A highly sensitive multiplexed FBG pressure transducer based on natural rubber diaphragm and ultrathin aluminium sheet

• Main Authors: Vorathin, E., Zohari, Mohd Hafizi, Aizzuddin, A.M., Lim, Kok Sing
• Format: Article
• Published: Elsevier 2018
• Subjects: Q Science (General); TJ Mechanical engineering and machinery
• Online Access: http://eprints.um.edu.my/20418/; https://doi.org/10.1016/j.optlastec.2018.04.003

Pressure measurement with a good sensitivity has always been a concern in most of the engineering applications and biomedical field. In this paper, a multiplexed FBG bonded on an ultrathin aluminium sheet which act as a cantilever deflected due to a deformation from a natural rubber based diaphragm has been proposed and studied. By using two gratings inscribed on a single optical fibre which senses the positive and negative strain has enhanced the sensitivity of the pressure transducer recorded at 329.56 pm/kPa or corresponding to 10.7893 kPa−1 across the range of 0 to 10 kPa with a good linearity of 99.76%. Furthermore, the thermal cross-sensitivity is compensated.