Instantaneous Frequency Estimation of Ultrasonic Testing Signal Based on Matching Pursuits

Abstract:

The differences of instantaneous frequency (IF) characteristics between the defect echo and the noise can be used to detect defect and suppress noise for ultrasonic testing signal. Therefore, the IF is one of the important instantaneous parameters of ultrasonic testing signal. To estimate the IF of ultrasonic testing signals more effectively, the peak of time-frequency representation (TFR) from matching pursuits (MP) decomposition is proposed. The performances of IF estimators are compared on the simulated signals at different signal-to-noise ratio (SNR) and the real ultrasonic testing signal. The simulation results present that the proposed method can estimate accurate IF at different SNR.

• Periodical: Advanced Materials Research (Volumes 631-632)
• Pages: 1367-1372
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.631-632.1367
• Online since: January 2013
• Authors: Xiu Li Du
• Keywords: Instantaneous Frequency, Matching Pursuits, Peak, Time-Frequency, Ultrasonic Testing (UT)

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