scholarly journals Bio and Chemical Sensing by a Low Cost Plasmonic Platform in Plastic Optical Fibers

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Luigi Zeni
Keyword(s):  
Optical Fibers ◽  
Chemical Sensing ◽  
Low Cost ◽  
Plastic Optical Fibers

Low-Cost Sensing with Plastic Optical Fibers—From Turbidity and Refractive Index to Chemical Sensing

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 12
Author(s):  
Filipa Sequeira ◽  
Daniel Duarte ◽  
Rogério Nogueira ◽  
Lúcia Bilro
Keyword(s):  
Refractive Index ◽  
Quality Assessment ◽  
Optical Fibers ◽  
Chemical Sensing ◽  
Low Cost ◽  
Research Groups ◽  
Water Contaminants ◽  
Sensing Systems ◽  
Site Monitoring ◽  
Plastic Optical Fibers

This manuscript presents low-cost sensing systems for the monitoring of liquids, namely water and beverages quality assessment, with remote and in-site monitoring capabilities. The collaboration with several research groups allowed the development of smart optical platforms and low-cost sensors based on plastic optical fibers for the measurement of turbidity, color, refractive index and water contaminants.

scholarly journals Refractive Index Sensor Based on Twisted Tapered Plastic Optical Fibers

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 40 ◽  
Author(s):  
Teng ◽  
Deng ◽  
Liu ◽  
Yang ◽  
Yuan ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Simple Structure ◽  
External Medium ◽  
Low Cost ◽  
The Other ◽  
Refractive Index Sensor ◽  
Coupling Ratio ◽  
Plastic Optical Fibers ◽  
Drawing Method

We proposed a refractive index (RI) sensor employing two twisted tapered plastic optical fibers (POFs). The tapered POFs were fabricated by a heating and drawing method and were twisted around each other to form a coupled structure. The sensor consisted of two input ports, a twisted region, and two output ports. The tapered POF could make the light couple from one POF to the other easily. The twisted tapered POFs could constitute a self-referencing sensor, and by monitoring the changes of the coupling ratio, the variations of the external medium RIs could be measured. The RI sensing performances for the sensors with different fiber diameters and twisted region lengths were studied. The sensitivities of 1700%/RIU and −3496%/RIU in the RI ranges of 1.37–1.41 and 1.41–1.44 were obtained, respectively. The sensor is a low-cost solution for liquid RI measurement, which has the features of simple structure and easy fabrication.

scholarly journals D-Shaped POF Sensors for Refractive Index Sensing—The Importance of Surface Roughness

Sensors ◽  
2019 ◽  
Vol 19 (11) ◽  
pp. 2476 ◽  
Author(s):  
Filipa Sequeira ◽  
Nunzio Cennamo ◽  
Alisa Rudnitskaya ◽  
Rogério Nogueira ◽  
Luigi Zeni ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Refractive Index ◽  
Optical Fibers ◽  
Low Cost ◽  
Water Quality Assessment ◽  
Refractive Index Sensing ◽  
Plastic Optical Fibers ◽  
Index Changes ◽  
Low Cost Manufacturing ◽  
Scattering Losses

In this study the influence of the surface roughness on the transmission capacities of D-shaped plastic optical fibers (POFs) and sensors performance was investigated. Five D-shaped POF sensors were produced and characterized for refractive index sensing between 1.33 and 1.41. The sensors were characterized using a low-cost optical sensing system based on the variation of the transmitted light though the POF with refractive index changes (RI). Higher surface roughness increases the scattering losses through the POF and influences the sensors’ performance; therefore, a balance must be attained. Generally, the best performance was achieved when the sensing region was polished with P600 sandpaper as a final polishing step. Polishing with sandpapers of lower grit size resulted in lower scattering, higher linearity of the sensor response and generally lower performance for RI sensing. A sensor resolution of 10−3–10−4 RIU, dependent on the value of the external refractive index, was obtained through simple and low-cost manufacturing procedures. The obtained results show the importance of surface roughness in the development of POF sensors which can be used in several applications, such as for water quality assessment.

THICK PHOTORESIST ORIGINAL MASTER: A NEW TOOL FOR FABRICATION OF POLYMERIC OPTICAL WAVEGUIDES WITH LARGE CORE BY HOT EMBOSSING

2004 ◽  
Vol 13 (03n04) ◽  
pp. 513-517 ◽  
Author(s):  
HIROTAKA MIZUNO ◽  
OKIHIRO SUGIHARA ◽  
TOSHIKUNI KAINO ◽  
YUKA OHE ◽  
NAOMICHI OKAMOTO ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Optical Waveguides ◽  
Low Cost ◽  
Hot Embossing ◽  
Large Core ◽  
Plastic Optical Fibers ◽  
Thick Photoresist ◽  
Rectangular Groove ◽  
Flattening Process ◽  
Exposure Process

A simple and low-cost fabrication method of polymeric optical waveguides with large core sizes for plastic optical fibers is presented. The waveguides are fabricated by hot embossing with a rectangular ridge ultraviolet (UV)-cured epoxy resin stamper. The stamper is fabricated by replication of a rectangular groove mold that is made from silicone rubber replicated from a rectangular ridge original master made from thick photoresist (SU-8). A rectangular ridge shape of the original photoresist master of 1 mm size was realized by using a flattening process, which involves hot embossing before the exposure process and using a UV-cut filter during the exposure process.

scholarly journals Swelling-Based Chemical Sensing With Unmodified Optical Fibers

2021 ◽  
Author(s):  
Alin Jderu ◽  
Dorel Dorobantu ◽  
Dominik Ziegler ◽  
Marius Enachescu
Keyword(s):  
Water Quality ◽  
Optical Fibers ◽  
Food Processing ◽  
Chemical Sensing ◽  
Low Cost ◽  
Water Quality Monitoring ◽  
Medical Diagnostics ◽  
Distributed Sensing ◽  
Quality Monitoring ◽  
Strain Sensing

AbstractWe use distributed fiber optic strain sensing to examine swelling of the fiber’s polymer coating. The distributed sensing technique that uses unmodified low-cost telecom fibers opens a new dimension of applications that include leak detection, monitoring of water quality, and waste systems. On a short-range length scale, the technology enables “lab-on-a-fiber” applications for food processing, medicine, and biosensing for instance. The chemical sensing is realized with unmodified low-cost telecom optical fibers, namely, by using swelling in the coating material of the fiber to detect specific chemicals. Although generic and able to work in various areas such as environmental monitoring, food analysis, agriculture or security, the proposed chemical sensors can be targeted for water quality monitoring, or medical diagnostics where they present the most groundbreaking nature. Moreover, the technique is without restrictions applicable to longer range installations.

scholarly journals Swelling-Based Distributed Chemical Sensing with Standard Acrylate Coated Optical Fibers

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 718
Author(s):  
Sina Sedighi ◽  
Marcelo A. Soto ◽  
Alin Jderu ◽  
Dorel Dorobantu ◽  
Marius Enachescu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Chemical Sensing ◽  
Low Cost ◽  
Refractive Index Change ◽  
Water Quality Monitoring ◽  
Medical Diagnostics ◽  
Optical Frequency Domain Reflectometry ◽  
Frequency Domain Reflectometry ◽  
Agriculture Water

Distributed chemical sensing is demonstrated using standard acrylate coated optical fibers. Swelling of the polymer coating induces strain in the fiber’s silica core provoking a local refractive index change which is detectable all along an optical fiber by advanced distributed sensing techniques. Thermal effects can be discriminated from strain using uncoated fiber segments, leading to more accurate strain readings. The concept has been validated by measuring strain responses of various aqueous and organic solvents and different chain length alkanes and blends thereof. Although demonstrated on a short range of two meters using optical frequency-domain reflectometry, the technique can be applied to many kilometer-long fiber installations. Low-cost and insensitive to corrosion and electromagnetic radiation, along with the possibility to interrogate thousands of independent measurement points along a single optical fiber, this novel technique is likely to find applications in environmental monitoring, food analysis, agriculture, water quality monitoring, or medical diagnostics.

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