Resolution enhancement of ultrasonic imaging at oblique incidence by using WTFM based on FMC-AR

The total focusing method (TFM) implemented in time domain has high complexity, limiting its large-scale engineering applications. In contrast, the frequency-domain TFM based on phase shift migration (PSM) is helpful to improve imaging efficiency. On this basis, partial data can be abandoned for imaging to save computing costs and shorten processing time without reducing imaging quality. In this paper, an adaptive sparse-TFM in the frequency domain is proposed by selecting desired signals from full matrix capture (FMC) data. The amplitude-squared parameter for all the received signals corresponding to each transmitting element is taken as the relevant weight, and sparse arrays are constructed adaptively according to the descending order of numerical values. Simulated and experimental results indicate that the proposed method has stable imaging quality under different sparsity ratios, rapidly improving imaging efficiency with good resolution for defect detection.

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Reducing Dead Zone in Ultrasonic Time-of-Flight Diffraction (TOFD): A Review

Jin,

Sun,

Luo

2024

Russ J Nondestruct Test

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Resolution enhancement of ultrasonic imaging at oblique incidence by using WTFM based on FMC-AR

Cited by 5 publications

References 34 publications

Ultrasonic phased array imaging of multi-layered structures using full-matrix migration and normalized cross-correlation matching technique

Ultrasonic phased array imaging of multi-layered structures using full-matrix migration and normalized cross-correlation matching technique

Sparse-TFM imaging in frequency domain based on amplitude-squared parameter

Reducing Dead Zone in Ultrasonic Time-of-Flight Diffraction (TOFD): A Review

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