Multiplexed optical fibre Fabry-Perot sensors for strain metrology

Singh, Mandeep; Tuck, Christopher; Fernando, Gerard Franklyn

doi:10.1088/0964-1726/8/5/304

Cited by 24 publications

(15 citation statements)

References 14 publications

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“…Air cavities of greater than 20 μm are required to eliminate misalignment of the cavity endfaces; lengths of 30–40 μm were selected to provide both good temperature sensitivity and low coupling loss. The fiber cavity length must be greater than the air cavity length by enough distance to allow sufficient frequency separation of the coupled air cavity, fiber cavity, and air/fiber combination signals, similar to the demodulation of a frequency-based multiplexed sensor, as described elsewhere [ 38 , 39 ]. Cavities in the range of 100–150 μm are sufficient to meet this requirement.…”

Section: Methodsmentioning

confidence: 99%

Photonic Biosensor Assays to Detect and Distinguish Subspecies of Francisella tularensis

Cooper

Bandara

Wang

et al. 2011

Sensors

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The application of photonic biosensor assays to diagnose the category-A select agent Francisella tularensis was investigated. Both interferometric and long period fiber grating sensing structures were successfully demonstrated; both these sensors are capable of detecting the optical changes induced by either immunological binding or DNA hybridization. Detection was made possible by the attachment of DNA probes or immunoglobulins (IgG) directly to the fiber surface via layer-by-layer electrostatic self-assembly. An optical fiber biosensor was tested using a standard transmission mode long period fiber grating of length 15 mm and period 260 μm, and coated with the IgG fraction of antiserum to F. tularensis. The IgG was deposited onto the optical fiber surface in a nanostructured film, and the resulting refractive index change was measured using spectroscopic ellipsometry. The presence of F. tularensis was detected from the decrease of peak wavelength caused by binding of specific antigen. Detection and differentiation of F. tularensis subspecies tularensis (type A strain TI0902) and subspecies holarctica (type B strain LVS) was further accomplished using a single-mode multi-cavity fiber Fabry-Perot interferometric sensor. These sensors were prepared by depositing seven polymer bilayers onto the fiber tip followed by attaching one of two DNA probes: (a) a 101-bp probe from the yhhW gene unique to type-A strains, or (b) a 117-bp probe of the lpnA gene, common to both type-A and type-B strains. The yhhW probe was reactive with the type-A, but not the type-B strain. Probe lpnA was reactive with both type-A and type-B strains. Nanogram quantities of the target DNA could be detected, highlighting the sensitivity of this method for DNA detection without the use of PCR. The DNA probe reacted with 100% homologous target DNA, but did not react with sequences containing 2-bp mismatches, indicating the high specificity of the assay. These assays will fill an important void that exists for rapid, culture-free, and field-compatible diagnosis of F. tularensis.

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Section: Methodsmentioning

confidence: 99%

Photonic Biosensor Assays to Detect and Distinguish Subspecies of Francisella tularensis

Cooper

Bandara

Wang

et al. 2011

Sensors

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“…The advantages of optical fibre-base sensor systems include [ 27 ]: (i) the circular cross-section of optical fibres with diameters in the range 20–200 micrometres. This makes it relatively easy to embed them within the preforms at the time of manufacturing [ 28 ]; (ii) the surface chemistry of optical fibres is receptive to conventional surface treatments such as silane coupling agents [ 29 ]; (iii) they are immune from electromagnetic interference, hence, unlike their electrical counterparts, they can be used in environments with high electrical potentials; (iv) a unique characteristic is the possibility of monitoring multiple parameters on a single optical fibre [ 30 ]; (v) distributed sensing is also a practical reality [ 31 ]; and (vi) a wide range of optical fibre types are available commercially, thus appropriate compositions can be selected to suit specified end-use applications [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Self-Sensing Composites: In-Situ Detection of Fibre Fracture

Malik

Wang

Curtis

et al. 2016

Sensors

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The primary load-bearing component in a composite material is the reinforcing fibres. This paper reports on a technique to study the fracture of individual reinforcing fibres or filaments in real-time. Custom-made small-diameter optical fibres with a diameter of 12 (±2) micrometres were used to detect the fracture of individual filaments during tensile loading of unreinforced bundles and composites. The unimpregnated bundles were end-tabbed and tensile tested to failure. A simple technique based on resin-infusion was developed to manufacture composites with a negligible void content. In both cases, optical fibre connectors were attached to the ends of the small-diameter optical fibre bundles to enable light to be coupled into the bundle via one end whilst the opposite end was photographed using a high-speed camera. The feasibility of detecting the fracture of each of the filaments in the bundle and composite was demonstrated. The in-situ damage detection technique was also applied to E-glass bundles and composites; this will be reported in a subsequent publication.

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“…The feasibility of using an EFPI sensor design for monitoring strain in tandem with temperature logging via fluorescence-decay has also been demonstrated [20]. Singh et al [21] reported the feasibility of multiplexing a number of EFPI sensors where the interrogation was carried out using a conventional Fourier transform infrared spectrometer.…”

Section: Introductionmentioning

confidence: 99%

Process monitoring of fibre reinforced composites using a multi-measurand fibre-optic sensor

Nair

Machavaram

Mahendran

et al. 2015

Sensors and Actuators B: Chemical

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a b s t r a c tThis paper reports on the design, fabrication, characterisation and deployment of a multi-measurand optical fibre sensor (MMS) that is capable of simultaneously monitoring strain, temperature, refractive index and cross-linking chemistry. The sensor design is based on the extrinsic fibre Fabry-Perot interferometer. A feature of this sensor system is that a conventional multi-channel fibre-coupled near-infrared spectrometer is used to monitor the four independent parameters. The issues relating to the measurement resolution of the individual sensors and the associated interrogation equipment are discussed. The MMS was embedded in between the fourth and fifth plies of an eight-ply E-glass plain-weave fabric. A commercially available thermosetting epoxy/amine resin system was used to impregnate the fabric layers manually. The laminated preform was vacuum-bagged and cured in an autoclave. The following parameters were monitored: the depletion rates of the epoxy and amine functional groups in the resin system; the temperature in close proximity to the "chemical sensor"; the evolution of strain; and the refractive index of the resin system. The effect of post-processing on the output from the embedded optical fibre sensors is also considered.

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Multiplexed optical fibre Fabry-Perot sensors for strain metrology

Cited by 24 publications

References 14 publications

Photonic Biosensor Assays to Detect and Distinguish Subspecies of Francisella tularensis

Photonic Biosensor Assays to Detect and Distinguish Subspecies of Francisella tularensis

Self-Sensing Composites: In-Situ Detection of Fibre Fracture

Process monitoring of fibre reinforced composites using a multi-measurand fibre-optic sensor

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