Fibre optic Fabry-Perot interferometric pressure sensors have proved many orders of excellent mea... more Fibre optic Fabry-Perot interferometric pressure sensors have proved many orders of excellent measurements system, but they suffer from limitations in sensitivity and resolution caused by the trade-off in designing the sensor when very thin diaphragm is needed. By reducing the diaphragm thickness increases the deflection range, but reduces the diaphragm strength and therefore increases the risk of mechanical failure. The pressure sensor has been designed and its fabrication process using MEMS techniques is explained. This paper proposes a new diaphragm material for the fibre optic Fabry-Perot pressure sensor. Using a Polydimethylsiloxane (PDMS), the limitation on sensor resolution and sensitivity are overcome. The goal of this research is to design and analyze the PDMS diaphragm to enhance the consistency and sustainability of fibre optic Fabry-Perot pressure sensor for medical measurements which require a minimum resolution of ~1 mmHg over all the physiological pressure range (~300 mmHg) [1,2]. Comparisons of theoretical and simulation with Coventor Ware simulator on mechanical part of the pressure sensor are made. Also, an explanation viewing the sensor's diaphragm stability is provided.
ABSTRACT This study determines the intrusiveness of endoscopic tools within multiphase flows. A l... more ABSTRACT This study determines the intrusiveness of endoscopic tools within multiphase flows. A liquid-air blast atomiser continuously discharges within a test section of air at atmospheric pressure, with and without a circular cylinder placed 25 diameters (D = 10 mm) downstream of the nozzle. Data was collected using Particle Image Velocimetry (PIV), drop sizing and Computational Fluid Dynamics (CFD). Numerical predictions are compared against the PIV results for wake flow characterisation. Using a non-intrusive droplet sizing technique it has been observed that the average droplet diameter increases when the circular cylinder is introduced and so does the frequency of occurrence of these large particles. Smaller particles are re-circulated, whereas the larger drops continued in the general direction of the spray cone.
Fibre optic Fabry-Perot interferometric pressure sensors have proved many orders of excellent mea... more Fibre optic Fabry-Perot interferometric pressure sensors have proved many orders of excellent measurements system, but they suffer from limitations in sensitivity and resolution caused by the trade-off in designing the sensor when very thin diaphragm is needed. By reducing the diaphragm thickness increases the deflection range, but reduces the diaphragm strength and therefore increases the risk of mechanical failure. The pressure sensor has been designed and its fabrication process using MEMS techniques is explained. This paper proposes a new diaphragm material for the fibre optic Fabry-Perot pressure sensor. Using a Polydimethylsiloxane (PDMS), the limitation on sensor resolution and sensitivity are overcome. The goal of this research is to design and analyze the PDMS diaphragm to enhance the consistency and sustainability of fibre optic Fabry-Perot pressure sensor for medical measurements which require a minimum resolution of ~1 mmHg over all the physiological pressure range (~300 mmHg) [1,2]. Comparisons of theoretical and simulation with Coventor Ware simulator on mechanical part of the pressure sensor are made. Also, an explanation viewing the sensor's diaphragm stability is provided.
ABSTRACT This study determines the intrusiveness of endoscopic tools within multiphase flows. A l... more ABSTRACT This study determines the intrusiveness of endoscopic tools within multiphase flows. A liquid-air blast atomiser continuously discharges within a test section of air at atmospheric pressure, with and without a circular cylinder placed 25 diameters (D = 10 mm) downstream of the nozzle. Data was collected using Particle Image Velocimetry (PIV), drop sizing and Computational Fluid Dynamics (CFD). Numerical predictions are compared against the PIV results for wake flow characterisation. Using a non-intrusive droplet sizing technique it has been observed that the average droplet diameter increases when the circular cylinder is introduced and so does the frequency of occurrence of these large particles. Smaller particles are re-circulated, whereas the larger drops continued in the general direction of the spray cone.
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Papers by MUHAMAD SAID