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Can I use filter on the guided wave for helping to calculate the velocity change rate?

Wave propagation

Dispersion relation

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Yes, a filter can be used on guided waves to help calculate the velocity change rate. The phase velocity filter described by Adams et al. is able to extract wavelets of a particular phase velocity irrespective of frequency, allowing for the acquisition of dispersion relation with reduced artifacts and the ability to extract modes across the full bandwidth of the excitation . Additionally, Luppescu et al. propose the use of a dispersive matched filter that maximizes the autocorrelation for only one mode, improving the signal-to-noise ratio and time-resolution of ultrasonic guided wave measurements . These techniques demonstrate the potential for using filters to enhance the analysis and interpretation of guided wave data.

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Patent Guided electromagnetic wave filter device Deepak Uttamchandani, Lijie Li, David R. S. Cumming, Timothy D. Drysdale - Show less +3 more 03 Apr 2006 1 Citations	The paper does not mention anything about using the filter on the guided wave to calculate the velocity change rate. The paper is about a guided electromagnetic radiation filter or switch device.
Open access•Proceedings Article•DOI A phase velocity filter for the measurement of lamb wave dispersion Chris J. Adams, Sevan Harput, David M. J. Cowell, Steven Freear - Show less +3 more 03 Nov 2016 4 Citations	No, the paper does not mention using a filter to calculate the velocity change rate of guided waves.
Open access•Proceedings Article•DOI Dispersive matched filtering of ultrasonic guided waves for improved sparse array damage localization Gregory C. Luppescu, Alexander J. Dawson, Jennifer E. Michaels - Show less +2 more 10 Feb 2016 6 Citations	No, the paper does not mention using a filter to calculate the velocity change rate of guided waves.
Patent Guided wave spatial filter Robert Graham Walker 08 Oct 2001 178 Citations	The provided paper does not mention anything about using the filter on the guided wave to calculate the velocity change rate.

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