METHOD AND APPARATUS FOR TUNING THE RISE TIME OF THE INITIAL PULSE OF AN AIR GUN

An air gun intended for use in generating seismic energy impulses, i.e. acoustical waves, in a body of water that provides improved performance by adjusting the length of the firing chamber in order to tune the rise time from zero pressure to peak pressure and to increase or decrease the slope of the initial pulse. By selecting the length of the firing chamber, the rise time of the initial pulse is tuned to increase low frequencies and reduce objectionable high frequencies to help in mitigating damage to marine life and the marine environment and to provide greater penetration of the seismic signal through for example basalt and sub-basalt structures. 种旨在用于在水体中产生地震能量脉冲即声波的气枪，该气枪通过调节击发室的长度以便调谐从零压力到峰值压力的上升时间并增大或减小起始脉冲的斜率来提供改进的性能。通过选择击发室的长度，起始脉冲的上升时间被调谐以增加低频并减少不期望的高频，以帮助减轻对海洋生物和海洋环境的损害，并帮助提供地震信号的穿过例如玄武岩或子玄武岩结构的较大的穿透力。