Wavelet-based method for the suppression of ringing on force data taken during the extensional rheology of a non-Newtonian fluid polymer

Jeffrey R. Mackey; Ezzatollah Salari

doi:10.1117/12.456945

22 February 2002 Wavelet-based method for the suppression of ringing on force data taken during the extensional rheology of a non-Newtonian fluid polymer

Jeffrey R. Mackey, Ezzatollah Salari

Author Affiliations +

Proceedings Volume 4576, Advanced Environmental Sensing Technology II; (2002) https://doi.org/10.1117/12.456945
Event: Environmental and Industrial Sensing, 2001, Boston, MA, United States

Abstract

This paper describes the study of wavelet-based methods employed to de-noise a force transducer signal. This signal was extracted during the extensional deformation of a non-Newtonian polymer fluid. The non-Newtonian polymeric fluid was extensionally deformed with an exponentially increasing velocity profile. This velocity profile corresponded to a specific strain rate. Since the motion was stopped quickly (deceleration time was below 50ms for a complete stop), a serious problem of ringing occurred for approximately one second after the motion has ceased. The ringing manifested itself as a damped harmonic oscillation, which overrides the relaxation characteristics of the molecular structure within the boger fluid. In this paper, our goal was to suppress the damped harmonic oscillatory signal while preserving the relaxation characteristics (decaying exponential signal) of the force data. Several wavelet-based techniques provided acceptable noise suppression while preserving the signal of interest.

Citation Download Citation

Jeffrey R. Mackey and Ezzatollah Salari "Wavelet-based method for the suppression of ringing on force data taken during the extensional rheology of a non-Newtonian fluid polymer", Proc. SPIE 4576, Advanced Environmental Sensing Technology II, (22 February 2002); https://doi.org/10.1117/12.456945

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