Identifying fabrication defects of metal packaged fibre Bragg grating sensors for smart pre-stressing strands

Mckeeman, I.; Niewczas, Paweł; Johnston, Michael B.

doi:10.1109/eesms.2015.7175853

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Calibration Of Temperature Sensors1

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2016

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“…Sensors with defective brazing joints can be discovered during the temperature calibration process [29].…”

Section: Calibration Of Temperature Sensorsmentioning

confidence: 99%

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First-time demonstration of measuring concrete prestress levels with metal packaged fibre optic sensors

Mckeeman

Fusiek

Perry

et al. 2016

Smart Mater. Struct.

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Abstract.In this work we present the first large-scale demonstration of metal packaged fibre Bragg grating sensors developed to monitor prestress levels in prestressed concrete. To validate the technology, strain and temperature sensors were mounted on steel prestressing strands in concrete beams and stressed up to 60% of the ultimate tensile strength of the strand. We discuss the methods and calibration procedures used to fabricate and attach the temperature and strain sensors. The use of induction brazing for packaging the fibre Bragg gratings and welding the sensors to prestressing strands eliminates the use of epoxy, making the technique suitable for high-stress monitoring in an irradiated, harsh industrial environment. Initial results based on the first week of data after stressing the beams show the strain sensors are able to monitor prestress levels in ambient conditions.First-time demonstration of measuring concrete prestress levels with metal packaged distributed fibre optic sensors2

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“…Sensors with defective brazing joints can be discovered during the temperature calibration process [29].…”

Section: Calibration Of Temperature Sensorsmentioning

confidence: 99%

“…An average temperature sensitivity of 15.2 pm/ C• was determined. Sensors with defective brazing joints can be discovered during the temperature calibration process[29].…”

mentioning

confidence: 99%