Low-cost Robust Polymer Optical Fiber Temperature Sensor Based on FIR Method for in Situ Measurement

This research discusses the polymer optical fiber sensor for respiratory measurements. The infrared LED that produces light will propagate along the polymer optical fiber which will be received by the phototransistor and the differential amplifier. The output voltage in the form of an analog signal will be converted to a digital signal by the Arduino Uno microcontroller and displayed on the computer. The polymer optical fiber sensor is installed on the corset using a variety of configuration (straight, sinusoidal, and spiral), placed in the abdomen, and a variety of positions (abdomen, chest, and back) using only a spiral configuration. While doing the inspiration, the stomach will be enlarged so that the optical fiber sensor will have strain. The strain will cause loss of power, the resulting light intensities received by the phototransistor are reduced, and the output voltage on the computer decreases. The result shows that the highest voltage amplitudes were in the spiral configuration placed in the abdominal position for slow respiration measurements with the highest range, sensitivity, and resolution which are 0.119 V, 0.238 V/s, and 0.004 s, respectively. The advantages of our work are emphasized on measurement system simplicity, low cost, easy fabrication, and handy operation and can be connected with the Arduino Uno microcontroller and computer.

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Vortex Polymer Optical Fiber with 64 Stable OAM States

Polymers ◽

10.3390/polym12122776 ◽

2020 ◽

Vol 12 (12) ◽

pp. 2776

Author(s):

José A. Borda-Hernández ◽

Claudia M. Serpa-Imbett ◽

Hugo E. Hernandez Figueroa

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Communication Systems ◽

Low Cost ◽

Higher Order ◽

Coupling Coefficients ◽

Polymer Optical Fiber ◽

Optical Polymer ◽

Polymer Optical Fibers ◽

Low Dispersion

This research introduces a numerical design of an air-core vortex polymer optical fiber in cyclic transparent optical polymer (CYTOP) that propagates 32 orbital angular momentum (OAM) modes, i.e., it may support up to 64 stable OAM-states considering left- and right-handed circular polarizations. This fiber seeks to be an alternative to increase the capacity of short-range optical communication systems multiplexed by modes, in agreement with the high demand of low-cost, insensitive-to-bending and easy-to-handle fibers similar to others optical fibers fabricated in polymers. This novel fiber possesses unique characteristics: a diameter of 50 µm that would allow a high mechanical compatibility with commercially available polymer optical fibers, a difference of effective index between neighbor OAM modes of around 10−4 over a bandwidth from 1 to 1.6 µm, propagation losses of approximately 15 × 10−3 dB/m for all OAM modes, and a very low dispersion for OAM higher order modes (±l = 16) of up to +2.5 ps/km-nm compared with OAM lower order modes at a telecom wavelength of 1.3 µm, in which the CYTOP exhibits a minimal attenuation. The spectra of mutual coupling coefficients between modes are computed considering small bends of up to 3 cm of radius and slight ellipticity in the ring of up to 5%. Results show lower-charge weights for higher order OAM modes.

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A simple, low-cost technique for in situ measurement of leaf P concentration in field-grown rice

Journal of Plant Nutrition and Soil Science ◽

10.1002/jpln.201800187 ◽

2018 ◽

Vol 182 (1) ◽

pp. 28-30

Author(s):

Koji Yamane ◽

Ranee C. Mabesa-Telosa ◽

Ryosuke Tajima ◽

Nino P. M. C. Banayo ◽

Yoichiro Kato

Keyword(s):

Low Cost ◽

In Situ Measurement ◽

P Concentration ◽

Leaf P

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Design of An Optical Fiber Sensor for in-situ Measurement of Temperature and Water Droplet Detection in a PEM Fuel Cell

ECS Meeting Abstracts ◽

10.1149/ma2012-02/13/1546 ◽

2012 ◽

Keyword(s):

Fuel Cell ◽

Optical Fiber ◽

Water Droplet ◽

Optical Fiber Sensor ◽

Pem Fuel Cell ◽

In Situ Measurement ◽

Fiber Sensor

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An Optical Fiber Chemical Sensor for the Detection of Copper(II) in Drinking Water

Sensors ◽

10.3390/s19235246 ◽

2019 ◽

Vol 19 (23) ◽

pp. 5246 ◽

Cited By ~ 3

Author(s):

Pesavento ◽

Profumo ◽

Merli ◽

Cucca ◽

Zeni ◽

...

Keyword(s):

Drinking Water ◽

Optical Fiber ◽

Optical Fibers ◽

Chemical Sensor ◽

Low Cost ◽

Self Assembled Monolayer ◽

Ph Values ◽

Highly Sensitive ◽

Selective Sensor

Highly sensitive plasmonic optical fiber platforms combined with receptors have been recently used to obtain selective sensors. A low-cost configuration can be obtained exploiting a D-shaped plastic optical fiber covered with a multilayer sensing surface. The multilayer consists of a gold film, functionalized with a specific receptor, where the surface plasmon resonance (SPR) occurs. The signal is produced by the refractive index variation occurring as a consequence of the receptor-to analyte binding. In this work, a selective sensor for copper(II) detection in drinking water, exploiting a self-assembled monolayer (SAM) of d,l-penicillamine as the sensing layer, has been developed and tested. Different concentrations of copper(II) in NaCl 0.1 M solutions at different pH values and in a real matrix (drinking water) have been considered. The results show that the sensor is able to sense copper(II) at concentrations ranging from 4 × 10-6 M to 2 × 10-4 M. The use of this optical chemical sensor is a very attractive perspective for fast, in situ and low-cost detection of Cu(II) in drinking water for human health concerns. Furthermore, the possibility of remote control is feasible as well, because optical fibers are employed.

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