OmniScan MX2 Training Program - xdocs.net

OmniScan MX2 Training ProgramOmniScan MX2 Training Program

Introduction to Phased Array Using the OmniScan MX2Introduction to Phased Array Using the OmniScan MX2

Part 3Part 3

Please send questions and comments to:Please send questions and comments to: PhasedArrayPhasedArraySupport@[email protected]

IntroduIntroduction tction to Phased Array Uo Phased Array Using the Omnsing the OmniScan MX2 Part 3 -iScan MX2 Part 3 - OvervOverviewiew

Supporting documentation for the training program comes primarily from the MX2Supporting documentation for the training program comes primarily from the MX2

software manuals and the Olympus reference manuals below.software manuals and the Olympus reference manuals below.

Modern phased array systems like the MX2 do not require an advanced knowledgeModern phased array systems like the MX2 do not require an advanced knowledgeof mathematics or acoustic theory and of mathematics or acoustic theory and the training program focuses on the training program focuses on practicalpracticalexplanations and real world application examples for the working inspector.explanations and real world application examples for the working inspector.

Supporting theory, mathematical formulas, and more advanced PA concepts can beSupporting theory, mathematical formulas, and more advanced PA concepts can befound in the books below available from the ONDT web site.found in the books below available from the ONDT web site.

These manuals can be downloaded atThese manuals can be downloaded at http://www.olympus-ims.comhttp://www.olympus-ims.com

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IntrodIntroduction tuction to Phased Array Uo Phased Array Using the Omnising the OmniScan MX2 Part 3 -Scan MX2 Part 3 - ReviewReview

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The velocities of the wedge and component material are two of many parametersThe velocities of the wedge and component material are two of many parametersthat must bthat must be known to the known to the part and groe part and group set up wup set up wizard priorizard prior to the formatito the formation of theon of thefocal laws.focal laws.

No velocity correction can be made without recreating the focal laws.No velocity correction can be made without recreating the focal laws.

Like conventional UT, velocity is directly related to beam angle. (Snell’s law)Like conventional UT, velocity is directly related to beam angle. (Snell’s law)When the velocity of the material or wedge is other than what was input into theWhen the velocity of the material or wedge is other than what was input into the

group set up wizard the result is that the beam angle is not what it is supposed togroup set up wizard the result is that the beam angle is not what it is supposed tobe and canbe and cannot be correctednot be corrected. . (The 70 degree b(The 70 degree beam is realeam is really 68 degreely 68 degrees)s)

A material velocity tolerance error of no more than 20m per second must beA material velocity tolerance error of no more than 20m per second must beentered into thentered into the calculae calculator to maintain a tor to maintain a refracted steerinrefracted steering angle wg angle within +\-ithin +\- 11degrees.degrees.

IntroduIntroduction tction to Phased Array Uo Phased Array Using the Omnsing the OmniScan MX2 Part 3 -iScan MX2 Part 3 - VelociVelocityty

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The velocity parameter can be set in the OmniScan MX2 softwareThe velocity parameter can be set in the OmniScan MX2 softwarein 2 places:in 2 places:

1.1. The part\wThe part\weld set up eld set up wizard by wizard by selecting selecting material wmaterial with a fixed ith a fixed velocityvelocityfrom the from the database. (Probe\Part>Part>Materialdatabase. (Probe\Part>Part>Material))

2.2. The UT>GThe UT>Generaeneral sub menl sub menu by enteru by entering a cusing a custom veltom velocitocity valuey value..

Modifying the velocity will remove any calibration that has beenModifying the velocity will remove any calibration that has beencompleted in the wizards because the focal laws must be rebuilt.completed in the wizards because the focal laws must be rebuilt.

Using the velocity calibration wizard will also automaticallyUsing the velocity calibration wizard will also automaticallypopulate the value.populate the value.

IntroduIntroduction tction to Phased Array Uo Phased Array Using the Omnsing the OmniScan MX2 Part 3 -iScan MX2 Part 3 - VelociVelocityty

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The preferred method for obtaining the velocity in the group set up wizardis to select the material from a fixed database using a default value.

When the material velocity is unknown, the MX2 has a velocity calibrationwizard that measures the velocity of a component based on two fixedreflectors at known positions. (Side drilled hole, radius or back wall)

Use of the velocity calibration wizard for shear wave inspection is onlybeneficial if a suitable calibration block made of the exact same materialhas been manufactured.

This a common practice in pipeline jobs but rarely available for typicalASME, API, AWS, and similar inspections.

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Introduction to Phased Array Using the OmniScan MX2 Part 3 - Velocity

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For one degree angle accuracy in carbon steel the velocity input to the group set upwizard (Calculator) must be within +\- 20 meters\second.

If measuring velocity on a calibration block, 1 degree angle accuracy is onlyachieved when the sound path measurement is +\- .1mm of the actual value

Only precision measurements to this tolerance made on a block of the exact samematerial will result in velocity accuracy better than a default value taken from the

MX2 database.


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The MX2 velocity calibration wizard has 3 options for measuring the velocityof a component that are compatible with both shear and longitudinal beams.

1. Radius. (Angle beam on sound path radius)

2. Depth (Angle beam on side drilled hole)

3. Thickness (0 degree on component back wall)

All three options require 2 reflectors at known positions.

All three options will achieve best results when used with one A-scanor focal law. Angle beam is not recommended due to angle error.

Prior to entering the velocity wizard, program at least one single focal

law appropriate for the calibration type or install a conventional UTprobe.


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Introduction to Phased Array Using the OmniScan MX2 Part 3 – Gate Mode

Gate mode is set in theGate\Alarms>Gate>Parameters>Mode submenu and determines the point in the gatethat is used for the readings and C-scandata.

There are 3 measure options for position C-

scan and thickness or time of flight relatedreadings: – A. First crossing\edge.

– B. First Peak Position.

– C. Maximum Peak Position.

There are 2 peak options for amplitude C-

scan and related readings: – D. First Peak Amplitude.

– E. Maximum Peak Amplitude.

The relative peak and measure mode will bedisplayed in the reading box whenapplicable.

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