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Laterally Focused Arrays-Improved Defect Length Sizing


Automatic Fastener Hole inspection in Aircraft Overview

Improvements in probe manufacturing technology have led to improved defect length sizing. Phased Array CCEV [Concave Curvature in Elevation (axis)] probes have been created to improve accuracy in defect length sizing. Two primary applications, small diameter piping and onshore/offshore pipeline construction have been the primary applications where this technology has been exploited but many phased array users are applying them in other applications. This technology has led to improve difficult small diameter thin wall inspections as well as critical pipeline inspections.

CCEV Phased Array Probes Construction

Phased Array probes can be electronically focused in the forward or active axis by controlling the pulse and reception of the elements. Without complex array construction (dual/matrix array etc.) the passive axis has long been left to natural beam spread created by aperture and element dimensions and frequency of the probe. CCEV probes were created by applying a curvature in the elevation or side to side or passive axis dimension of a phased array probe. The appropriate curvature was established by laboratory trials and simulated beam simulations for the typical diameters and wall thickness for both pipeline construction welds and small diameter pipe and tube welds. Similar to applying a lens to an immersion probe the effect is a smaller beam spot width, which can lessen beam spread effects and allow better length sizing potential. Although primarily applied to the PipeWIZARD and COBRA scanning systems, the technology can be applied to almost any linear array probe design to fit other applications. An internal integrated lens allows the use of standard flat wedges and flat outside casing.

linear
internal focus
flat
curved

Illustration of flat and internally focused arrays with corresponding beam plot. Note significantly reduced beam width.

Results from PipeWizard System on 3mm wide reflector with normal 1D linear Flat Array and CCEV Curved Probe.
Results from PipeWizard System on 3mm wide reflector with normal 1D linear Flat Array and CCEV Curved Probe.
Results from PipeWizard System on 3mm wide reflector with normal 1D linear Flat Array and CCEV Curved Probe.
Results from PipeWizard System on 3mm wide reflector with normal 1D linear Flat Array and CCEV Curved Probe.

Results from PipeWIZARD System on 3mm wide reflector with normal 1D linear Flat Array and CCEV Curved Probe.

Results of inspection on 2.75” (70mm) dia. Pipe with induced 6.9mm x .5mm OD notch. Note signifigant sharpness of data and improved sizing using CCEV probe. Data taken utilizing Cobra Scanner. Sizing done via – 6dB drop method.
Results of inspection on 2.75” (70mm) dia. Pipe with induced 6.9mm x .5mm OD notch. Note signifigant sharpness of data and improved sizing using CCEV probe. Data taken utilizing COBRA Scanner. Sizing done via – 6dB drop method.

Cobra Semi-Automatic Scanner for Small Diameter Pipe and Tube and PipeWizard Automated System for Pipeline Construction. CCEV probes have been optimized for use in these two systems.
Cobra Semi-Automatic Scanner for Small Diameter Pipe and Tube and PipeWizard Automated System for Pipeline Construction. CCEV probes have been optimized for use in these two systems.

COBRA Semi-Automatic Scanner for Small Diameter Pipe and Tube and PipeWIZARD Automated System for Pipeline Construction. CCEV probes have been optimized for use in these two systems.

Conclusion

Laterally focused arrays have been created significantly improving length sizing potential in small diameter piping and pipeline construction systems. This technology can be applied to most 1D linear array probes, offering potential to improve sizing in many often performed phased array examinations. Standard CCEV arrays are listed in our phased array probe catalog.

Please contact SCE.PM@olympusndt.com or submit details via our online custom probe form to ask about custom CCEV probe possibilities for your applications.

Olympus IMS

Products used for this application


OmniScan SX

The single group, lightweight OmniScan SX features an easy-to-read 8.4 inch (21.3 cm) touch screen and provides cost-effective solutions. The OmniScan SX comes in two models: the SX PA and SX UT. The SX PA is a 16:64PR unit, which, like the UT-only SX UT, is equipped with a conventional UT channel for P/E, P-C or TOFD inspections.

OmniScan MX2

The OmniScan MX2 now features a new phased array module (PA2) with a UT channel, and a new two-channel conventional ultrasound module (UT2) that can be used for TOFD (Time-of-Flight Diffraction), as well as new software programs that expand the capabilities of the successful OmniScan MX2 platform.

Phased Array Probes

Phased array application-specific probes have a range from 0.5 MHz to 18 MHz and may come with 16, 32, 64, or 128 elements. Special probes may have up to hundreds of elements.

PipeWIZARD

The PipeWIZARD is an automated girth weld inspection system using phased array and conventional UT techniques (AUT). Specially designed for in-site weld-to-weld inspection in extreme environments, on-shore and off-shore.

COBRA Scanner

The COBRA manual scanner combined with OmniScan MX flaw detector and a 16:128 module is used to perform circumferential weld inspection on small-diameter pipes. The COBRA can hold two PA probes to inspect pipes with OD ranging from 0.84 to 4.5 in.
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