For the system calibration, a test block was used, manufactured from a real chain link prior the thermal treatment (Fig 1). The test block has three flat bottom holes with different deeps in the welding zone.
Configuration parameters of the SITAU phased-array system are summarized in the following table:
Phased array probe |
|
Nº of elements |
32 elements |
Pitch |
0.5 mm |
Frequency |
5 MHZ |
Angular Scan |
|
Active aperture |
32 elements |
Start angle |
30º |
Final angle |
70º |
Angular step |
2º |
Acquisition |
|
Sound velocity |
3.200 m/s |
Initial range |
0 mm |
Final range |
650 mm |
Reception focus |
Dynamic focusing (DDF) |
Emission focus |
Emission Auto-focus |
Fig. 2.- Original image of the test block (without GNR filter)
Fig. 3.- Image of the test block filtered with GNR.
Fig. 4.- Original image of a real chain-link prior the thermal treatment (without GNR filter).
Fig. 5.- image of a real chain-link prior the thermal treatment after applying the GNR filter.
In the analyzed cases, the GNR filter reduces the grain-noise level about 6 times while maintaining the reflectors amplitudes. Hence, signal to noise ratio is improved about 16 dB.
Industrial Scanners
Aerospace Inspection Solutions
Flaw Detectors
Ultrasonic Flaw Detectors
Phased Array
Guided Wave
Pulser-Receivers
Integrated Inspection Systems
Bar Inspection Systems
Tube Inspection Systems
NDT Systems Instrumentation
Advanced NDT applications
GLASSFIBER BROKEN FIBERS
GLASSFIBER UNBOND
RAILWAY STEEL BOLTS
CASTING INCLUSIONS
AUTOMOTIVE NODULARITY
Applications
Application Notes
Applications Support
PDF Library
Video Gallery
Software Downloads
Training Academy
Obsolete Products
ISO Certifications