All Outputs (50)

Durability of functionalized carbon structures with optical fiber sensors in a highly alkaline concrete environment. (2019)
Journal Article
Bremer, K., Alwis, L., Zheng, Y., Weigand, F., Kuhne, M., Helbig, R., & Roth, B. (2019). Durability of functionalized carbon structures with optical fiber sensors in a highly alkaline concrete environment. Applied Sciences, 9(12), https://doi.org/10.3390/app9122476

The paper presents an investigation into the durability of functionalized carbon structures (FCS) in a highly alkaline concrete environment. First, the suitability of optical fibers with different coatings—i.e., acrylate, polyimide, or carbon—for the... Read More about Durability of functionalized carbon structures with optical fiber sensors in a highly alkaline concrete environment..

Intensity-modulated PM-PCF Sagnac loop in a DWDM setup for strain measurement (2019)
Journal Article
Alwis, L., Madry, M., & Beres-Pawlik, E. (2019). Intensity-modulated PM-PCF Sagnac loop in a DWDM setup for strain measurement. Applied Sciences, 9(11), https://doi.org/10.3390/app9112374

A novel intensity-modulated Sagnac loop sensor based on polarization-maintaining photonic crystal fiber (PM-PCF) in a setup with a dense wavelength division multiplexer (DWDM) for strain measurement is presented. The sensor head is made of PM-PCF spl... Read More about Intensity-modulated PM-PCF Sagnac loop in a DWDM setup for strain measurement.

Simultaneous Measurement of Temperature and Relative Humidity Using a Dual-Wavelength Erbium-Doped Fiber Ring Laser Sensor (2019)
Journal Article
Mądry, M., Alwis, L., Binetti, L., Pajewski, Ł., & Bereś-Pawlik, E. (2019). Simultaneous Measurement of Temperature and Relative Humidity Using a Dual-Wavelength Erbium-Doped Fiber Ring Laser Sensor. IEEE Sensors Journal, 19(20), 9215-9220. https://doi.org/10.1109/JSEN.2019.2922041

A fiber ring laser sensor setup utilizing FBGs (Fiber Bragg Gratings) for simultaneous measurement of ambient temperature and relative humidity (RH) is presented. Two FBGs are incorporated as tunable filters for a dual-wavelength laser emission, wher... Read More about Simultaneous Measurement of Temperature and Relative Humidity Using a Dual-Wavelength Erbium-Doped Fiber Ring Laser Sensor.

Optical Fiber-Based Heavy Metal Detection Using the Localized Surface Plasmon Resonance Technique (2019)
Journal Article
Dhara, P., Kumar, R., Binetti, L., Nguyen, H. T., Alwis, L. S., Sun, T., & Grattan, K. T. V. (2019). Optical Fiber-Based Heavy Metal Detection Using the Localized Surface Plasmon Resonance Technique. IEEE Sensors Journal, 19(19), 8720-8726. https://doi.org/10.1109/JSEN.2019.2921701

An innovative, reflection-based localized surface plasmon resonance (LSPR) fiber-optic sensor has been developed and demonstrated to detect the concentration of several heavy metal lead ions in an aqueous solution. By using a self-assembling techniqu... Read More about Optical Fiber-Based Heavy Metal Detection Using the Localized Surface Plasmon Resonance Technique.

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.

Graphene-Oxide and Hydrogel Coated FBG-Based pH Sensor for Biomedical Applications (2018)
Journal Article
Binetti, L., Stankiewicz, A., & Alwis, L. S. M. (2018). Graphene-Oxide and Hydrogel Coated FBG-Based pH Sensor for Biomedical Applications. Proceedings, 2(13), 789. https://doi.org/10.3390/proceedings2130789

A hydrogel coated fibre grating-based pH sensor for biomedical applications has been realised, where Graphene Oxide (GO) had been used to enhance the bonding between the coating and the fibre. Two methods of deposition of GO were analysed i.e., evapo... Read More about Graphene-Oxide and Hydrogel Coated FBG-Based pH Sensor for Biomedical Applications.

Smart Jewellery: The Future Of Health Monitoring (2018)
Presentation / Conference
Alwis, L. S., & Vones, K. (2018, November). Smart Jewellery: The Future Of Health Monitoring. Paper presented at U!REKA: Urban Research and Education Knowledge Alliance 2018, Frankfurt, Germany

The project has revolved around developing a responsive, wearable prototype object that creates playful interactions by sensing bodily and environmental stimuli, and expresses these through activating elements that consist of colour changing chromi... Read More about Smart Jewellery: The Future Of Health Monitoring.

Evaluating the Performance of Functionalized Carbon Structures with Integrated Optical Fiber Sensors under Practical Conditions (2018)
Journal Article
Bremer, K., Alwis S. M., L., Weigand, F., Kuhne, M., Zheng, Y., Krüger, M., …Roth, B. (2018). Evaluating the Performance of Functionalized Carbon Structures with Integrated Optical Fiber Sensors under Practical Conditions. Sensors, 18(11), 3923. https://doi.org/10.3390/s18113923

An Optical Frequency Domain Reflectometry (OFDR) based fiber optic sensor scheme “embedded” in concrete for the purpose of structural health monitoring (SHM) of carbon concrete composites (C3) is presented. The design, while strengthening the concret... Read More about Evaluating the Performance of Functionalized Carbon Structures with Integrated Optical Fiber Sensors under Practical Conditions.

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.

Optical Fibre Sensors technology towards smart cities concept (2017)
Presentation / Conference
Alwis, L. S., & Kerrouche, A. (2017, November). Optical Fibre Sensors technology towards smart cities concept. Presented at 2nd International Conference of the Urban Research and Education Knowledge Alliance, Edinburgh, Scotland

With the advancements in material sciences, the sensor research field is heading towards the implementation of an ultimate “nerves system” that can be utilized to sense various, if not all, physical, chemical and biological aspects not only of living... Read More about Optical Fibre Sensors technology towards smart cities concept.

Innovation in corrosion monitoring in sewers - use of novel photonic sensors for humidity measurements in gravity sewers (2017)
Journal Article
Bustamante, H., Alwis, L. S. M., Grattan, K. T. V., Sun, T., Vorreiter, L., & González, J. (2017). Innovation in corrosion monitoring in sewers - use of novel photonic sensors for humidity measurements in gravity sewers. Water e-journal, 2(4), 1-6. https://doi.org/10.21139/wej.2017.038

Humidity plays a key role in microbiologically induced corrosion of concrete gravity sewers. Minor reductions in humidity can reduce corrosion rates. No reliable long lived (>1 week) humidity sensors are available, thus limiting the development of us... Read More about Innovation in corrosion monitoring in sewers - use of novel photonic sensors for humidity measurements in gravity sewers.

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.

Structural Health Monitoring Using Textile Reinforcement Structures with Integrated Optical Fiber Sensors (2017)
Journal Article
Bremer, K., Weigand, F., Zheng, Y., Alwis, L. S., Helbig, R., & Roth, B. (2017). Structural Health Monitoring Using Textile Reinforcement Structures with Integrated Optical Fiber Sensors. Sensors, 17(2), 345. https://doi.org/10.3390/s17020345

Optical fiber-based sensors " embedded " in functionalized carbon structures (FCSs) and textile net structures (TNSs) based on alkaline-resistant glass are introduced for the purpose of structural health monitoring (SHM) of concrete-based structures.... Read More about Structural Health Monitoring Using Textile Reinforcement Structures with Integrated Optical Fiber Sensors.

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.

Fibre Grating-based Sensor Design for Humidity Measurement in Chemically Harsh Environment (2016)
Journal Article
Alwis, L. S. M., Sun, T., & Grattan, K. T. V. (2016). Fibre Grating-based Sensor Design for Humidity Measurement in Chemically Harsh Environment. Procedia Engineering, 168, 1317-1320. https://doi.org/10.1016/j.proeng.2016.11.359

A temperature compensated Relative Humidity (RH) sensor incorporating Fibre Bragg Gratings (FBGs) has been developed to be tested in extremely harsh gaseous acidic environment. One FBG is coated with moisture sensitive polymer while the other was use... Read More about Fibre Grating-based Sensor Design for Humidity Measurement in Chemically Harsh Environment.

Evaluation of the durability and performance of FBG-based sensors for monitoring moisture in an aggressive gaseous waste sewer environment (2016)
Journal Article
Alwis, L. S. M., Bustamante, H., Bremer, K., Roth, B., Sun, T., & Grattan, K. T. V. (2017). Evaluation of the durability and performance of FBG-based sensors for monitoring moisture in an aggressive gaseous waste sewer environment. Journal of Lightwave Technology, 35(16), 3380-3386. https://doi.org/10.1109/jlt.2016.2593260

Measurements of the rate of corrosion in concrete sewers need to take into consideration the humidity in the environment and thus its accurate measurement becomes critically important. Introducing a novel approach to do so, tailored Fiber Bragg grati... Read More about Evaluation of the durability and performance of FBG-based sensors for monitoring moisture in an aggressive gaseous waste 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.

[INVITED] Developments in optical fibre sensors for industrial applications (2015)
Journal Article
Alwis, L., Sun, T., & Grattan, K. (2015). [INVITED] Developments in optical fibre sensors for industrial applications. Optics and Laser Technology, 78(Part A), 62-66. https://doi.org/10.1016/j.optlastec.2015.09.004

The development of intrinsic optical fiber pH sensors based on fluorescence from novel coumarin dyes which are covalently immobilized onto the distal end of the fiber is described. The sensors provide response in the pH range of 0.5 − 6 with good sta... Read More about [INVITED] Developments in optical fibre sensors for industrial applications.