DocumentCode :
2594873
Title :
A system identification model for ultrasonic characterization of a swollen PVA hydrogel
Author :
Lohakan, M. ; Jamnongkan, T. ; Kaewpirom, S. ; Boonsang, S.
Author_Institution :
Dept. of Electron., King Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok
Volume :
2
fYear :
2008
fDate :
14-17 May 2008
Firstpage :
625
Lastpage :
628
Abstract :
In this paper, the development of an ultrasonic characterization method for Poly-Vinyl Alcohol (PVA) hydrogel incorporating diffraction effects is purposed. The Lommel integral, diffraction correction procedure, is applied to the model. Nonlinear least square algorithm, iterative computation in forward model, is employed to minimize the error of the predicted parameters efficiently. To validate the model, the ultrasonic signal is measured in the reflection mode experiment. The system consists of PVA hydrogel as a testing sample immersed in water tank and 10 MHz unfocused piston transducer. Before the transducer is utilized to generate the ultrasonic beam, the alignment between sample and transducer must proceed to get the maximum spectrum of the ultrasonic incident beam. The properties of PVA hydrogel in the experimental results are shown in density, dispersion and thickness in micron scale. Finally, the purposed model has potential to estimate other parameters such as the scatterer size in future work.
Keywords :
integral equations; iterative methods; least squares approximations; polymer gels; ultrasonic materials testing; ultrasonic transducers; Lommel integral; diffraction correction procedure; diffraction effects; iterative computation; nonlinear least square algorithm; piston transducer; poly-vinyl alcohol; swollen PVA hydrogel; system identification model; ultrasonic characterization; water tank; Computational modeling; Diffraction; Iterative algorithms; Least squares methods; Optical reflection; Predictive models; System identification; System testing; Ultrasonic transducers; Ultrasonic variables measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, 2008. ECTI-CON 2008. 5th International Conference on
Conference_Location :
Krabi
Print_ISBN :
978-1-4244-2101-5
Electronic_ISBN :
978-1-4244-2102-2
Type :
conf
DOI :
10.1109/ECTICON.2008.4600511
Filename :
4600511
Link To Document :
بازگشت