Evaluation of ultrasonic phased array system with aluminum specimens

This paper evaluates the capabilities of M2M MultiX LF system with a linear phased array probe. Tests were carried out on aluminum specimen with various depths, sizes and types of defects and the results are presented here. Ultrasonic phased array is a relatively new technology that has only recentl...

Full description

Saved in:
Bibliographic Details
Main Author: Seet, Qi Yao.
Other Authors: School of Mechanical and Aerospace Engineering
Format: Final Year Project
Language:English
Published: 2009
Subjects:
Online Access:http://hdl.handle.net/10356/16205
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-16205
record_format dspace
spelling sg-ntu-dr.10356-162052023-03-04T19:15:48Z Evaluation of ultrasonic phased array system with aluminum specimens Seet, Qi Yao. School of Mechanical and Aerospace Engineering Wong, Brian Stephen DRNTU::Engineering::Mechanical engineering::Mechatronics This paper evaluates the capabilities of M2M MultiX LF system with a linear phased array probe. Tests were carried out on aluminum specimen with various depths, sizes and types of defects and the results are presented here. Ultrasonic phased array is a relatively new technology that has only recently seen an increased usage in many industries, including the aerospace field where it is being used for nondestructive testing of aircraft components. A phased array probe contains many small elements, each of which can be individually pulsed. By apply time delays to the pulsing of the elements, the resultant beam can be steered and focus as desired. The phased array system is found to be able to present more results at one single time. It is able to display the A-scan and B-scan from each of the 16 elements. This speeds up greatly the testing process, as compared to a conventional single-element probe. The dimensions of the test specimens can be profiled by taking advantage of this capability. Depth and size of flat-bottomed holes can be accurately measured with the phased array probe. The C-scans in particular can show the depth and size differences in one image. The depth and size of side-drilled holes are a bigger challenge. There are discrepancies in the results due to the more complex geometry. Empirical equations have been developed though that can calculate the depth and size accurately. Phased array can also detect fine cracks on the surface and under the surface. The capability to do S-scan offer better data interpretation than the conventional displays. It can scan across a larger area and can detect defects that are oriented in a position that is hard to detect. Fabricated test specimen shows that the S-scan is only useful up to an angle of ±50°. The changes in beam profile with the number of active elements are also plotted in 3-D diagrams. It is proven that there is an optimum number of active elements in a probe that can minimize error in defect sizing. The 2 dB amplitude drop technique is the best for sizing of flat-bottomed holes. Studies into the energy profile also revealed some non-ideal behavior that has to be taken note of in future work on the probe. Bachelor of Engineering (Aerospace Engineering) 2009-05-22T06:52:40Z 2009-05-22T06:52:40Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/16205 en Nanyang Technological University 132 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Mechatronics
spellingShingle DRNTU::Engineering::Mechanical engineering::Mechatronics
Seet, Qi Yao.
Evaluation of ultrasonic phased array system with aluminum specimens
description This paper evaluates the capabilities of M2M MultiX LF system with a linear phased array probe. Tests were carried out on aluminum specimen with various depths, sizes and types of defects and the results are presented here. Ultrasonic phased array is a relatively new technology that has only recently seen an increased usage in many industries, including the aerospace field where it is being used for nondestructive testing of aircraft components. A phased array probe contains many small elements, each of which can be individually pulsed. By apply time delays to the pulsing of the elements, the resultant beam can be steered and focus as desired. The phased array system is found to be able to present more results at one single time. It is able to display the A-scan and B-scan from each of the 16 elements. This speeds up greatly the testing process, as compared to a conventional single-element probe. The dimensions of the test specimens can be profiled by taking advantage of this capability. Depth and size of flat-bottomed holes can be accurately measured with the phased array probe. The C-scans in particular can show the depth and size differences in one image. The depth and size of side-drilled holes are a bigger challenge. There are discrepancies in the results due to the more complex geometry. Empirical equations have been developed though that can calculate the depth and size accurately. Phased array can also detect fine cracks on the surface and under the surface. The capability to do S-scan offer better data interpretation than the conventional displays. It can scan across a larger area and can detect defects that are oriented in a position that is hard to detect. Fabricated test specimen shows that the S-scan is only useful up to an angle of ±50°. The changes in beam profile with the number of active elements are also plotted in 3-D diagrams. It is proven that there is an optimum number of active elements in a probe that can minimize error in defect sizing. The 2 dB amplitude drop technique is the best for sizing of flat-bottomed holes. Studies into the energy profile also revealed some non-ideal behavior that has to be taken note of in future work on the probe.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Seet, Qi Yao.
format Final Year Project
author Seet, Qi Yao.
author_sort Seet, Qi Yao.
title Evaluation of ultrasonic phased array system with aluminum specimens
title_short Evaluation of ultrasonic phased array system with aluminum specimens
title_full Evaluation of ultrasonic phased array system with aluminum specimens
title_fullStr Evaluation of ultrasonic phased array system with aluminum specimens
title_full_unstemmed Evaluation of ultrasonic phased array system with aluminum specimens
title_sort evaluation of ultrasonic phased array system with aluminum specimens
publishDate 2009
url http://hdl.handle.net/10356/16205
_version_ 1759856847137800192