Phased array probes are a recently developed technology that offers significant advantages in the detection, sizing and imaging of defects that can affect the structural components of airplanes, bridges, power plants and other critical areas. A new ASTM International standard describes testing that can be done on various arrays to ensure that all inspectors are using similar testing equipment.

E2904, Practice for Characterization and Verification of Phased Array Probes, was developed by Subcommittee E07.06 on Ultrasonic Method, part of ASTM International Committee E07 on Nondestructive Testing.

"E2904 should allow different inspectors to analyze defects independently and come to essentially the same conclusions on their severity," says Michael Moles, senior technology manager, Olympus NDT, and an E07 member. New standardized arrays, along with automated scanning, will facilitate repeatable test results, according to Moles, who also notes, "Phased arrays are significantly faster, as well as providing permanent records and better imaging."

Arrays defined in E2904 can be used by inspectors on all manner of components that impact the public. In addition to inspectors, the standard can be used by regulators, manufacturers, laboratories, quality assurance departments and purchasing agents. Measurement data obtained from the standard can be used to specify, describe, or provide performance criteria for procurement and quality assurance or service evaluation of the operationg characteristics of linear phased-array ultrasonic probes. All or portions of the standard can be used, as needed.

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CONTACT Technical Information: Michael Moles, Olympus NDT • Waltham, Mass • Phone: 416-831-4428 | ASTM Staff: Kathleen McClung • Phone: 610-832-9717 | Upcoming Meeting: June 2-6 • ASTM Headquarters, West Conshohocken, Pa.