Source: http://opticjourn.ru/vipuski/1792-opticheskij-zhurnal-tom-85-12-2018.html
Timestamp: 2019-04-18 19:25:39+00:00

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A side polished graded index multimode fiber based refractive index sensor is proposed for use in biology measurement. The side polished graded index multimode fiber is fabricated using the wheel polishing method, that is a part of the cladding and core of a graded index multimode fiber are removed to develop a leaking ‘window’ called side polished region. The optical power loss through this structure is sensitive to the refractive index of the analyte liquid which covering the leaking ‘window’. A greatly linear correlation between the optical power loss and refractive index has been achieved. Additionally, we also investigated the influence of each structure parameter on the sensitivity and linearity. From simulation and experiments results obtained, the fiber core of 50 m and R of 10 m are considered as the best choice of fiber structure with its sensitivity is 40.92 dB/RIU in the refractive index range of 1.300–1.450. A bio-solution of fetal bovine serum can be easily detected with this structure whose concentration gradient is two percent. It provides a simple and quick method to detect refractive indices in biology measurement from 1.300 to 1.450. .
Keywords: side polished graded index multimode fiber, refractive index sensor, biological measurement, optical power loss.
Предложен датчик на основе градиентного многомодового волокна с полированной боковой поверхностью для измерения показателя преломления в биологических исследованиях. Часть боковой поверхности волокна, включая оболочку и часть сердцевины, механически сполировывалась так, чтобы организовать окно утечки излучения. Потери мощности из волокна при этом чувствительны к величине показателя преломления жидкостей, определяемых при анализе и контактирующих с окном утечки. Обнаружена корреляция высокой степени линейности между потерями и величиной показателя преломления аналита. Исследовано влияние каждого из параметров изготовленной структуры на чувствительность и линейность при проведении измерений. Моделирование и эксперимент показали, что наилучшие результаты демонстрирует волокно с диаметром сердцевины 50 мкм и расстоянием от её оси до площадки утечки 10 мкм, обеспечивая чувствительность 40,92 дБ на единицу изменения показателя преломления в диапазоне 1,300–1,450 мкм. С лёгкостью обнаруживались двухпроцентные изменения показателя преломления в коровьей внутриутробной сыворотке. Обеспечивается простое и быстрое определение показателей преломления в области 1,3–1,45 мкм при проведении биологических исследований. .
Ключевые слова: многомодовое градиентное оптическое волокно, полированная боковая поверхность, уходящие волны, датчик на основе градиентного волокна, биологические измерения.
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