Angle Beam Inspection Calculations
When performing an angle beam inspection, it is important to know where the sound beam is encountering an interface and reflecting. The reflection points are sometimes referred to as nodes. The location of the nodes can be obtained by using the trigonometric functions or by using the trigbased formulas which are given below.



 Nodes  surface points where sound waves reflect.
 Skip Distance  surface distance of two successive nodes.
 Leg 1 (L_{1})  sound path in material to 1^{st} node.
 Leg 2 (L_{2})  sound path in material from 1^{st} to 2^{nd} node.
 q_{R}  refracted sound wave angle.




Skip Distance Formulas


Surface Distance Formulas





Leg 1 and Leg 2 Formulas





Flaw Depth (1st Leg)


Flaw Depth (2nd Leg)








