Modified polymer optical fiber sensors for crude oil refractive index monitoring

Samavati, Zahra; Samavati, Alireza; Ismail, Ahmad Fauzi; Yahya, Noorhana; Othman, Mohd Hafiz Dzarfan; Rahman, Mukhlis A.

doi:10.1007/s10854-020-03754-4

Cited by 4 publications

(1 citation statement)

References 38 publications

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“…POF of the type discussed, designed with suitable geometries, can form the basis of evanescent-wave-based refractive-index sensors, even without removing the cladding. In general, such fibers can be locally modified to obtain high sensitivity in many different ways which include side polishing [3,4], heat treatment [3,5,6], chemical etching [7], surface chemical modification [8,9], use of insertion imperfections [10,11] and so on. The structural geometries of the POFs used are usually tapered [5], U-shaped [3,6], D-shaped [9,12] and side-hole [13], for example.…”

Section: Introductionmentioning

confidence: 99%

Innovative sensor for refractive index monitoring based on a plastic optical fiber side-polished in a ‘V’-bent structure

Wang¹,

Sun²,

Ning³

et al. 2023

Meas. Sci. Technol.

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An innovative probe design, based on plastic optical fiber which has been designed around a side-polished fiber, bent into a ‘V’ shape, is reported. Such a probe offers an innovative approach to monitoring of the surrounding refractive index of the material under study. The underlying principle is that such a side-polished optical fiber configured in this way can give rise to an enhanced evanescent field. This structure, with the optical fiber slot, was used to fix the side-polished plastic optical fiber. As a result, the plastic optical fiber (POF) probe created this way has been optimized using different intersection angles, circular chamfer radius and different polished depths. The maximum sensitivity achieved with the use of this probe reaches 206.4 dB/Refractive Index Unit over the range of refractive index from 1.33 to 1.40. In the design, the half intersection angle, the circular chamfer radius and the polished depth were set to 30°, 1.12mm and 194.6μm, respectively. Such a probe based on inexpensive plastic optical fiber has significant potential for a variety of low-cost, refractive index sensing applications.

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