Source Level - Power Limitations

Question 1

When does cavitation occur on a transducer?

Answer 1

When the peak pressure variation on the transducer faces is equal to the water vapour pressure.

Question 2

Describe interaction Effects

Answer 2

When many projectors are assembled together, the motion of an individual element will be affected by neighbouring elements.

Reduces power, affectsbeam pattern, impedence mismatches.

Question 3

How do you minimize Interaction Effects?

Answer 3

Separate elements up to a maximum of lambda/2 while still allowing sampling to occur at a sufficient rate (Nyquist Theorem). (IOT to beamform or receive, you need to sample at a sufficient rate which is based on the spacing between elements.)

Increasing size of elements

Using individual amplifiers