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Proceedings Paper

Fibre Bragg grating based effective soil pressure sensor for geotechnical applications
Author(s): Ricardo Correia; Jin Li; Stephen Staines; Edmon Chehura; Stephen W. James; Joel Kutner; Paul Dewhurst; Pedro Ferreira; Ralph P. Tatam
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Paper Abstract

An effective-soil-pressure sensor for geotechnical applications based on Fibre Bragg Gratings is presented. The sensor simultaneous measures total soil pressure and pore pressure, allowing the calculation of the effective stress of soil. Calibration of the sensor using pressurised air demonstrated a pressure sensitivity of 2.02x10-3 ± 2.84x10-5nm/kPa and 1.87x10-3 ± 6.88x10-5nm/kPa for the total and pore pressure respectively. This corresponds to a pressure resolution of 4.95x10-1kPa and 5.46x10-1kPa for total and pore pressure using a 1pm interrogation system. Measurements undertaken in two types of soil demonstrated dependence of the total pressure sensitivity on soil density/stiffness. Pore pressure measurements agreed well with the preliminary calibration.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75030F (5 October 2009); doi: 10.1117/12.835751
Show Author Affiliations
Ricardo Correia, Cranfield Univ. (United Kingdom)
Jin Li, Cranfield Univ. (United Kingdom)
Stephen Staines, Cranfield Univ. (United Kingdom)
Edmon Chehura, Cranfield Univ. (United Kingdom)
Stephen W. James, Cranfield Univ. (United Kingdom)
Joel Kutner, Univ. College London (United Kingdom)
Paul Dewhurst, Univ. College London (United Kingdom)
Pedro Ferreira, Univ. College London (United Kingdom)
Ralph P. Tatam, Cranfield Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors

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