arim.model.beamspread_2d_for_path#
- arim.model.beamspread_2d_for_path(ray_geometry)[source]#
Compute the 2D beamspread for a path. This function supports rays which goes through several interfaces (with virtual source).
Only the (conventional) incoming angles are used, it is assumed in that the outgoing angles follow Snell laws.
The beamspread has the dimension of 1/sqrt(r).
In an unbounded medium:
beamspread := 1/sqrt(r)
Through one interface:
beamspread := 1/sqrt(r1 + r2/beta)
where:
beta := (c1 * cos(theta2)^2) / (c2 * cos(theta1)^2)
- Parameters:
ray_geometry (arim.ray.RayGeometry)
- Returns:
beamspread
- Return type:
ndarray
References
Schmerr, Fundamentals of ultrasonic phased arrays (Springer), §2.5