Review by NDTnet
The paper is not shown in the proceedings.
C. Fiedler introduced
Laser Based Ultrasound
Advantages/Disadvantages
Advantages:
- Laser Based Ultrasound (LBU) inspections require minimum setup time.
- LBU inspections do not require special fixtures
- LBU works well on curved parts
- LBU works in production invironment
- Does not contaminates parts - can be used in-process
- Requires only single sided access
- LBU is cost effective in niche markets
Disadvantages:
- High Initial cost
- Less Sensitivity
- Inspection varies with material/coating
- Cannot penetrate honeycomb stiffened materials
- No through transmission
Conclusion:
- All four methods detect impact damage
- Each method has advantages and disadvantages:
- AUSS is very fast on flat pannels - slow on complex gemetries
- D Sight is fast, but only detects defects that cause surface changes, and only on flat parts
- MAUS is exellent for field inspection - does not works on sharp radius or curvature.
- LUIS works well on sharp radius or curvature - requires inspection bary it is not eyesafe.
 C. Fiedler shows the Principles
Comparison of a C- Scan Result: UT squirter (left) - Laser based Ultrasound (right)
Comparison: D-Sight - AUSS - MAUS - LUIS
Inspection Speed: AUSS - MAUS - LUIS
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C. Fiedler shows the Principles 
Comparison of a C- Scan Result: UT squirter (left) - Laser based Ultrasound (right)
Comparison: D-Sight - AUSS - MAUS - LUIS 
Inspection Speed: AUSS - MAUS - LUIS