Interest in polymer optical fiber Bragg gratings (POFBGs) arises from the different material properties and sensing modalities brought by polymers relative to silica. Polymer fibers typically offer twice sensitivity temperature of conventional silica increased strain overall. In addition, have higher elastic limits as a result larger range operation for physical constraints. While some are effectively humidity insensitive, others present inherent sensitivity. Their organic also allow variety...

We demonstrate a largely tunable dispersion fiber Bragg grating (FBG) inscribed in microstructured polymer optical (mPOF). The bandwidth of the chirped FBG (CFBG) was achieved from 0.11 to 4.86 nm, which corresponds range 513.6 11.15 ps/nm. Furthermore, thermal sensitivity is used compensate for wavelength shift due applied strain. These results that CFBG POF promising technology future systems.

We present a polymer fibre Bragg grating sensor and its sensitivity to gamma radiation by observing the reflected spectral profile. The is femtosecond inscribed within perfluorinated CYTOP alteration of wavelength corresponds total dose received. Over 41 k Gy, demonstrates - 26.2 p m / Gy resolution 40 Gy. Under active consideration for instrumentation nuclear waste repositories, this study gives better understanding effects upon gratings in fibres.

Opto-acoustic imaging is a growing field of research in recent years, providing functional physiological biomarkers, such as the oxygenation haemoglobin. Piezo electric transducers are industry standard detector for ultrasonics, but their limited bandwidth, susceptibility to electromagnetic interference and inversely proportional sensitivity size all affect performance. Sensors based on polymer optical fibres (POF) immune interference, have lower acoustic impedance reduced Young's Modulus...

Polymer optical fibre (POF) has been receiving increasing attention for sensing applications. The fundamental properties of POF such as PMMA deliver at least an order magnitude in improvements over silica fibres, though practical difficulties create additional complexity. the potential to lower acoustic impedance, a reduced Young's Modulus and higher sensitivity within megahertz region. In contrast, existing piezo-electric transducers have inherent narrow bandwidth proportionality size that...

Polymer optical fibre (POF) is a relatively new and novel technology that presents an innovative approach for ultrasonic endoscopic applications. Currently, piezo electric transducers are the typical detectors of choice, albeit possessing limited bandwidth due to their resonant nature sensitivity decreases proportionally size. Optical fibres provide immunity from electromagnetic interference POF in particular boasts more suitable physical characteristics than silica fibre. The most important...

We demonstrate the Bragg gratings inscription in 850-nm spectral region by using trans-4-stilbenemethanol-doped poly methyl methacrylate step-index optical fiber and a 248-nm krypton fluoride (KrF) excimer laser system. The only takes 0.4 s. A detailed study of grating fabrication process different pulse repetition rates is also reported. In addition, temperature, humidity, strain sensitivities are measured to potentiality these components for sensing applications.

We obtained chirped gratings by performing hot water gradient thermal annealing of uniform poly (methylmethacrylate) (PMMA) microstructured polymer optical fiber Bragg (POFBGs). The proposed method's simplicity is one its main advantages because no special phase mask or additional etching are needed. It not only enables easy control tuning the central wavelength and chirp characteristics, but it also leads to obtain flexible grating response, compared with tapered POFBGs. Therefore, a...

Opto-Acoustic Endoscopy (OAE) requires sensors with a high sensitivity and small physical dimensions in order to facilitate integration into an endoscope of less than 1mm diameter. We present fibre Bragg grating (FBG) Fabry- Perot intrinsic for ultrasound detection. structure profile characterisation setup analyse tune the preparation ultrasonic evaluate suitability different structures parameters sensing. By analysing prepared gratings, we enable optimisation simplification detection regime...

Opto-acoustic imaging (OAI) shows particular promise for in-vivo biomedical diagnostics.Its applications include cardiovascular, gastrointestinal and urogenital systems imaging.Opto-acoustic endoscopy (OAE) allows the of body parts through cavities permitting entry.The critical parameter is physical size device, allowing compatibility with current technology, while governing flexibility distal end endoscope based on needs sensor.Polymer optical fibre (POF) presents a novel approach...

Opto-acoustic imaging (OAI) shows particular promise for in-vivo biomedical diagnostics. Its applications include cardiovascular, gastrointestinal and urogenital systems imaging. endoscopy (OAE) allows the of body parts through cavities permitting entry. The critical parameter is physical size device, allowing compatibility with current technology, while governing flexibility distal end endoscope based on needs sensor. Polymer optical fibre (POF) presents a novel approach endoscopic has been...

Optoacoustic imaging (OAI) is a hybrid biomedical modality based on the generation and detection of ultrasound by illuminating target tissue laser light. Typically, light in visible or near infrared spectrum used as an excitation source. OAI implementation image reconstruction algorithms using spatial distribution optical absorption tissues. In this work, we apply time-domain back-projection (BP) algorithm wavelet filtering for point line detection, respectively. A comparative study between...

Fibre Bragg gratings (FBGs) can be used as strain, temperature and external refractive index sensor in various application domains more particularly harsh environments such nuclear plants, radioactive waste storages or a space environment inside artificial satellites. In this study, we report the wavelength sensitivity radiation response of FBGs written different optical fibres thanks to lasers methods inscription. We show that radiation-induced shift depends only on core doping not type...

In recent years, Polymer optical fibre (POF) has been receiving increasing attention for sensing applications. For applications such as endoscopic ultrasound and photo-acoustics, PMMA polymer fibres deliver ever improving performance more types of are being trialled these The fundamental properties POF, when correctly leveraged, at least an order magnitude in improvements over silica fibres. POF delivers lower acoustic impedance, a reduced Young's Modulus higher sensitivity within the...

Within the context of ensuring stable nuclear fusion, it is important to monitor and control a number parametersincluding magnetic field associated with plasma circulation. Optical fibre sensing techniques have seen surge in promulgation research advances recent years, due their immunity electromagnetic radiation compact dimensions. Prior work has shown that Bragg gratings are one method recovering induced field, main point interest being use as distributed sensors. However, grating...

We demonstrate a chirped microstructured polymer fiber Bragg grating based on taper technology for strain sensing application. The effective bandwidth of the is dependent and remains practically constant irrespective humidity changes. Besides wavelength shift measurement in temperature stable conditions with 9.02 pm/µe sensitivity, faster measurements under fluctuations condition can be done by measuring grating.