Generator of high power elastic pulses focused in a liquid and obtained by impact

The assembly of a high power high frequency elastic pulse generator having an elastic wave radiating surface and a liquid containing enclosure having a wall surface portion in which said elastic wave radiating surface is rigidly mounted for propagating elastic waves within the liquid, wherein said pulse generator comprises:

• i. an anvil having said radiating surface and an impact surface opposite said radiating surface and at a distance therefrom;
• ii. a hammer comprising a thrust part and an impact part of a thickness substantially lower than said thrust part, said impact part having an outer impact surface facing said impact surface of the anvil and parallel thereto;
• iii. and actuating means for periodically propelling and returning the hammer alternately at said high frequency to bring the hammer to an active position of cooperation with the anvil and return it to a rest position far from the anvil, said actuating means comprising means for propelling the thrust part from the rest position to the active position then stopping the thrust part in the active position in which said outer impact surface of the impact part does not engage the impact surface of the anvil and immediately returning the thrust part towards its rest position while the impact part moves towards the anvil until engagement of the impact surface thereof with the impact surface of the anvil and
• iv. resetting means for disengaging the impact part from the anvil immediately after said engagement.