Group Sponsored Project PHASED ARRAY TECHNOLOGY A PRACTICAL EVALUATION OF THE BENEFITS Ultrasonic inspection plays an important role in assuring the quality and integrity of engineering components. However almost all industrial inspections are based on probes which produce fixed ultrasonic beams. This contrasts with the situation in medical applications where special phased array probes are routinely used to produce beams which sweep through the inspection volume, allowing highly detailed real-time images to be produced. Previous use of phased array techniques and equipment in other sectors has tended to be restricted to laboratory or highly specialised applications. However recent developments mean that they are now available for wider industrial use and may represent the biggest advance in industrial ultrasonics since the time of flight diffraction (TOFD) technique. Potential advantages include: Improved defect detection, More accurate defect sizing, Easier to interpret ultrasonic signals (displaid in an image format), Faster inspections (reduction in inspection time). Industrial interest in phased array techniques is rapidly increasing. However, as with any new technology it is important that capability is properly determined and both advantages and limitations identified. We have therefore launched a Group Sponsored Project on A Practical Evaluation of Phased Array Techniques. It is intended to increase understanding within the sponsoring organisations of phased array technology, and allow them to make informed decisions on the acceptability and potential benefits for their own applications. I hope this is of interest to you. If you wish to receive more information, if you wish to participate, or if you have any queries, please do not hesitate to contact me. Yours sincerely, Xavier GROS Senior Project Engineer NDT Development and Services firstname.lastname@example.org
09:34 Jun-11-2001 Jeffery R & D, Ultrasonic Phased Array, Physical Science, NAS-410 LIII NASA, USA, Joined Dec 1999 37
Re: Ultrasonic PHASED ARRAY Technology Xavier -
I am happy to hear of the growing interest in the Phased Array technology.
I work for NASA, at the Marshall Space Flight Center. We have a R/D Tech Tomoview system with one transducer: 64 element array, 10Mhz.
We are developing the inspection techniques for use on Friction-Stir welds of the External Tank. This will eventually be used in production -- probably a crawler type bridge, with dual 64 element, or maybe dual 128 element, transducers. Vertical inspection.
There seemed to be a large initial learning curve for Phased Array inspection, but we now are very confident in this method. We are detection LOP @ 0.020" and above, with detection of LOF as well.
Sensitivity, detection, mapping - all seem to surpass any other NDT method we have currently. RT, PT, ET, nothing comes close to the data the Phased Array unit gives.
I would like to keep informed of others who are using this method. As you mentioned, presently, we are in a "lab" environment, but soon will move to the production floor on full scale External Tanks.
In the lab, we have plates of 0.320" & 0.650", but now are able to inspect tapered plates of 0.650-0.320 just fine.
Thanks for the post.
Jeffery L. Leak - ED32 National Aeronautics and Space Administration George C. Marshall Space Flight Center MSFC, AL. 35812
: Group Sponsored Project : PHASED ARRAY TECHNOLOGY : A PRACTICAL EVALUATION OF THE BENEFITS
: I hope this is of interest to you. If you wish to receive more information, if you wish to participate, or if you have any queries, please do not hesitate to contact me. : Yours sincerely, : Xavier GROS : Senior Project Engineer : NDT Development and Services : email@example.com .