Grating-lobe suppression through angular weighting for laser induced phased arrays

Lukacs, Peter and Pieris, Don and Davis, Geo and Wilcox, Paul D. and Stratoudaki, Theodosia; (2023) Grating-lobe suppression through angular weighting for laser induced phased arrays. In: 2023 IEEE International Ultrasonics Symposium (IUS). IEEE, Piscataway, N.J.. ISBN 9798350346459 (https://doi.org/10.1109/IUS51837.2023.10307497)

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Abstract

Laser Induced Phased Arrays (LIPAs) use lasers to generate and detect ultrasound, synthesizing the array in post processing. Data acquisition is done remotely, without couplant, addressing NDE challenges of inspection on complex structures and under extreme environments. Previously high-resolution ultrasonic imaging of components using LIPAs have been demonstrated by capturing the Full Matrix and employing the Total Focusing Method (TFM) as imaging algorithm. However, the Full Matrix Capture data acquisition method requires long acquisition time due to the mechanical scanning of lasers, compromising the application potential of LIPAs. It is possible to increase the data acquisition speed by reducing the number of array elements. Nevertheless, this can lead to the generation of grating lobes (GL), when the Nyquist sampling limit is exceeded for the interelement spacing of the array. In transducer phased arrays, GL can be suppressed by applying an angular limit in the TFM algorithm. This implementation is ideal for omnidirectional directivity centered around the surface normal, which is not the case for LIPA elements. In this work we are using an adaptive angular weighting factor that is suitable for LIPAs considering LU characteristics.

  • Item type:Book Section
    ID code:88476
    Dates:
    Date
    Event
    7 November 2023
    Published
    Notes:© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Science > Physics
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:18 Mar 2024 14:58
    Last modified:26 Apr 2024 00:11
    URI:https://strathprints.strath.ac.uk/id/eprint/88476
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