Abstract
In this work, a new distributed pressure measurement system is presented
that is based on multiplexed in-fibre Bragg gratings housed within a
flexible superstructure. The sensor superstructure comprises hypodermic
tubing and several spacers and pressure diaphragms that together define the
sensing locations and provide mechanical support to the Bragg gratings.
Linear elasticity and strain-optic models are used to predict sensor
performance in terms of sensitivity to hydrostatic pressure. Model
predictions are validated through experimental calibration and indicate
pressure sensitivities as high as 2.94 nm/MPa (MegaPascal) for a prototype
with 1 mm outside diameter. The maximum measurement error from all
calibration experiments is 3.4% of full-scale applied pressure. To the
authors' knowledge, this is the smallest reported multiplexed pressure
sensor that is based on Bragg gratings. Due to its small size, this sensor
could potentially be applied in medical applications that existing sensors
are too large for, specifically in angiography procedures for coronary
arteries.
© 2011 IEEE
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