Phased Array AND TOFD principles

Wedge Calculation

 

 

αi => Incident angle for a specific refracted angle from snell's law.

Eh => Height of the middle of the phased array probe – virtual emitting point.

Pw => Ultrasound path in the wedge.

Dw [μs] => Time-of-flight for specific angles in the wedges.

Ii => The index point length is the distance from teh back – or front – of the wedge to the exit point of a specific angle.

ω => Wedge angle.

Hi => Height in the middle of the first element.

Hw => Wedge height –back.

βi => Refracted angle in the test material.

p => Pitch.

L1 => Distance from the middle of the first element to the emitting point.

L2 => Distance from the emitting point to the intersection with the horizontal line – wedge contact surface.

VW=> Ultrasound velocity in the wedge.

VM=> Ultrasound velocity in the test material.

Data size

KS => Number of samples per line – S-scan length.

DL => Number of acquired lines.

RS => Number of triggers – C-Scan length.

IS => Inspection speed [mm/s].

SAR => Scan axis resolution [mm].

AR => Acquisition rate [B-scan/s].

 

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