Lesson 18 (Part 3) Flashcards Preview

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Flashcards in Lesson 18 (Part 3) Deck (10)
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1

What can echoes arriving to the transducer be as well?

Delayed
- phasing

2

What does delayed echoes allow?

1. Reception steering
2. Dynamic steering
3. Dynamic aperture

3

Reception steering

Listening from a particular direction

4

Dynamic focusing

Continual change of the focus with increasing depth
- similar to camera focus

5

Dynamic aperture

As the focus continues to change during echo reception, the aperture will increase to maintain a constant focal width

6

Annular arrays

Concentric rings
- piezoelectric material carved out in rings

7

What does the largest ring in annular arrays have?

The deepest focus

8

Why is annular arrays not used anymore?

Because we can do the same thing with phasing

9

What determines the beam width at the focus? (3)

1. Aperture
2. Focal length
3. Wavelength

10

In phasing, what happens to the reception beam? (2)

1. It is steered
2. Dynamically focused