Non-ambiguous Evanescent-wave Fibre Refractive Index and Temperature Sensor

Falco, L.; Spescha, G.; Roth, Patrick J.; Parriaux, Ο.

doi:10.1080/713821915

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…In this method, the resolution depends on the resolution to which the optical power transmission can be measured. Such sensors have been demonstrated in a bent plastic multimode optical fibre with a partially stripped cladding 15 , in cladded multimode tapered fibre tips with mirrored ends based on the radiation of the modes guided by the cladding 16 , in an evanescent wave-based sensor created using a tapered single-mode fibre embedded in a polymer 17 , in the leakage of a side-polished single-mode fibre 18 , in side-polished plastic optical fibres 19,20 , in a microstructured fibre Bragg grating in a single-mode fibre 21 (the wavelength of the optical source had to be tuned to be close to the Bragg wavelength), in the fibre core diameter mismatches when a small section of a singlemode fibre was sandwiched between two lead multimode fibres 2 , in V-shaped unclad multimode fibres with varying angles 22 , in a tapered section of multimode fibre sandwiched between two single-mode fibres having two different FBGs 23 . The ranges of operation and the peak resolution reported for the sensors described above are given in Table 2.…”

Section: Introductionmentioning

confidence: 99%

Refractive index sensor based on etched D-fibres with wavelength adjustable operating point and resolution

Chandani

Jaeger

2008

SPIE Proceedings

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Silica based fibre-optic refractive index sensors are gaining acceptance over conventional refractometers and finding applications in chemical/biological sensing due to many of their desirable properties. Here we present an optical fibrebased refractive index sensor that uses the power transmission through etched D-shaped fibres. The sensor's operating point and resolution can be tailored for a specific application by selecting the correct combination of the operating wavelength and the cladding thickness of the etched fibre. The sensor's power transmission depends on the surrounding refractive index in which the sensor head is immersed. The sensor presented has a maximum resolution on the order of 10 -6 in its "high resolution" region and on the order of 10 -4 in its "low resolution" region. The refractive index at which the maximum resolution occurs in the high resolution region can be shifted by ~0.012 and by ~0.027 in the low resolution region. To date, such high resolutions have been reported over narrow ranges and/or for fibre Bragg grating based sensors, which require optical spectral analysis which typically, is costly.

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