epoch 1000 series procedure linear scan and c-scan

EPOCH 1000 Series ProcedureLinear Scan and C-scan

Presentation Contents Feature Overview

Beam Setup and Calibration: 0 Degree Linear Scan

Demonstration Procedure: 0 Degree Linear Scan

Beam Setup and Calibration: Angle Linear Scan

Demonstration Procedure: Angle Linear Scan

Beam Setup and Calibration: 0 Degree C-scan

Demonstration Procedure: 0 Degree C-scan

C-scan Setup: A-scan Storage and View

Feature Overview

Linear Scan and the EPOCH 1000i Linear Scanning is available as an option on the EPOCH 1000i instrument

– Ordering Information: EP1000I-ECSCAN (U8140141)

Linear Scans utilize a group of elements in a phased array probe to acquire multiple A-scans from the area under the probe

– The number of elements in a group is less than the total number of elements of the probe

– The A-scans are usually captured in sequence to provide an image of the area under the probe at one fixed angle

A common example is using a 64 element probe to pulse groups of 16 elements at a time

– 16 elements is known as the aperture of the scan

– Image is created by firing elements 1-16, then 2-17, then 3-18, etc

NOTE: For full linear scan theory, see the Linear Scan overview at http://www.olympus-ims.com/en/ndt-tutorials/instrumententation/sscan/

http://www.olympus-ims.com/en/ndt-tutorials/instrumententation/sscan/

Linear Scan and C-scan Linear scanning allows the user to create a fixed-angle image the same size as

the probe width in one dimension

This is called an electronic scan because the pulsing sequence can create an image without physically moving the transducer

By moving the transducer perpendicular to the electronic scan acquisition, the EPOCH 1000i allows the user to create a C-scan image

– Combines mechanical scan and electronic scan

The EPOCH 1000i only offers manual C-scan, not encoded

Probe Compatibility The EPOCH 1000i is compatible with probes with up

to 64 elements

This 64 element compatibility is available on every EPOCH 1000i shipped in the past or future

The 64 element probe marketed with the EPOCH 1000i is the A12 style weld probe series transducer: 5L64-38.4X10-A12-P-2.5-OM (U8330593)

Other 64 element probes may be used after the wedge information is manually entered using the wedge/probe EDIT tool

Linear Scan and C-scan Sales Strategy Even with linear scan and/or C-scan capabilities, the EPOCH 1000i is still a

manual inspection instrument

Manual C-scans help provide information about a wide area of the test piece quickly through imaging, but still requires the user to manually prove up a potential defect

Target markets are:– Corrosion mapping– Delaminations in composites, plastics and other materials (aerospace)– Bond/Disbond applications– Weld inspection (fixed angle Linear scan at 45, 60 or 70)– Crack Detection (fixed angle Linear scan at 45, 60 or 70)

Beam Setup and Calibration:0 Degree Linear Scan

Required Equipment

Test Block– EP1000-PABLOCK-1 Phase Array

Aluminum Demo Block Couplant

– D-12 Gel Type couplant

Transducer and Wedge– 5L64-38.4X10-A12-P-2.5-OM

64 element PA probe

– SA12-0L wedge

Beam Setup Tool After attaching the 5L64-A12 probe, the Beam Setup menu should automatically

open– In the row Scan Type, select Linear Scan– Select the SA12-0L wedge from the wedge ID list– Adjust other parameters as below

Linear Scan Calibration

The calibration method for linear scans is nearly identical to standard calibrations.

Calibrate Velocity Calibrate Wedge Delay Calibrate Sensitivity

To initially set up the instrument for calibration:

Place the PA Demo Block on its side (flat bottom holes facing down)

Set RANGE to 2.000” Set GAIN to ~8.0 dB Set INDEX to 28

Velocity CalibrationTo calibrate for velocity:

Position the probe facing through a clean 1.000” thickness of the PA Demo Block

Set the Gate1 start and width to capture the first backwall indication

Under the PA Cal group, select the CAL Velocity Calibration mode

Press [P1] (Depth 1) to enter the first known thickness (1.000”) and press [Check] (Continue)

Position Gate 1 to read the second backwall indication

Press [P2] (Depth 2) to enter the second known thickness (2.000”) and press [Check] (Continue)

Wedge Delay CalibrationTo calibrate for wedge delay:



Under the PA Cal group, select the CAL Zero Calibration mode

Press [P1] (Start) to enter the known thickness (1.000”) and press [Check] (Continue)

All required thickness measurements are capturedfrom the single backwall indication (some movement of the probe may be required)

Press [P2] (Done) to accept the measurements and complete the calibration

Sensitivity CalibrationTo calibrate for sensitivity:



Under the PA Cal group, select the CAL GAIN Calibration mode

Press [P1] (Add) to begin the calibration process

All required amplitude measurements are capturedfrom the single backwall indication (some movement of the probe may be required)


Completed Calibration

Demonstration Procedure:0 Degree Linear Scan

Zero Degree Demonstration Setup Place the PA Demo Block on its side with the three flat bottom holes (FBH) facing down

Place the 64 element probe on top of the block in the middle of the block, spanning the 3” height of the block

Set RANGE to 1.000”

Slide the transducer over the FBHs

Each FBH will appear individually (in succession)– Smallest will be closest to backwall reflection and show a lower overall amplitude response

– Largest will be closest to midwall and show a larger amplitude response

Zero Degree FBH Reflections

Small FBH

Large FBH

Backwall Reflection

Backwall Drop Out

Zero Degree FBH Reflections (cont.)

Rotate the probe 90 degrees so that the length of the probe is in line with the longest length of the block

Position the probe over the three FBHs

All three holes can be seen on screen at the same time at varying depths and amplitudes

Linear Scan Sizing Cursors

Since a zero degree linear scan shows true depth of flaws, as well as providing an electronic scan of indexes that properly scale the imaged defects, phased array sizing cursors can be used to establish sizing of flaws that are visible on screen

Press the FREEZE key

Use the PA Cursors group menu to adjust X and Y cursor positions

– P1 and P4 toggle the X and Y cursors ON and OFF

– P2, P3, P5, and P6 adjust cursor positions

To find the HEIGHT of the FBH– Position the Y1 cursor to intersect the peak

amplitude of the FBH indication

– Position the Y2 cursor to intersect the peak amplitude of the backwall indication

– Use the Y2-Y1 digital measurement to establish the height of the FBH

Y1 Cursor Y2 Cursor

Linear Scan Sizing Cursors (cont.)

Since a zero degree linear scan shows true depth of flaws, as well as providing an electronic scan of indexes that properly scale the imaged defects, phased array sizing cursors can be used to establish sizing of flaws that are visible on screen

To find the WIDTH of the FBH– Position the X1 cursor to intersect the

yellow amplitude area to the left of the FBH indication (-6dB point of image)

– Position the X2 cursor to intersect the yellow amplitude area to the right of the backwall indication (-6dB point of image)

– Use the X2-X1 digital measurement to establish the width of the FBH

X1 Cursor X2 Cursor

Beam Setup and Calibration:Angle Linear Scan

Required Equipment

Test Block– TB7541-1 IIW Block

– EP1000-PABLOCK-1 Phase Array Aluminum Demo Block

Couplant– D-12 Gel Type couplant

Transducer and Wedge– 5L64-38.4X10-A12-P-2.5-OM 64 element

PA probe

– SA12-N55S wedge

Beam Setup Tool After attaching the 5L64-A12 probe, the Beam Setup menu should automatically

open– In the row Scan Type, select Linear Scan– Select the SA12-N55S wedge from the wedge ID list– Set the Angle to 45 degrees– Adjust other parameters as below

Linear Scan Calibration

The calibration method for linear scans is nearly identical to standard calibrations.



Set RANGE to 9.200” Set GAIN to ~14.0 dB Set INDEX to 20

Velocity CalibrationTo calibrate for velocity:

Position the probe facing the radius of the IIW block

Peak up the radius reflection at Index 20

Set the Gate1 start and width to capture the 4.000” radius indication

Under the PA Cal group, select the CAL Velocity Calibration mode

Press [P1] (Depth 1) to enter the first known soundpath (4.000”) and press [Check] (Continue)

Position Gate 1 to read the 9.000” backwall indication and increase gain as necessary

Press [P2] (Depth 2) to enter the second known soundpath (9.000”) and press [Check] (Continue)

Wedge Delay CalibrationTo calibrate for wedge delay:

Position the probe facing the radius of the IIW block

Set the Gate1 start and width to capture the 4.000” radius indication

Under the PA Cal group, select the CAL Zero Calibration mode– Stay in Soundpath calibration mode

Press [P1] (Start) to enter the known soundpath (4.000”) and press [Check] (Continue)

Move the probe forward and backward to acquiremeasurements across all index points


Sensitivity CalibrationTo calibrate for sensitivity:

Position the probe facing the small side drilled hole of the IIW block

Set RANGE to 2.500” and INDEX to 0

Set the Gate1 start and width to capture the SDH reflection across all index points

Peak up the SDH signal at index 0

Under the PA Cal group, select the CAL GAIN Calibration mode

Press [P1] (Add) to begin the calibration process

Move the probe backward and forward to acquireamplitude measurements from the SDH


Completed Calibration

Demonstration Procedure:Angle Linear Scan

45 Degree Demonstration Setup Place the probe on top of the PA Demo Block on the opposite side from the cluster of

SDHs


Slide the probe across the top of the block

Each SDH will appear individually and move horizontally across the screen at varying depths

The cluster of SDHs will be visible at a depth of around 3.000”

45 Degree SDH Reflections

1 inch deep SDH

½ inch deep SDH

Cluster of SDHs

45 Degree Notch Reflections

Lay the PA Demo Block on its side with the FBHs facing down


In the PA Probe group, use the BEAM tool to set the THICKNESS to 1.000”

Orient the probe so that the length of the probe is in line with the longest length of the block, facing the notches

45 Degree Notch Reflections (cont.) Move the probe forward and backward along the length of the block to detect

the corner trap of each notch– The corner trap will occur along the first leg indicator on screen

Position the probe so the probe front is just over the edge of the block and the side of the probe is aligned with the long edge of the block containing the notches

– Two reflections appear» Corner trap of notch

» Corner trap of edge

Move the probe from the side of the block to the middle– The notch corner trap drops out– The edge corner trap remains

45 Degree Notch Reflections (cont.)

Probe Position 1

Probe Position 2

1 2

Beam Setup and Calibration:0 Degree C-scan

Required Equipment

Test Block– EP1000-PABLOCK-1 Phase Array

Aluminum Demo Block Couplant

– D-12 Gel Type couplant

Transducer and Wedge– 5L64-38.4X10-A12-P-2.5-OM

64 element PA probe

– SA12-0L wedge

Beam Setup Tool After setting up the Linear Scan settings in the Beam setup tool, the operator

can also create settings for an associated C-scan– In the row Scan Type, select C-Scan– Adjust other parameters as below– NOTE: A-scan setup is covered in a subsequent section

Zero Degree C-scan Calibration

The calibration method for Linear C-scans is nearly identical to standard calibrations



In the C-scan group, press [P1] (Screen) Select A/L Vert Follow the procedure to calibrate a zero degree linear scan

C-scan Interface Overview

The C-scan group has several controls to set up the information acquired during a Linear scan C-scan:

SCREEN: Single or combination view of Cscan, Linear Scan, Ascan, etc

MODE: Starts or Stops the Cscan acquisition

SOURCE (P3): Measurement source for Cscan (either Amplitude or Depth)*

NEW SCAN: Clears current scan and begins a new scan

BEST FIT: Stretches the image to fill the screen

SOURCE (P6): Measurement gate used to acquire Cscan image*

*All source data is acquired regardless of setting, allowing the user to review other source data after the scan is complete.

Demonstration Procedure:0 Degree C-scan

Zero Degree C-scan Demonstration Setup Place the PA Demo Block on its side with the three flat bottom holes (FBH) facing down

Place the 64 element probe on top of the block in the middle of the block, spanning the 3” height of the block


Turn Gate 2 ON

Set up the Gate start positions and widths as shown

Set SOURCE (P3) to Amplitude

Set SOURCE (P4) to Gate 1

Zero Degree FBH C-scan

Position the probe over the area with flat bottom holes (FBHs)

Press the [P2] (Mode) key and toggle to START

Slowly move the probe towards the edge of the block

After acquiring C-scan, use the [P2] (Mode) key to STOP the C-scan acquisition

Zero Degree FBH C-scan (cont.)

Live A-scan (even when Mode = STOP)

Amplitude C-scan of 3 FBHs

Linear Scan Axis (properly scaled)

Timed Scan Axis (NOT properly scaled)

Stored Source Data

After acquiring a C-scan, the user can adjust both SOURCE parameters to view other relevant C-scan data

Gate 1

Gate 2

Am

plitu

de Depth

C-scan Setup: A-scan Storage and View

A-scan Setup

Scan Direction: C-scan orientation

Save A-scan: Similar to A-scan storage for EPOCH XT B-scan– No Storage: No A-scan saved for reporting– Store on Alarm: Stores compressed A-scan whenever a Gate alarm is triggered

during C-scan acquisition– Store All: Stores all compressed A-scans during C-scan acquisition (limit TBD)

Active A-scan: Determines the mode of the live A-scan– Composite: Single A-scan view compositing all apertures into one view

» Index selection not available because all indexes are represented in live view

– Aperture: A-scan representing only the active aperture » User must select index in live screen

epoch 1000 series procedure linear scan and c-scan

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