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Coherent Adaptive Focusing Technology for the Inspection of Complex Geometry

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This presentation from ECNDT 2018 reviews the following topics:

Ultrasonic Phased Array Benefits
Coherent Adaptive Focusing (CAF)
Capabilities of CAF
Results
Conclusions

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Coherent Adaptive Focusing Technology for the Inspection of Complex Geometry

  1. 1. 1 Coherent Adaptive Focusing Technology for the Inspection of Complex Geometry Olympus Scientific Solutions Americas ECNDT 2018, Gothenburg, Sweden June 2018 Etienne Grondin
  2. 2. Introduction
  3. 3. Ultrasonic Phased Array (UTPA) Benefits UTPA technology benefits for composite laminate inspection: 1. Faster inspection - Scalability and parallel firing 2. High resolution 3. Improved coverage 4. Better repeatability - Flat and radius
  4. 4. Ultrasonic Phased Array Limitations 1. Predefined focal laws unable to adapt to geometry variations - Poor uniformity radius - Weighted radius Uniform Radius Poor Uniformity Radius Weighted Radius
  5. 5. Ultrasonic Phased Array Limitations 2. Linear phased array probe alignment vs. the part - Bad probe positioning - Rounded parts 3. Curved phased array probe alignment vs. the part - Bad probe positioning (out of concentricity) - Variation of the radius along the scan axis Curved array good alignment (concentric) Curved array bad alignment (non-concentric) Linear array good alignment Linear array bad alignment R1 = 9.0mm R2 = 16.0 mm R1 R2
  6. 6. Coherent Adaptive Focusing (CAF)
  7. 7. Coherent Adaptive Focusing CAF is an iterative process that enables the transmission of a wave front parallel to the part Delay 0dB -3dB -6dB BeamWidth PA probe Wave front Part FW BW? 0dB -3dB -6dB BeamWidth PA probe Delay Part Wave front FW BW n iterations
  8. 8. Objectives
  9. 9. 1. Adapt the ultrasonic wave front to the real inspection scenario 2. Improve and simplify the inspection of a radius - Twisted parts - Nonconstant radius (varying, nonuniform, and weighted) 3. Compatible with: - Linear PA probe on a pseudo flat surface - Linear and curved PA probe on a radius (inside and outside) 4. Performance equivalent to phased array - Inspection speed must be similar to ultrasonic phased array 5. Reliable and robust - No data loss or convergence issues Objectives
  10. 10. Results – Inner Radius
  11. 11. Results – Inner Radius Test configurations 1. Curved array probe alignment - Out of concentricity - Misalignment Inner Radius – Out of Conc. (-) Inner Radius – Out of Conc. (+) Misalignment
  12. 12. Results – Inner Radius Part and Scan Parameters 1. Geometry: L shape 2. Radius: 9.0 mm to 15.0 mm 3. Max. out of concentricity: +15.0 mm 4. Probe: 3.5CC25-32R4
  13. 13. Results – Inner Radius
  14. 14. Results – Other Configurations FlatOuter Radius
  15. 15. Results – Other Configurations
  16. 16. Capabilities
  17. 17. Capabilities Name Results Maximum out of concentricity (+) 30.0 mm (-) 2.0 mm Maximum misalignment (horizontal) (±) 6.0 mm Maximum misalignment (vertical) (±) 6.0 mm Coverage 90.0° Detection (reliability & stability) All flaws detected & no data loss Name Results Maximum out of concentricity (+) 9.5 mm (-) 10.0 mm* Maximum misalignment (horizontal) (±) 6 mm Maximum misalignment (vertical) (±) 6 mm Coverage 90.0° Detection (reliability & stability) All flaws detected & no data loss Name Results Maximum tilt 25.0° Coverage at max. tilt d = L*cos(alpha) d: coverage L: probe length alpha: tilt angle Detection (reliability & stability) All flaws detected & no data loss Case 1: Inner Radius Inspection Case 2: Outer Radius Inspection * Until the probe touches the part Case 3: Tilted Probe/Part § Boundaries
  18. 18. Capabilities § Productivity Parameters Number of elements 32 Aperture size 4 Aperture steps 1 Water path 25 mm Material thickness 8.5 mm Material velocity 2700 ms Number of iterations 5 PRF with CAF PRF without CAF 300 Hz* 517 Hz Optimization is still possible to improve productivity
  19. 19. Conclusions
  20. 20. Conclusions About Coherent Adaptive Focusing § Enables the beams (focal laws) to adapt to the real inspection configurations § Relaxes the need on the mechanics to be perfectly aligned § Is compatible with linear and curved phased array probes § Makes the inspection of components easier with changing configurations (varying radius, varying aperture, pseudo flat) § Detection and speed performance is comparable to phased array § Easy to use by the operator
  21. 21. Thank You For more info please contact Etienne.grondin@olympus-ossa.com

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