Yeo, J T L (2007) Application of FBG-based sensors in built environment. PhD thesis, City, University of London, UK.
Abstract
Fibre Bragg grating (FBG)-based optical fire sensors have found numerous applications in various industries over nearly 20 years. The aim of this thesis is to address the technology gap identified through the exploration and development of a series of FBG-based sensors for structural health monitoring and required by industry. The primary objective of the work is to explore the use of polymer-coated FBGs as sensors in the cementious matrix to monitor moisture which is considered as a main agent involved in most of the chemical attacks, by transporting corrosive ions in concrete structures. The sensing concept used in this work exploits the inherent characteristics of the FBG and is based on the strain effect induced in the FBG through the swelling of the polymer coating. A direct indication of the moisture level is given by the shift of the Bragg wavelength caused by the expansion of the sensing material. The context of the work, both technical and applications-focuses and the development and characterisation of the sensors are discussed extensively in this thesis. The effectiveness of the sensors developed was evaluated through a series of tests performed under various harsh conditions using a range of concrete specimens with different porosity and mix composition, designed in collaboration with civil engineers. Results of the work are reported and relevant conclusions drawn for the use of this technology in the civil engineering sector, as well as incorporating a discussion of future trends and potential wider applications.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Uncontrolled Keywords: | built environment; civil engineering; collaboration; concrete structures; monitoring; sensors |
| Index terms: | agent, collaboration, exploration, coating, civil engineer, concrete structure, effectiveness, built environment, monitoring |
| Subjects: | structural engineering, practitioner, environmental resource management, management, performance management, infrastructure and transport systems, control systems, profession, building materials |
| Topics: | Quality Management, Engineering Principles, Sustainability, Urban Studies, Organizational Design, Site Management, Construction Materials, Roles and Professions |
| Descriptive scope: | 2 PC |
N.B. Descriptive scope is a count of how many of the five facets of empirical research are indicated by the words used in title, abstract and keywords. It is not intended as a judgement on the research; merely a count of the kind of word we would expect to indicate Phenomenon, Concepts, Theoretical framing, Empirical techniques, Analytical techniques. If all five are present, then a code of “5 PCTEA” will indicate this. If you feel the coding for this record is questionable, we welcome discussion around the terms we matched or the way we categorized them. The facet you would expect may not be coded, or a facet may be coded inappropriately. This can also bear on a larger question, of which facets should be treated as defining in construction management research. Please get in touch, and we will look at it. More details here