Patent ID: 11953634
Assignee: SERCEL
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. A seismic source for generating seismic waves under water, the seismic source comprising:
an operating head having discharge ports;
a firing chamber attached to the operating head, the firing chamber configured to hold compressed air to be discharged through the discharge ports; and
a shaft located within the operating head and configured to move between a close state, in which the compressed air in the firing chamber is preventing from reaching the discharge ports, and an open state, in which the compressed air in the firing chamber is discharged through the discharge ports,
wherein the shaft has an external surface and a longitudinal channel having a varying depth, and the longitudinal channel is formed in the external surface so that air passes from the operating chamber to the cushion chamber, when in the open state, through the longitudinal channel.