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Individual Cell-Level Temperature Monitoring of a Lithium-Ion Battery Pack (2023)
Journal Article
Alcock, K. M., González-Vila, Á., Beg, M., Vedreño-Santos, F., Cai, Z., Alwis, L. S. M., & Goh, K. (2023). Individual Cell-Level Temperature Monitoring of a Lithium-Ion Battery Pack. Sensors, 23(9), Article 4306. https://doi.org/10.3390/s23094306

The work described herein details the deployment of an optical fibre strand with five fibre Bragg grating (FBG) sensors for individual cell-level temperature monitoring of a three-cell lithium-ion battery pack. A polymer guide tube with 3D printed pl... Read More about Individual Cell-Level Temperature Monitoring of a Lithium-Ion Battery Pack.

Evaluation of Viscosity Dependence of the Critical Meniscus Height with Optical Fiber Sensors (2021)
Journal Article
Binetti, L., Simpson, F., & Alwis, L. S. M. (2021). Evaluation of Viscosity Dependence of the Critical Meniscus Height with Optical Fiber Sensors. Sensors, 21(23), Article 8130. https://doi.org/10.3390/s21238130

Conventional means of data extraction using optical fiber interrogators are not adequate for fast-paced detection of a target parameter. In this instance, the relationship between the critical meniscus heights (CMH) of several liquids to the extracti... Read More about Evaluation of Viscosity Dependence of the Critical Meniscus Height with Optical Fiber Sensors.

An Accessible Method of Embedding Fibre Optic Sensors on Lithium-ion Battery Surface for in-situ Thermal Monitoring (2021)
Journal Article
Alcock, K., Grammel, M., González-Vila, A., Binetti, L., Goh, K., & Alwis, L. (2021). An Accessible Method of Embedding Fibre Optic Sensors on Lithium-ion Battery Surface for in-situ Thermal Monitoring. Sensors and Actuators A: Physical, 332(1), Article 113061. https://doi.org/10.1016/j.sna.2021.113061

Presented is a proof of concept to evaluate the suitability of a mounting technique for fibre optic sensors (FOSs) to measure Lithium-ion Battery (LIB) temperature. Two mounting techniques for the optical fibre, i.e. containing multiple Fibre Bragg G... Read More about An Accessible Method of Embedding Fibre Optic Sensors on Lithium-ion Battery Surface for in-situ Thermal Monitoring.

Novel Technique for Meniscus Height Measurement of Liquids Using Optical Fibers (2021)
Journal Article
Binetti, L., & Alwis, L. S. M. (2021). Novel Technique for Meniscus Height Measurement of Liquids Using Optical Fibers. IEEE Sensors Journal, 21(18), 20092-20098. https://doi.org/10.1109/jsen.2021.3100644

A novel technique was designed to measure the meniscus height (MH) of liquids on a standard single mode fiber (SMF) using fiber optics. Once the MH is known, the contact angle could be calculated, and the surface tension of liquids can be determined.... Read More about Novel Technique for Meniscus Height Measurement of Liquids Using Optical Fibers.

Fiber Optic Sensors Embedded in Textile-Reinforced Concrete for Smart Structural Health Monitoring: A Review (2021)
Journal Article
Alwis, L. S. M., Bremer, K., & Roth, B. (2021). Fiber Optic Sensors Embedded in Textile-Reinforced Concrete for Smart Structural Health Monitoring: A Review. Sensors, 21(15), Article 4948. https://doi.org/10.3390/s21154948

The last decade has seen rapid developments in the areas of carbon fiber technology, additive manufacturing technology, sensor engineering, i.e., wearables, and new structural reinforcement techniques. These developments, although from different area... Read More about Fiber Optic Sensors Embedded in Textile-Reinforced Concrete for Smart Structural Health Monitoring: A Review.

Editorial on Special Issue “Modern Applications in Optics and Photonics: From Sensing and Analytics to Communication” (2021)
Journal Article
Alwis, L. S. M., Bremer, K., & Roth, B. (2021). Editorial on Special Issue “Modern Applications in Optics and Photonics: From Sensing and Analytics to Communication”. Applied Sciences, 11(4), Article 1589. https://doi.org/10.3390/app11041589

Note: In lieu of an abstract, this is an excerpt from the first page. Optics and photonics are among the key technologies of the 21st century and offer the potential for novel applications in areas as diverse as sensing and spectroscopy, analytics... Read More about Editorial on Special Issue “Modern Applications in Optics and Photonics: From Sensing and Analytics to Communication”.

Investigation on the sensitivity of an etched graded-index multi-mode fiber to refractive index and temperature for mode-multiplexed fiber optic sensor applications (2020)
Conference Proceeding
Alwis, L., Bremer, K., & Roth, B. (2020). Investigation on the sensitivity of an etched graded-index multi-mode fiber to refractive index and temperature for mode-multiplexed fiber optic sensor applications. In Optical Fiber Sensors Conference 2020 Special Edition. https://doi.org/10.1364/OFS.2020.T3.7

The work presents an investigation on the utilization of an etched Graded-Index (GI)-Multi-Mode Fiber (MMF) for mode-multiplexed Fiber Optic Sensor (FOS) applications and the simultaneous measurement of the Surrounding Refractive Index (SRI) The work... Read More about Investigation on the sensitivity of an etched graded-index multi-mode fiber to refractive index and temperature for mode-multiplexed fiber optic sensor applications.

Evaluation of the potential of Fiber Optic Sensors for Structural Health Monitoring of Carbon Fiber-Reinforced Concrete Composites (2020)
Conference Proceeding
Alwis, L., Bremer, K., Weigand, F., Kuhne, M., Helbig, R., & Roth, B. (2020). Evaluation of the potential of Fiber Optic Sensors for Structural Health Monitoring of Carbon Fiber-Reinforced Concrete Composites. In G. Cranch, A. Wang, M. Digonnet, & P. Dragic (Eds.), Optical Fiber Sensors Conference 2020 Special Edition. https://doi.org/10.1364/OFS.2020.W4.66

The paper presents an evaluation on the structural and operational potential of fiber optic sensors (FOSs) to be utilized for real-time continuous structural health monitoring (SHM) of fiber-reinforced carbon concrete composites (C3).

Feasibility Study on the Potential of Fibre Bragg Gratings for Thermal Monitoring of Cylindrical Lithium-Ion Batteries (2020)
Conference Proceeding
Alcock, K., Grammel, M., Binetti, L., Gonzales Vila, A., Goh, K., & Alwis, L. (2020). Feasibility Study on the Potential of Fibre Bragg Gratings for Thermal Monitoring of Cylindrical Lithium-Ion Batteries. In G. Cranch, A. Wang, M. Digonnet, & P. Dragic (Eds.), Optical Fiber Sensors Conference 2020 Special Edition. https://doi.org/10.1364/OFS.2020.T3.49

Bragg Gratings were used to monitor thermal fluctuations of a Lithium-Ion battery by attaching the sensors outside the casing of the battery. Results are comparable to that obtained from thermo-couples and thus verifies its potential.

Design a Monitoring System For Pathogen Detection Using Microfluidic Technology (2020)
Conference Proceeding
Kerrouche, A., Lithgow, J., & Alwis, L. (2020). Design a Monitoring System For Pathogen Detection Using Microfluidic Technology. In G. Cranch, A. Wang, M. Digonnet, & P. Dragic (Eds.), Optical Fiber Sensors Conference 2020 Special Edition. https://doi.org/10.1364/OFS.2020.Th4.6

Waterborne pathogens affect all waters globally and proceed to be a ongoing concern. The act to provide clean water by filtration is effective although has concerns. Previous methods for detection and removal of pathogens consist of a... Read More about Design a Monitoring System For Pathogen Detection Using Microfluidic Technology.

All-Optical Planar Polymer Waveguide-Based Biosensor Chip Designed for Smartphone-Assisted Detection of Vitamin D (2020)
Journal Article
Walter, J., Alwis, L. S. M., Roth, B., & Bremer, K. (2020). All-Optical Planar Polymer Waveguide-Based Biosensor Chip Designed for Smartphone-Assisted Detection of Vitamin D. Sensors, 20(23), Article 6771. https://doi.org/10.3390/s20236771

An all-optical plasmonic sensor platform designed for smartphones based on planar-optical waveguide structures integrated in a polymer chip is reported for the first time. To demonstrate the applicability of the sensor system for biosensing purposes,... Read More about All-Optical Planar Polymer Waveguide-Based Biosensor Chip Designed for Smartphone-Assisted Detection of Vitamin D.

Monitoring of the Critical Meniscus of Very Low Liquid Volumes Using an Optical Fiber Sensor (2020)
Journal Article
Binetti, L., Del Villar, I., Prabuddha Dissanayake, K., Stankiewicz, A., Sun, T., Grattan, K. T. V., & Alwis, L. S. M. (2020). Monitoring of the Critical Meniscus of Very Low Liquid Volumes Using an Optical Fiber Sensor. IEEE Sensors Journal, 20(20), 12232-12240. https://doi.org/10.1109/JSEN.2020.2999537

A novel sensing system based on single mode optical fiber in reflective configuration has been developed to measure the critical meniscus height (CMH) of low volumes of liquids, which is then used to calculate the contact angle. The sensing system ha... Read More about Monitoring of the Critical Meniscus of Very Low Liquid Volumes Using an Optical Fiber Sensor.

Optical fibre thermometry using ratiometric green emission of an upconverting nanoparticle- polydimethylsiloxane composite (2020)
Journal Article
Kumar, R., Binetti, L., Nguyen, .. H., Alwis, L. S., Sun, T., & Grattan, K. T. (2020). Optical fibre thermometry using ratiometric green emission of an upconverting nanoparticle- polydimethylsiloxane composite. Sensors and Actuators A: Physical, 312, Article 112083. https://doi.org/10.1016/j.sna.2020.112083

The thermally coupled green band emission from excited Er 3+ ions has been used in the past to create optical thermometers, by doping the material in various types of media, particularly glasses. Glasses are known to be excellent hosts for Er 3+ ions... Read More about Optical fibre thermometry using ratiometric green emission of an upconverting nanoparticle- polydimethylsiloxane composite.

SPR biosensor based on polymer multi-mode optical waveguide and nanoparticle signal enhancement (2020)
Journal Article
Gabriela Walter, J., Eilers, A., Alwis, L., Wilhelm Roth, B., & Bremer, K. (2020). SPR biosensor based on polymer multi-mode optical waveguide and nanoparticle signal enhancement. Sensors, 20(10), Article 2889. https://doi.org/10.3390/s20102889

We present a surface plasmon resonance (SPR) biosensor that is based on a planar-optical multi-mode (MM) polymer waveguide structure applied for the detection of biomolecules in the lower nano-molar (nM) range. The basic sensor shows a sensitivity of... Read More about SPR biosensor based on polymer multi-mode optical waveguide and nanoparticle signal enhancement.

Micro-structured optical multi-mode fibers for sensing applications (2020)
Conference Proceeding
Bremer, K., Alwis, L., & Roth, B. (2020). Micro-structured optical multi-mode fibers for sensing applications. In Proceedings Volume 11355, Micro-Structured and Specialty Optical Fibres VI. https://doi.org/10.1117/12.2563899

Grating-based Fiber Optic Sensors (FOSs), i.e. relying on Bragg Gratings (BGs), Long Period Gratings (LPGs), Tilted Fiber BGs (TFBGs), have seen a popularity in recent years for sensing applications, however, most of these are inscribed on Single-Mod... Read More about Micro-structured optical multi-mode fibers for sensing applications.

Towards Mode-Multiplexed Fiber Sensors: An Investigation on the Spectral Response of Etched Graded Index OM4 Multi-Mode Fiber with Bragg grating for Refractive Index and Temperature Measurement (2020)
Journal Article
Bremer, K., Alwis, L. S. M., Zheng, Y., & Roth, B. W. (2020). Towards Mode-Multiplexed Fiber Sensors: An Investigation on the Spectral Response of Etched Graded Index OM4 Multi-Mode Fiber with Bragg grating for Refractive Index and Temperature Measurement. Applied Sciences, 10(1), Article 337. https://doi.org/10.3390/app10010337

An investigation on the feasibility of utilizing Mode Division Multiplexing (MDM) for simultaneous measurement of Surrounding Refractive Index (SRI) and temperature using a single sensor element based on an etched OM4 Graded Index Multi Mode Fiber (G... Read More about Towards Mode-Multiplexed Fiber Sensors: An Investigation on the Spectral Response of Etched Graded Index OM4 Multi-Mode Fiber with Bragg grating for Refractive Index and Temperature Measurement.

External Refractive Index Sensitivity Enhancement of a Long Period Grating by Graphene Oxide Overlay (2019)
Conference Proceeding
Dissanayake, K., Ghosh, S., Binetti, L., Rente, B., Alwis, L., Sun, T., & Grattan, K. (2019). External Refractive Index Sensitivity Enhancement of a Long Period Grating by Graphene Oxide Overlay.

In this paper, an external refractive index sensor is presented based on a graphene oxide coated long period grating and based on creating a stable graphene oxide coating on the fibre surface using a drop casting technique. The wavelength shift sensi... Read More about External Refractive Index Sensitivity Enhancement of a Long Period Grating by Graphene Oxide Overlay.

Determination of the Aspect-ratio Distribution of Gold Nanorods in a Colloidal Solution using UV-visible absorption spectroscopy (2019)
Journal Article
Kumar, R., Binetti, L., Nguyen, H. T., Alwis, L. S. M., Agrawal, A., Sun, T., & Grattan, K. T. V. (2019). Determination of the Aspect-ratio Distribution of Gold Nanorods in a Colloidal Solution using UV-visible absorption spectroscopy. Scientific Reports, 9, Article 17469. https://doi.org/10.1038/s41598-019-53621-4

Knowledge of the distribution of the aspect ratios (ARs) in a chemically-synthesized colloidal solution of Gold Nano Rods (GNRs) is an important measure in determining the quality of synthesis, and consequently the performance of the GNRs generated f... Read More about Determination of the Aspect-ratio Distribution of Gold Nanorods in a Colloidal Solution using UV-visible absorption spectroscopy.

Functionalized Carbon Reinforcement Structures with Optical Fibre Sensors for Carbon Concrete Composites (2019)
Conference Proceeding
Bremer, K., Alwis, L. S. M., Weigand, F., Kuhne, M., Heibig, R., & Roth, B. (2019). Functionalized Carbon Reinforcement Structures with Optical Fibre Sensors for Carbon Concrete Composites. . https://doi.org/10.1109/cleoe-eqec.2019.8872285

Here we present our latest efforts in the development of functionalized carbon reinforcement structures (FCSs). FCSs are textile based carbon structures that are functionalized with optical fibre sensors and are designed for the reinforcement as well... Read More about Functionalized Carbon Reinforcement Structures with Optical Fibre Sensors for Carbon Concrete Composites.

Measurement of viscoelasticity of sodium alginate by Fibre Bragg Grating (2019)
Conference Proceeding
Binetti, L., Stankiewicz, A., & Alwis, L. (2019). Measurement of viscoelasticity of sodium alginate by Fibre Bragg Grating. . https://doi.org/10.3390/proceedings2019015033

A novel sensor for measuring viscoelastic properties of sodium alginate (SA) in distilled water of concentration (0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 w/w%) has been tested. The sensor used is an FBG (Fiber Bragg Grating) fibre optic sensor. It has seen... Read More about Measurement of viscoelasticity of sodium alginate by Fibre Bragg Grating.