UT - Comparison SDH - FBH : Amplitude analysis

MONO-ELEMENT CONTACT  probe 2.25 MHZ, Ø6.35 MM

For the Ø6.35 mm contact probe at 2.25 MHz, the SV45° mode is used for inspection. The input signal frequency is 2.25 MHz, with 44% bandwidth and 147° phase.

The acoustic focusing depth is 3 mm, deduced from the simulated beam as illustrated below.

 

 

The results are calibrated versus the Ø3 mm FBH at 30 mm depth.

 

  Measured (dB) Simulated (dB) Difference (dB)
FBH Ø3 mm 0 0 0
SDH Ø2 mm -3.1 -3.5 0.4
SDH Ø1.5 mm -5.0 -5.8 0.8
SDH Ø1 mm -7.7 -7.7 0

 

MONO-ELEMENT CONTACT probe 2.25 MHZ, Ø12.7 MM, P45°

For the Ø12.7 mm contact probe at 2.25 MHz, the P45° mode is used for inspection. The input signal frequency is 2.25 MHz, with 50% bandwidth and 280° phase.

The acoustic focusing depth is 8 mm, deduced from the simulated beam as illustrated below.

 

 

The results are calibrated versus the Ø3 mm FBH at 30 mm depth.

 

  Measured (dB) Simulated (dB) Difference (dB)
FBH Ø3 mm 0 0 0
SDH Ø2 mm 2.2 2.3 -0.1
SDH Ø1.5 mm 1.3 1.4 -0.1
SDH Ø1 mm 0.3 -0.6 0.9

 

MONO-ELEMENT CONTACT probe 2.25 MHZ, Ø12.7 MM, SV 45°

For the Ø12.7 mm contact probe at 2 MHz, the SV45° mode is used for inspection. The input signal is the inverse P45° experimental direct specular echo of a Ø3 mm FBH, tilt 45° at 30 mm depth.

The acoustic focusing depth is 17 mm, deduced from the simulated beam as illustrated below.

 

 

The results are calibrated versus the Ø3 mm FBH at 30 mm depth.

 

  Measured (dB) Simulated (dB) Difference(dB)
FBH Ø3 mm 0 0 0
SDH Ø2 mm -2.7 -2.4 -0.3
SDH Ø1.5 mm -3.9 -4.4 0.5
SDH Ø1 mm -5.6 -6.6 1.0
 

 

Phased-array CONTACT probe of 20 elements with 0.7 mm ptich

For the phased array contact probe of 20 active elements (out of 48) with 0.7 mm pitch at 5 MHz, the P45° mode is used for inspection. The focal law is a P45° beam steering.

The acoustic focusing depth is 20 mm, deduced from the simulated beam as illustrated below.

 

 

The results are calibrated versus the Ø3 mm FBH at 30 mm depth.

 

  Measured (dB) Simulated (dB) Difference (dB)
FBH Ø3 mm 0 0 0
SDH Ø2 mm -3.2 -2.5 -0.7
SDH Ø1.5 mm -4.5 -3.8 -0.7
SDH Ø1 mm -5.8 -5.3 -0.5

 

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