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EPOCH 1000 Series Procedure Phased Array Angle Beam Calibration

EPOCH 1000 Series Procedure Phased Array Angle Beam Calibration. Required Items. Test Block TB7541-1 (IIW block) Guide block Couplant D-12. Transducer and Wedge 5L16-A10P-P-2.5-OM probe SA10P-N55S wedge. Probe and Focal Law Setup.

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EPOCH 1000 Series Procedure Phased Array Angle Beam Calibration

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  1. EPOCH 1000 Series ProcedurePhased Array Angle Beam Calibration

  2. Required Items • Test Block • TB7541-1 (IIW block) • Guide block • Couplant • D-12 • Transducer and Wedge • 5L16-A10P-P-2.5-OM probe • SA10P-N55S wedge

  3. Probe and Focal Law Setup • Beam setup menu opens automatically when probe is connected • Automatic Probe Recognition makes probe setup easy! • All probe setups are done from one screen • Default settings for material and focal laws automatically generated for ease of generic setup

  4. Probe and Focal Law Setup • Plug in Probe • Probe ID automatically recognized • Select Wedge ID from available list • SA10P-N55S for this example • Verify desired focal law settings • Default is 40-70 sweep at 1 increments for this example • Press [ESC] when finished to return to live screen

  5. Initial Settings • Set up additional live parameters using Direct Access Keys and Knob • Set Range to 10 inches • Set Angle to 45 • Ready to begin calibration!

  6. Three Step Calibration • Velocity • Zero Offset (Wedge Delay) • Sensitivity (Gain) • Notes: • Sometimes helpful to do sensitivity prior to zero offset to ensure consistent amplitude response. • Zero Offset and Sensitivity Calibrations will calibrate all focal laws in one calibration step!

  7. Velocity Calibration • Determines the velocity of sound within the calibration block (should be similar to the test material) • Requires two reflectors of the same size at two different known soundpaths. (Same general principle as UT velocity calibration) • Velocity setting directly impacts the calculation of focal laws by the EPOCH 1000 – velocity calibration is critical to ensuring the selected focal law is correctly representing the displayed angle • Velocity calibration must be performed before the wedge delay calibration to ensure proper focal law calculation while determining zero offsets

  8. 1” 4” Velocity Calibration (cont.) • Set Calibration to CAL Velocity • Couple probe to block at “0” mark and face towards the block arc • Position Gate 1 around 4in signal • Peak up signal from 4 inches • Peak Memory can be used as an aid to finding the maximum signal peak • Bring the peaked 4 inch indication to 80% of full screen height • The AUTO-80% function can be used to achieve this gain adjustment quickly

  9. 1” 4” Velocity Calibration (cont.) • Turn Peak Memory OFF • Press the Depth 1 key • Use the knob to enter 4.000 as the known soundpath of the reflector • Press Check to Continue

  10. Velocity Calibration (cont.) • Position Gate 1 further in time to surround the 9 inch signal • Use the Auto-80% function to adjust this signal to 80% FSH • Press the Depth 2 button • Use the knob to enter the value 9.000 inches • Press Check to finish the calibration process and calculate the material velocity and focal laws NOTE:Do Not move the probe once the 4 inch signal has been peaked. The probe must remain in the same place on the block for the 9 inch signal.

  11. Zero Offset (Wedge Delay) Calibration • Corrects for delay between transducer firing and when sound enters test piece for all focal laws • Similar to Zero calibration in UT • Each focal law represents a different angle of inspection, and therefore has a different BIP. The length of wedge material that the sound travels through is different for each focal law. This requires that each focal law have a separate zero offset calculation. • Single calibration step to calculate wedge delay for ALL focal laws. • Can be performed with either reflector of known depth, or of known soundpath.

  12. Zero Offset Calibration (cont.) • Set Range to 2 inches • Set Calibration to CAL Zero • Set the CAL mode to Depth • Couple probe to block at SDH • Set Angle to 45 • Position Gate 1 around SDH signal • TIP: Gate start and width should be positioned so that the measurement from the SDH can be acquired for every focal law

  13. Zero Offset Calibration (cont.) • Use Peak Memory to peak up signal • Once signal has been peaked, turn OFF Peak Memory • Use the Auto-80% function to bring the gated signal to 80% FSH • Press Start to begin the calibration process • Enter 0.600 in the dialog box (depth of reflector) • Use the Right Arrow key to highlight the continue button • Press Continue to begin acquiring the wedge delay data

  14. Zero Offset Calibration (cont.) In place of the A-Scan, a line appears that represents the thickness measurement acquired from each focal law. When calibrated, this line should be a straight line showing that the thickness measurement for the given reflector is equal to the known depth of the reflector for each focal law.

  15. Zero Offset Calibration (cont.) To acquire wedge delay data for calibration: • Move the probe over the side drilled hole to acquire thickness data across all focal laws • TIP: For the most accurate curve: • Move the probe slowly • Use a guide to avoid skew • Make multiple passes over reflector • Press Done when curve is complete. • NOTE: The wedge delay indication must not leave the gated region or become saturated for any focal law • NOTE: Use the Erase button to delete the curve and start again

  16. Sensitivity (Gain) Calibration • Sensitivity (gain) calibration normalizes the amplitude response of a given reflector across all focal laws (angles). • Ensures that the amplitude of a given reflector appears at the same screen height regardless of the angle (focal law) used to inspect that reflector. • Can be performed with either reflector of known depth, or known soundpath.

  17. Sensitivity Calibration (cont.) • Set Range to 2 inches • Set Calibration to CAL GAIN • Couple probe to block over the SDH • Set Angle to 45 • Position Gate 1 around SDH signal • TIP: Gate start and width should be positioned so that the measurement from the SDH can be acquired for every focal law

  18. Sensitivity Calibration (cont.) • Peak up the SDH reflector and bring level to 80% of FSH • TIP: Use the Auto-80% function to automatically bring signal to 80% FSH • Use the ADD button to begin acquiring data for the sensitivity calibration

  19. Sensitivity Calibration (cont.) Move the probe over the SDH reflector to collect amplitude data across all focal laws • NOTE: The sensitivity reflector indication must not leave the gated region or become saturated for any focal law • Press Done when curve is complete. • NOTE: Use the Erase button to delete the curve and start again

  20. Calibration Complete! • Instrument will display 0CAL and TVG flags indicate that Zero and Gain calibrations have been performed and are being applied (Active). • Verify calibrated distances and sensitivity by switching between 45, 60 and 70 degree focal laws.

  21. Horiz. Dist. from Probe Front Probe Front Cursor Leg Indicator(based on part thickness) Image Overlays • For further detail and information from the calibrated image: • Show front of probe marker for easy surface distance interpretation • Displays vertical line corresponding to position of the front of the wedge • Show leg indicator on image. • Provides easy true depth marker of part thickness (first leg second leg) • Requires part thickness value to be correctly defined in the BEAM setup menu Image overlays activated from Display Setup>Image Overlay menu

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