Flashcards in Lesson 18 (Part 3) Deck (10)
What can echoes arriving to the transducer be as well?
What does delayed echoes allow?
1. Reception steering
2. Dynamic steering
3. Dynamic aperture
Listening from a particular direction
Continual change of the focus with increasing depth
- similar to camera focus
As the focus continues to change during echo reception, the aperture will increase to maintain a constant focal width
- piezoelectric material carved out in rings
What does the largest ring in annular arrays have?
The deepest focus
Why is annular arrays not used anymore?
Because we can do the same thing with phasing
What determines the beam width at the focus? (3)
2. Focal length