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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.

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.

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.

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.

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.

Optical Fiber Sensor Design for Ground Slope Movement Monitoring for Railway Safety Operations (2018)
Conference Proceeding
Hook, D., Laing, W., Kerrouche, A., Barreto Gonzalez, D., & Alwis, L. S. (2018). Optical Fiber Sensor Design for Ground Slope Movement Monitoring for Railway Safety Operations. In 2018 IEEE Sensors Proceedings (1-4). https://doi.org/10.1109/ICSENS.2018.8589835

Scour and slope instability are a major issue in keeping the railway structures safe and operational. Conventional measurement techniques do not allow real-time monitoring of slope movement and/or are time/resource consuming. Novel fiber optic techno... Read More about Optical Fiber Sensor Design for Ground Slope Movement Monitoring for Railway Safety Operations.

Integrated fiber Bragg grating incorporated textile carbon reinforcement structures (2017)
Conference Proceeding
Alwis, L., Bremer, K., Zheng, Y., Weigand, F., Kuhne, M., Helbig, R., & Roth, B. (2017). Integrated fiber Bragg grating incorporated textile carbon reinforcement structures. In 2017 IEEE Sensors. https://doi.org/10.1109/ICSENS.2017.8234106

An optical fibre Bragg grating (FBG) based strain sensor network incorporated in a functionalized textile-based carbon structure (FTCS) that can be used for structural health monitoring (SHM) is introduced. The aim of the design is not only to monito... Read More about Integrated fiber Bragg grating incorporated textile carbon reinforcement structures.

Fibre optic strain sensor for carbon concrete composites (2017)
Conference Proceeding
Bremer, K., Weigand, F., Zheng, Y., Alwis, L. S. M., Kuhne, M., Helbig, R., & Roth, B. (2017). Fibre optic strain sensor for carbon concrete composites. In 2017 European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference

The work introduces textile based carbon structures that are functionalized with optical fibre sensors for structural health monitoring (SHM) of concrete based composites. The concept of the functionalized carbon reinforcement structure is shown in F... Read More about Fibre optic strain sensor for carbon concrete composites.

Textile carbon reinforcement structures with integrated optical fibre sensors designed for SHM applications (2017)
Conference Proceeding
Alwis, L. S. M., Bremer, K., Weigand, F., Kuhne, M., Helbig, R., & Roth, B. (2017). Textile carbon reinforcement structures with integrated optical fibre sensors designed for SHM applications. In W. Jin, Y. Chung, B. Lee, J. Canning, K. Nakamura, & L. Yuan (Eds.), OFS-25 Proceedings. https://doi.org/10.1117/12.2264915

An optical fibre-based strain sensor “stitched” to a functionalised carbon structure (FCS) that can be used for structural health monitoring is introduced. The aim of the design is not only to monitor strain, but also to strengthen the structure. The... Read More about Textile carbon reinforcement structures with integrated optical fibre sensors designed for SHM applications.

A pilot study: Evaluation of sensor system design for optical fibre humidity sensors subjected to aggressive air sewer environment (2017)
Conference Proceeding
Alwis, L. S. M., Bustamante, H., Bremer, K., Roth, B., Sun, T., & Grattan, K. T. V. (2017). A pilot study: Evaluation of sensor system design for optical fibre humidity sensors subjected to aggressive air sewer environment. In 2016 IEEE SENSORS. https://doi.org/10.1109/icsens.2016.7808482

Research has identified that humidity plays a fundamental role on the conversion of hydrogen sulphide into sulphuric acid during corrosion of concrete in gravity sewers and that potentially minor reductions in humidity can reduce corrosion rates. The... Read More about A pilot study: Evaluation of sensor system design for optical fibre humidity sensors subjected to aggressive air sewer environment.

Temperature-compensated optimized relative humidity and refractive index sensors using a hybrid fibre grating configuration (2016)
Conference Proceeding
Alwis, L., Sun, T., & Grattan, K. T. V. (2016). Temperature-compensated optimized relative humidity and refractive index sensors using a hybrid fibre grating configuration. . https://doi.org/10.1109/icsens.2015.7370527

A temperature compensated Refractive Index sensor is formed using a combination of a Fibre Bragg Grating and a Long Period Grating fabricated together on a single optical fibre. The performance of the sensor was evaluated as an exemplar chemical sens... Read More about Temperature-compensated optimized relative humidity and refractive index sensors using a hybrid fibre grating configuration.

Characterization of a polyimide-coated humidity sensor in a hybrid fibre grating configuration (2015)
Conference Proceeding
Alwis, L., Sun, T., & Grattan, K. T. V. (2015). Characterization of a polyimide-coated humidity sensor in a hybrid fibre grating configuration. In J. L. Fabris, H. J. Kalinowski, & W. J. Bock (Eds.), . https://doi.org/10.1117/12.2193678

A Relative Humidity (RH) sensor incorporating a Long Period Grating (LPG) and a Fibre Bragg Grating (FBG) in a series configuration was developed and evaluated. The LPG was coated with polyimide allowing it to respond to humidity changes while the FB... Read More about Characterization of a polyimide-coated humidity sensor in a hybrid fibre grating configuration.

Optimization of a Long Period Grating Distal Probe for Temperature and Refractive Index Measurement (2012)
Conference Proceeding
Alwis, L., Sun, T., & Grattan, K. T. (2012). Optimization of a Long Period Grating Distal Probe for Temperature and Refractive Index Measurement. In 26th European Conference on Solid-State Transducers, EUROSENSOR 2012 (718-721). https://doi.org/10.1016/j.proeng.2012.09.248

Long Period Gratings (LPG)-based sensors are widely used due to their higher sensitivity to various measurands. However, a single grating based LPG sensor system has the disadvantage of the probe being used in transmission mode due to the broad bandw... Read More about Optimization of a Long Period Grating Distal Probe for Temperature and Refractive Index Measurement.

Refractive index sensor employing PVA-coated long period grating technology (2012)
Conference Proceeding
Alwis, L., Bremer, K., Sun, T., & Grattan, K. T. V. (2012). Refractive index sensor employing PVA-coated long period grating technology. In W. Jin, Y. Liao, D. D. Sampson, R. Yamauchi, Y. Chung, K. Nakamura, & Y. Rao (Eds.), Proceedings Volume 8421 OFS2012 22nd International Conference on Optical Fiber Sensor. https://doi.org/10.1117/12.974682

The sensitivity of a Long Period Grating (LPG)-based refractive index (RI) sensor has been enhanced through an appropriate coating of a thin polymer layer, with a higher RI than that of the cladding, on the LPG. The performance of the coated sensor,... Read More about Refractive index sensor employing PVA-coated long period grating technology.