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Optical Fibre Refractive Index Sensor in a Hybrid Fibre Grating Configuration (2015)
Journal Article
Alwis, L., Sun, T., & T.V. Grattan, K. (2015). Optical Fibre Refractive Index Sensor in a Hybrid Fibre Grating Configuration. Procedia Engineering, 120, 11-14. https://doi.org/10.1016/j.proeng.2015.08.555

A temperature compensated Refractive Index (RI) sensor incorporating a Long Period Grating (LPG) and a Fibre Bragg Grating (FBG) in a series configuration has been developed and evaluated. The LPG was used as a RI sensor allowing it to respond to ext... Read More about Optical Fibre Refractive Index Sensor in a Hybrid Fibre Grating Configuration.

A study of the impact of technology-enhanced learning on student academic performance. (2014)
Journal Article
Chowdhry, S., Sieler, K., & Alwis, L. (2014). A study of the impact of technology-enhanced learning on student academic performance. Journal of Perspectives in Applied Academic Practice, 2,

In university education a lot of emphasis is placed on the use of the virtual learning environment (VLE) in teaching to enhance the student learning experience. As a result, the academic staff is encouraged to use VLEs in different ways, including as... Read More about A study of the impact of technology-enhanced learning on student academic performance..

Fibre optic long period grating-based humidity sensor probe using a Michelson interferometric arrangement. (2013)
Journal Article
Alwis, L., Sun, T., & Grattan, K. T. V. (2013). Fibre optic long period grating-based humidity sensor probe using a Michelson interferometric arrangement. Sensors and Actuators B: Chemical, 178, 694-699. https://doi.org/10.1016/j.snb.2012.11.062

Long period gratings (LPG)-based sensors are widely used due to their high sensitivity to a range of suitable measurands. However, a typical configuration involving a single grating-based LPG sensor system frequently has the disadvantage of the probe... Read More about Fibre optic long period grating-based humidity sensor probe using a Michelson interferometric arrangement..

Design and performance evaluation of polyvinyl alcohol/polyimide coated optical fibre grating-based humidity sensors. (2013)
Journal Article
Alwis, L., Sun, T., & Grattan, K. T. V. (2013). Design and performance evaluation of polyvinyl alcohol/polyimide coated optical fibre grating-based humidity sensors. Review of Scientific Instruments, 84, 25002. https://doi.org/10.1063/1.4789768

Optical fibre grating based sensors make a significant contribution to relative humidity measurement for various applications and a number of different designs and sensor configurations have been produced and discussed in the literature. Recent devel... Read More about Design and performance evaluation of polyvinyl alcohol/polyimide coated optical fibre grating-based humidity sensors..

Analysis of Polyimide-Coated Optical Fiber Long-Period Grating-Based Relative Humidity Sensor (2013)
Journal Article
Alwis, L., Sun, T., & Grattan, K. T. V. (2013). Analysis of Polyimide-Coated Optical Fiber Long-Period Grating-Based Relative Humidity Sensor. IEEE Sensors Journal, 13, 767-771. https://doi.org/10.1109/JSEN.2012.2227714

A long-period grating (LPG)-based relative humidity (RH) sensor is developed, based on using a tailored layered polyimide coating on the grating region at the distal end of the fiber probe and allowing it to respond to humidity changes. The attenuati... Read More about Analysis of Polyimide-Coated Optical Fiber Long-Period Grating-Based Relative Humidity Sensor.

Analysis of the Characteristics of PVA-Coated LPG-Based Sensors to Coating Thickness and Changes in the External Refractive Index. (2013)
Journal Article
Alwis, L., Bremer, K., Sun, T., & Grattan, K. T. V. (2013). Analysis of the Characteristics of PVA-Coated LPG-Based Sensors to Coating Thickness and Changes in the External Refractive Index. IEEE Sensors Journal, 13, 1117-1124. https://doi.org/10.1109/JSEN.2012.2230534

Recent research has shown that the transmission spectrum of a long period grating (LPG) written into an optical fiber is sensitive to the thickness and the refractive index (RI) of a thin layer deposited on it, a concept which forms the basis of a nu... Read More about Analysis of the Characteristics of PVA-Coated LPG-Based Sensors to Coating Thickness and Changes in the External Refractive Index..

Optical fibre-based sensor technology for humidity and moisture measurement: Review of recent progress (2013)
Journal Article
Alwis, L., Sun, T., & Grattan, K. (2013). Optical fibre-based sensor technology for humidity and moisture measurement: Review of recent progress. Measurement : journal of the International Measurement Confederation, 46(10), 4052-4074. https://doi.org/10.1016/j.measurement.2013.07.030

Humidity and moisture sensing is becoming increasingly important in industry and through a wide spectrum of applications and a review of research activity in the field across a range of technologies was presented previously by some of the authors. Re... Read More about Optical fibre-based sensor technology for humidity and moisture measurement: Review of recent progress.

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.