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Olympus dual matrix array probes

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extend the inspection range of the
OmniScan and Focus instruments

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for coarse grained
austenitic stainless steels

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and inconel alloy materials and welds.

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The dual matrix array or
“DMA” probes

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improve flaw detection and sizing

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of difficult to penetrate materials

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by combining the benefits of
phased array S-scans

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and low frequency transmit-receive

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or TRL inspection strategy

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DMA probes are purchased
in either a dual configuration

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for single sided inspection

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or quad configuration for
two sided simultaneous inspection

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with all arrays wired
into the same connector

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eliminating the need for a splitter.

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The Olympus 2.25MHz A17 DMA probe

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contains a 4X7 large element
configuration in each housing

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optimized for thicker and more
attenuative austenitic materials.

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In this example,

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programming a 30-80 degree
longitudinal wave S-scan

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provides full volumetric inspection
of the austenitic weld

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in one pass using the
Olympus VersaMouse scanner.

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The 4MHz A27 DMA probe

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uses a 2X16 element
configuration in each housing

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and is optimized for thinner materials
using smaller elements

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for improved beam steering
and surface inspections.

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In this example,

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using a wedge optimized for
surface and near surface detection,

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a 70-85 degree longitudinal wave
S-scan

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is focused at 20mm
in front of the wedge face

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where shear wave pulse echo
full V skipping is not possible

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for shallow and surface
connected flaw detection.

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For high angle surface testing

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the OmniScan display is configured
for an uncorrected S-scan

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to optimize the display size

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and the gate is positioned to
represent the width

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of the inspection area over
the weld in the C-scan

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for detection of surface
and near surface flaws.

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The DMA wedges are available

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in either flat or AOD configuration

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contoured for the pipe diameter.

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Acoustically insulating the
transmitter and receiver in the wedge

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eliminates the need for
wedge dampening material

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and a large standoff that is required

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in longitudinal pulse echo wedges.

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resulting in more energy and less
noise in the inspection data.

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DMA probe wedges are removable,

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come with scanner
and irrigation ports,

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and are designed for either volumetric

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or shallow surface inspection

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similar to conventional UT
TRL creeping wave probes.

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The 32:128PR module

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supports up two DMA probes

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for two sided simultaneous
phased array inspection.

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Instrumentation to drive DMA probes

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requires the ability to
transmit and receive

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using different elements or apertures

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available in the OmniScan
and Focus instruments

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with the pulser-receiver
or “PR” option.

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upgrade pricing is available for
standard

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or previous generation
OmniScan modules.

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Improvements in latest generation
PA2 OmniScan modules

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includes expanded
operating temperatures,

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fanless design,

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115V pulser,

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video filtering,

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, and significantly improved
signal to noise ratio,

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required for austenitic inspections.

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Standard OmniScan software
supports DMA probes

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and requires a law file import

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from either the Olympus Setup Builder,

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Tomoview calculator,

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or library of pre-defined law
files for S-scan configuration

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to include angular range and focus.

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UT optimization and
calibration functions

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are performed using austenitic
reference standards or pipe samples

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The attenuation of the material
and size of weld bevel

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will determine the number of
line scans or focus strategies

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required to meet the needs
of the inspection.

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Detection and sizing accuracy limits

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for any material or weld bevel
is dependent on many factors

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including the probe frequency
capable of detection

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and can only be determined
through trial and error

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on weld samples or reference
blocks of the same material.

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DMA probes are only recommended

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for materials and weld bevels

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where shear wave pulse echo
inspection is not possible.

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For manual encoded inspection

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a chain scanner using
a single DMA probe

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performs line scans on an
inconel CRA weld for detection.

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After a flaw is detected,

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use of the index raster arm
allows the probe

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to be repositioned
for sizing optimization.

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A two axis mechanized scanner

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provides full automated
inspection of CRA welds

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to include one line scans
for detection

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and raster scanning for improved
flaw sizing and characterization.

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OmniPC allows Omniscan data
to be analyzed on a computer

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with the same software interface
as the instrument.

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In this example, a 2Mhz A17 DMA probe

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detects ID connected
thermal fatigue cracking

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in the heat affected zone of an
inconel weld and base material.

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the crack is length sized
on the C-scan

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and depth and height sized on
the A-scan, B-scan, and S-scans.

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Use of Tomoview for
analysis or acquisition

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provides custom display configuration,

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more C-scan functionality,

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and the abilitiy to merge
multiple groups

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and\or multiple data files together
for simultaneous analysis.

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More than software features
or instrument specifications,

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improvements in austenitic
weld inspection will be realized

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by probe technology
and wedge strategies.

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Olympus matrix arrays are
one more application

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that expands the range of
what is possible with an OmniScan

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and allows rapid development
and qualification

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at the inspector level using
standard catalog products.

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For more information on
Olympus Dual Matrix Array Probes

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and austenitic weld inspection

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contact your local
representative

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or visit us online at
www.olympus-ims.com