Improving Ultrasonic Imaging of Aluminum Plates using Phase Modulation
| Autor: | Rafael Mateus Tischer, Cláudio Kitano, Vander Teixeira Prado, Ricardo Tokio Higuti |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), UTFPR (Univ. Tecnonógica Federal do Paraná) |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Ul-trasonic imaging business.industry chemistry.chemical_element Instantaneous phase Pearson product-moment correlation coefficient Ultrasonic imaging symbols.namesake Optics Phase modulation chemistry Aluminium Nondestructive testing Instantaneous Phase Pearson correlation coefficient symbols Electrical and Electronic Engineering business |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 1872-0234 1807-1953 |
| DOI: | 10.29292/jics.v15i3.191 |
| Popis: | Made available in DSpace on 2021-06-25T11:09:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conventional techniques for ultrasonic image beamforming use amplitude information to produce the im-ages. Although amplitude images can be obtained with high quality, they can also present limitations regarding dead zone, artifacts and detection of far reflectors. Coherence techniques based on signal phase result in images that can be used to in-dicate the presence of a defect or reflector, with improve-ments over those limitations. This work proposes the use of phase modulation in the excitation signal and the application of the Pearson correlation to the instantaneous phase image. Simulations and experimental tests in an aluminum plate with artificial defects using Lamb waves and a linear piezo-electric array were conducted. The frequency response of the transducers-plate system was considered, leading to images with reduced artifacts and dead zone, and improvement in lateral resolution when compared to amplitude and instantaneous phase images without modulation. Department of Electrical Engineering UNESP (Univ. Estadual Paulista) Department of Electrical Engineering UTFPR (Univ. Tecnonógica Federal do Paraná) Department of Electrical Engineering UNESP (Univ. Estadual Paulista) CAPES: 001 |
| Databáze: | OpenAIRE |
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