Phased Array Testing

NDT course on Phased Array Testing

Computer Based Training Course on AUTOMATED ULTRASONIC TESTING
Phased Array
DETAILED CONTENTS: Phased Array Testing
(see Contents )



1. PHASED ARRAY TECHNOLOGY
1.1 Introduction
- Phased Array transducer
- Ultrasound beamforming
- Beam steering
- Beam focusing
- Electronic scanning
- Signal imaging
1.2 Advantages and disadvantages of PA


2. PHASED ARRAY PROBE
2.1 Probe structure
 
2.2 Transducer
- Transducer shape
- Dimensional parameters
2.3 Wedge and types of waves
- Wedge-shaped base
- Zero-degree wedge (Plates)
- Wedge for complex shapes

3. WORKING PRINCIPLES
3.1 Beam forming
 
3.2 Beam steering
- Virtual transducer
- Focal laws
- Straight beam: Constant focal law
- Angled beam: Linear focal law
- Focused beam: Quadratic focal law
- Angled and focused beam
3.4 Acquisition cycles
- Emitting
- Receiving

4. ELECTRONIC SCANNING
4.1 Electronic beam steering
 
 
4.2 Electronic scanning modes
- Fixed angle scanning
- Sectorial scanning
- Combination of base scans
- Multichannel mode

5. BEAM FOCUSING
5.1 Focusing control
 
5.2 Focusing modes
- Constant focal distance
- Changing the focal distance
5.3 Dynamic focusing
 
5.4 Spatial resolution
- Spatial resolution
- Lateral resolution
- Elevation resolution
5.5 Probe resolution and characteristics
- Probe frequency
- Virtual aperture of the transducer
- Virtual aperture and lobes
- Summarizing table of resolution effects

6. SIGNAL PRESENTATION
6.1 Types of presentation
A-scan presentation
B-scan presentation
C-scan presentation
D-scan presentation
S-scan presentation
Combined presentations

7. PHASED ARRAY CALIBRATIONS
Introduction
Calibration block
Sensitivity adjustment
Construction of DAC curves
Determining the lateral resolutions
Calibration curves for sizing
Standard reference

8. CHARACTERIZATIONS AND SIZING OF DEFECTS
Introduction
Types of defects
Defect sizing
Defect position

9. WELD INSPECTION
Phased Array Inspection
Probe movement
Scan lines
Depth zones
Multi-channel mode (virtual probe)
Gate setting
Focusing for welding
Inspection speed
Scan plan

10. SELF-EVALUATION TESTS
Phased Array technology
Phased Array probe
Working principles
Electronic scanning
Beam focusing
Signal presentation
Calibrations
Characterisations of defects