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Title of article :
extrapolation of calibration curve of hot-wire spirometer using a novel neural network based approach
Author/Authors :
ardekani، mohammad ali نويسنده Departments of Mechanical Engineering , , nafisi، Vahid reza نويسنده Departments of Electrical and Computer, Biomedical Engineering Group. , , farhani، foad نويسنده Departments of Mechanical Engineering ,
Issue Information :
فصلنامه با شماره پیاپی 0 سال 2012
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Abstract :
Hot-wire spirometer is a kind of constant temperature anemometer (CTA). The working principle of CTA, used for the measurement of fluid velocity and flow turbulence, is based on convective heat transfer from a hot?wire sensor to a fluid being measured. The calibration curve of a CTA is nonlinear and cannot be easily extrapolated beyond its calibration range. Therefore, a method for extrapolation of CTA calibration curve will be of great practical application. In this paper, a novel approach based on the conventional neural network and self?organizing map (SOM) method has been proposed to extrapolate CTA calibration curve for measurement of velocity in the range 0.7?30 m/seconds. Results show that, using this approach for the extrapolation of the CTA calibration curve beyond its upper limit, the standard deviation is about ?0.5%, which is acceptable in most cases. Moreover, this approach for the extrapolation of the CTA calibration curve below its lower limit produces standard deviation of about 4.5%, which is acceptable in spirometry applications. Finally, the standard deviation on the whole measurement range (0.7?30 m/s) is about 1.5%.
Journal title :
Journal of Medical Signals and Sensors (JMSS)
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