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OmniScan MX: Basic Aerospace
Eddy Current Array Setup

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Hello, my name is Ghislain Morais

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and I am the product leader
of the eddy current

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and bond testing division
at Olympus NDT.

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Today, we will demonstrate
how easy it is

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to perform a basic aerospace
Eddy current array setup

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in order to obtain a C-scan image.

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We will use an OmniScan MX,

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an Eddy current array module

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and a compact flash card with
the new 3.0R2 software.

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For this demo we will also use
an SBBR026-ENC array probe

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and the TB-S1calibration standard.

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Press the start button

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and wait for the instrument
to boot up.

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Once the instrument boots up,

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select the MXE 3.0R2 software
and wait for it to load.

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Insert the probe connector
into the module

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and tighten both screws.

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The probe is detected automatically
and a message appears.

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Press OK to accept.

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Plug in the encoder connector
and tighten both screws.

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With the new 3.0R2 software

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the screen layout has been improved.

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Select the “settings (main)" button

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to get a full-screen view of
the default CSI screen.

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The screen layout now includes
a strip chart view

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as well as an impedance plane

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with the horizontal
& vertical dot positions

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set by default at 80 % and 20 %.

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The C-scan’s default color palette
is “spectrum PAL”.

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We will now start a basic eddy current
array setup of the OmniScan.

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First, we need to configure
the lift-off

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and the defect signal
for the impedance plane.

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To begin, select the
blue “menu” button,

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then select “display”,

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then select “acquisition”

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and then select “strip chart
and impedance plane.”

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To activate full SI mode

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we have to set the scan
to time-based inspection.

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To do this,
select the blue “menu” button,

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select “scan,”

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select "inspection,’’

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and “scan” again,

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and then select "time."

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Now we will need to set the frequency.

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Select "menu,"

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then “EC settings,"

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“settings (MAIN)”

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and then set the required
frequency and gain.

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As with conventional
eddy current setups,

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we will set the lift-off signal
to 0 degrees

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on the impedance plane.

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To do this you need to
make sure the probe

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is firmly applied to
the calibration standard

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and then press the balance button.

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Raise and lower the probe
on and off of the standard,

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and rotate the knob at the same time

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to adjust the phase angle (rotation).

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Press OK to accept,

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making sure the beginning
of the signal

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is very close to 0 degrees.

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We will now set the defect signal
of the standard

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to around 80% on the vertical axis
on the impedance plane.

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First we will scan the defect

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and adjust the horizontal
and vertical gain

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to get an 80% vertical signal.

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The configuration of
the lift-off and defect signal

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on the impedance plane is now finished

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At this point, we can go back
to the original CSI mode.

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Select “menu”

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select “display”

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“acquisition”

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and “CSI”, and then
press OK to accept.

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With the instrument in CSI mode,

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we will now activate the encoder.

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Select “menu”

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select “scan,"
select “scan” again,

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and then “encoder one”.

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To activate the continuous mode,
select “continuous.”

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Select “area”

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Select “scan end”

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and then enter the probe size value

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and press OK to accept.

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Select “menu”

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select “EC settings”

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and then “settings” (MAIN).

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Now we are ready to scan the defect,

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and assess the resulting image.

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Press the balance button
and scan the standard.

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Some final gain adjustment
may be required.

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If necessary, add up to 6 db
and rescan

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until you have achieved
the ideal color and the contrast.

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There are 2 ways that
you can save data.

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If you press save,
the data and screen shot

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will be automatically saved
to the compact flash card.

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The 2nd method is to create a file

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which can also be saved to the card.

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If you want to name the file
you can select “menu”

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select “file”

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select “save”

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“save set up as”

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“file name”

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and then use the keys to type a name
and then press “save."

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The OmniScan MX has an analysis tool

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that you can easily access by pressing

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the freeze mode button
and the cursor button.

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In freeze mode,
you can use the ''scan start,''

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''index start''

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''length selection'' and
''angle selection'' cursors

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to reproduce a particular signal

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on the impedance plane
and strip chart.

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You can also position the cursors

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to evaluate the size of a defect.

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The palette color can also be
changed while in freeze mode.

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Just select “menu,” select “display,”

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select “color,”

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select “load palette,”

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and then choose a color on the menu

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and press OK to accept.

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You can also build a report

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by selecting “menu,” “file,” "report,"

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and then “build.”

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You have just seen how easy it now is

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to create an Eddy Current Array set-up

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using the Omniscan MX

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This concludes the basic aerospace
Eddy Current Array set-up.

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For the latest updates
in Eddy current array,

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bond testing, and other
innovative Olympus solutions

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please contact your
local representative

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