Industry Applications

Industry Applications

GNR filter with marine chainlinks

 

1      Description of the inspection

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.

 

Fig.  1.- Calibration block.

 

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

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

 

 

 

2      Measurements over the calibration block

 

Fig.  2.- Original image of the test block (without GNR filter)

 

 

 

Fig.  3.- Image of the test block filtered with GNR.

 

 

3      Measurements over a real chain link prior the thermal treatment.

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.

 

 

4      Conclusions

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.

 

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