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Ultrasonic Non-Destructive Testing using Sparse Synthetic Aperture / Nourhan Ahmed Mohamed Ali Ahmed ; Supervised Mohamed Nader Mohamed Abuelfotouh , Ahmed Mohamed Rashed Desoki

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Nourhan Ahmed Mohamed Ali Ahmed , 2022Description: 67 P . : charts ; 30cmOther title:
  • الاختبار اللا إتلافي بالموجات فوق الصوتيه باستخدام رقعه الاستشعار المركبه من مصفوفه شحيحه [Added title page title]
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Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Aerospace Engineering Summary: Phased-array ultrasound imaging is the most advanced non-destructive testing (NDT) method. There are three types of such imaging ; the plane scan method (PSM), the sector scan method (SSM) and the focused scan method (FSM). The FSM has the best resolution. However, the FSM requires huge number of measurements to construct an image. This requires complex multi-channel data acquisition (DAQ) hardware and long computation time. This makes FSM unsuitable for real-time imaging. The total focusing method (TFM) is an improved implementation of the FSM. The TFM reduces the DAQ HW complexity and reduces both the measurement and computation times. TFM enabled the recent emergence of portable NDT HW for real-time ultrasonic imaging. This research analyzes the reasons why the FSM is superior. Then, theTFMis analyzed to explain how it could implement the FSM . The sparse array synthetic aperture method (SASAM) is proposed as an implementation of the FSM. The SASAM reduces the number of transmitters/receivers along with their expensive multi-channel (DAQ) hardware, without evident loss in the image quality. Accordingly, this reduces the computation time as well. This makes the SASAM a faster and much cheaper alternative to the TFM that is much suitable for real-time imaging
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Item type Current library Home library Call number Copy number Status Date due Barcode
Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.13.01.M.Sc.2022.No.U (Browse shelf(Opens below)) Not for loan 01010110085644000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.13.01.M.Sc.2022.No.U (Browse shelf(Opens below)) 85644.CD Not for loan 01020110085644000

Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Aerospace Engineering

Phased-array ultrasound imaging is the most advanced non-destructive testing (NDT) method. There are three types of such imaging ; the plane scan method (PSM), the sector scan method (SSM) and the focused scan method (FSM). The FSM has the best resolution. However, the FSM requires huge number of measurements to construct an image. This requires complex multi-channel data acquisition (DAQ) hardware and long computation time. This makes FSM unsuitable for real-time imaging. The total focusing method (TFM) is an improved implementation of the FSM. The TFM reduces the DAQ HW complexity and reduces both the measurement and computation times. TFM enabled the recent emergence of portable NDT HW for real-time ultrasonic imaging. This research analyzes the reasons why the FSM is superior. Then, theTFMis analyzed to explain how it could implement the FSM . The sparse array synthetic aperture method (SASAM) is proposed as an implementation of the FSM. The SASAM reduces the number of transmitters/receivers along with their expensive multi-channel (DAQ) hardware, without evident loss in the image quality. Accordingly, this reduces the computation time as well. This makes the SASAM a faster and much cheaper alternative to the TFM that is much suitable for real-time imaging

Issued also as CD

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