A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Geotechnical and Structural Applications of Fiber-Optic Sensing
Abstract Fiber-optic (FO) strain sensors are offering new monitoring possibilities. By integrating FO sensors into soil or structure, an unprecedented amount of accurate, (and spatially resolved in case of distributed sensors) data can be obtained. In the early twenties of the 20th century, two important types of light scattering were discovered: Raman scatter (Raman 1928) and Brioullin scatter (Brillouin 1922). The Raman scatter is often used in distributed temperature sensing (DTS) whereas the Brioullin scatter forms the basis of most current FO distributed strain measurement techniques. These discoveries opened up the possibilities of current optical sensor technology. Only with the development of laser technology, combined with fast signal processing, this has resulted in the rise of optical sensor applications from the late nineties of the 20th century. Supplemented with the Fiber Bragg Grating (FBG) technology (Hill et al. 1978), which allows for extremely accurate and fast strain measurement acquisition, most imaginable strain and temperature measurement configurations have become possible. The development and application in projects was expected to rise as measurement equipment was expected to become more affordable (Spruit et al. 2003). Due to logical market restraints (low demand due to high equipment pricing resulted in low production volume which kept the prices up), the improvement of affordability of the measurement equipment has taken longer than expected in the beginning of the 21st century. Looking at current long-term monitoring projects and papers published on these subjects, the application of optical sensor technology is really starting to take off now. Current commercially available technology allows for strain measurements in the microstrain (με) range (0.0001%) with a spatial resolution of 1 m along a 30 km long fiber. In this paper a description of geotechnical and structural FO applications in the laboratory and field of the last 15 years are given. These range from preliminary test, through pilots and long term structural health monitoring. This paper will show some pilot monitoring projects in civil engineering from the start of the 21st century. More extensively, a recent example of monitoring a bridge will be discussed.
Geotechnical and Structural Applications of Fiber-Optic Sensing
Abstract Fiber-optic (FO) strain sensors are offering new monitoring possibilities. By integrating FO sensors into soil or structure, an unprecedented amount of accurate, (and spatially resolved in case of distributed sensors) data can be obtained. In the early twenties of the 20th century, two important types of light scattering were discovered: Raman scatter (Raman 1928) and Brioullin scatter (Brillouin 1922). The Raman scatter is often used in distributed temperature sensing (DTS) whereas the Brioullin scatter forms the basis of most current FO distributed strain measurement techniques. These discoveries opened up the possibilities of current optical sensor technology. Only with the development of laser technology, combined with fast signal processing, this has resulted in the rise of optical sensor applications from the late nineties of the 20th century. Supplemented with the Fiber Bragg Grating (FBG) technology (Hill et al. 1978), which allows for extremely accurate and fast strain measurement acquisition, most imaginable strain and temperature measurement configurations have become possible. The development and application in projects was expected to rise as measurement equipment was expected to become more affordable (Spruit et al. 2003). Due to logical market restraints (low demand due to high equipment pricing resulted in low production volume which kept the prices up), the improvement of affordability of the measurement equipment has taken longer than expected in the beginning of the 21st century. Looking at current long-term monitoring projects and papers published on these subjects, the application of optical sensor technology is really starting to take off now. Current commercially available technology allows for strain measurements in the microstrain (με) range (0.0001%) with a spatial resolution of 1 m along a 30 km long fiber. In this paper a description of geotechnical and structural FO applications in the laboratory and field of the last 15 years are given. These range from preliminary test, through pilots and long term structural health monitoring. This paper will show some pilot monitoring projects in civil engineering from the start of the 21st century. More extensively, a recent example of monitoring a bridge will be discussed.
Geotechnical and Structural Applications of Fiber-Optic Sensing
Ravenzwaaij, Jeroen (author) / Iten, Michael (author) / Spruit, Rodriaan (author) / Boer, Ane (author)
2017-08-06
12 pages
Article/Chapter (Book)
Electronic Resource
English
Advanced Geotechnical Applications of Distributed Fiber-Optic Sensing
| Online Contents | 2010
Novel applications of distributed fiber-optic sensing in geotechnical engineering
| UB Braunschweig | 2011
Novel applications of distributed fiber-optic sensing in geotechnical engineering
| UB Braunschweig | 2012