A novel multi-point ultraviolet optical fibre sensor based on cladding luminescence

Fitzpatrick, Colin; O’Donoghue, Conor; Lewis, Elfed

doi:10.1088/0957-0233/14/8/337

Cited by 23 publications

(14 citation statements)

References 7 publications

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“…The former are small in size, light, electrically safe and resistant to electromagnetic interference. Moreover, it offers the possibility of distributed measurements along the whole sensor length [29,30].…”

Section: Introductionmentioning

confidence: 99%

Novel constructions of optical fibers doped with rare – earth ions

Dorosz¹

2014

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In the paper the research on rare-earth doped and co-doped optical fibre conducted in the Laboratory of Optical Fiber Technology at the Bialystok University of Technology is presented. Novel active fibre constructions like multicore, helical-core and side detecting ribbon/core optical fibers were developed with a targeted focus into application. First construction i.e. multicore RE doped optical fibers enable supermode generation due to phase -locking of laser radiation achieved in a consequence of exchanging radiation between the cores during the laser action. In the paper a far -field pattern of 19 -core optical fiber-doped with Yb 3+ ions, registered in the MOFPA system, showed centrally located peak of relatively high radiation intensity together with smaller side-lobes. Another new construction presented here is helical-core optical fibers with the helix pitch from several mm and the off-set ranging from 10 µm to 200 µm. The properties of helical-core optical fiber co-doped with Nd 3+ /Yb 3+ were also discussed. In the field of sensor applications novel construction of a sidedetecting luminescent optical fiber for an UV sensor application has been presented. The developed optical fiber with an active core/ribbon, made of phosphate glass doped with 0.5 mol% Tb 3+ ions, was used as a UV sensing element.

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Section: Introductionmentioning

confidence: 99%

Novel constructions of optical fibers doped with rare – earth ions

Dorosz¹

2014

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…Between 1995 and 2005 not much happened in this field with the exception of the works by Prince et al 21 , Egalon 22,23 and Fitzpatrick et al 24 . Prince et al reported on a rather complicated system, made of a sensing and illumination fibers, to monitor chemical species.…”

Section: Introductionmentioning

confidence: 99%

“…Fitzpatrick et al 24 also employed the side illumination approach to address a related problem: that of detecting UV radiation. In this case, the UV rays act as the side illumination "source".…”

Section: Introductionmentioning

confidence: 99%

Multipoint side illuminated absorption based optical fiber sensor for relative humidity

Egalon

2013

SPIE Proceedings

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A side illuminated optical fiber sensor with three sensing points and an absorption-based indicator in the cladding was demonstrated for the first time. This device is easy to manufacture, uses leaky modes as the signal carrier and can measure RH in air, soil, concrete and other environments. So far, only side illuminated fluorescence sensors have been reported. They were thought, erroneously, to have their entire signal generated by evanescent wave coupling when, in fact, leaky modes also play an important role. This, coupled to the prevailing misconception that leaky modes propagate for very short lengths of fiber, prevented the earlier discovery of this absorption-based configuration. A 25 cm long fiber, with a cladding doped with an absorption dye sensitive to Relative Humidity (RH), was used in this demonstration. The fiber was side illuminated by a broadband LED, a fraction of this light was absorbed by the cladding and the remaining light guided to the fiber tip as low loss leaky modes. A total of three sensors, two with three sensing points and one with two, were calibrated using a low cost photometer. The signal was linear, stable, increased with RH and had resolutions between 0.11% and 0.25% in RH. With 5 mm diameter LEDs, devices with at least two sensing points per centimeter of fiber can be easily fabricated resulting in sensors with a very high density of sensing points. Compared to the prevailing axial illumination approach, the side illuminated sensor was found to be far simpler and inexpensive. Keywords:optical fiber sensor; side illuminated optical fiber; side excited optical fiber; side pumped optical fiber; absorption based sensor; relative humidity; multi point sensor; high density of sensing points; evanescent wave coupling; high spatial resolution

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“…Typically, the tip of an optical fiber is coated with a suitable luminescent material, and the emitted radiation is collected by the fiber core and transmitted to the diagnostics. While this method enables detection from the ultraviolet (UV) to the x-ray spectral regions [1][2][3][4], spatially resolved measurements are cumbersome and difficult, especially in hazardous environments. In addition, the detectable spectral range is limited by the properties of the luminescent material, and material degradation (e.g., photo-darkening) can severely limit applications when the irradiation levels are high.…”

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confidence: 99%

Fluorescence-based remote irradiation sensor in liquid-filled hollow-core photonic crystal fiber

Zeltner

Bykov

Xie

et al. 2016

Applied Physics Letters

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We report an irradiation sensor based on a fluorescent "flying particle" that is optically trapped and propelled inside the core of a water-filled hollow-core photonic crystal fiber. When the moving particle passes through an irradiated region, its emitted fluorescence is captured by guided modes of the fiber core and so can be monitored using a filtered photodiode placed at the fiber end. The particle speed and position can be precisely monitored using in-fiber Doppler velocimetry, allowing the irradiation profile to be measured to a spatial resolution of similar to 10 mu m. The spectral response can be readily adjusted by appropriate choice of particle material. Using dye-doped polystyrene particles, we demonstrate detection of green (532 nm) and ultraviolet (340 nm) light. Published by AIP Publishing

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A novel multi-point ultraviolet optical fibre sensor based on cladding luminescence

Cited by 23 publications

References 7 publications

Novel constructions of optical fibers doped with rare – earth ions

Novel constructions of optical fibers doped with rare – earth ions

Multipoint side illuminated absorption based optical fiber sensor for relative humidity

Fluorescence-based remote irradiation sensor in liquid-filled hollow-core photonic crystal fiber

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