and electronic circuitry to be coupled and integrated with these sensors. The coupling of these fibers with these light sources and detectors is a critical packaging problem and as it is well-known the costs for packaging, especially with optoelectronic components and fiber alignment issues are huge. The end goal of this embedded sensor is to create a flexible optical sensor integrated with (opto)electronic modules and control circuitry. To obtain this flexibility, one can embed the optical sensors and the driving optoelectronics in a stretchable polymer host material. In this article different embedding techniques for optical fiber sensors are described and characterized. Initial tests based on standard manufacturing processes such as molding and laser structuring are reported as well as a more advanced embedding technique based on soft lithography processing.

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“…The light is confined to the core of the waveguide by total reflection inside the structure. Thus, OFs need a high refractive index material in the core (n 0 ) compared to that of the cladding layer (n 1 ) and it is possible to define a critical angle (θ c ) (Bass et al, 1995;Yin, Ruffin & Yu, 2008) as:…”

Section: Fuel Sensors Based On Refractive Index Measurementsmentioning

confidence: 99%