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引言本文所评价的震源是德克萨斯仪器公司在海洋地震勘探中使用的空气枪。据作者了解,以往对气枪测定的唯一的效率是基于等温系统的声效率。现在的分析将表明,该系统不是等温的,且枪的效率随枪的深度增加而减小。气枪的工作原理是:大量的高压(2000磅/平方英寸)空气在水中突然释放形成一个气泡。产生的气泡振动(膨胀或收缩)直到所有的能量消耗完为止。能量的一部分为声辐射,剩余部分则粘性地消耗。我们可以更详细地研究这一过程:当高压空气释放时就会发射一个声脉冲,该声脉,冲的振幅和上升时间主要取决于枪室的压力(Pc)、容积(Ve)及引爆处的静水压力(Po)。能量的一部分作为第一脉冲而释放,其余的则作为气泡的位能作用于周围的海面上。而
Introduction The source evaluated in this article is an air gun used by Texas Instruments in marine seismic exploration. According to the author, the only previous efficiency of airgun determination was based on the isothermal system’s acoustic efficiency. The present analysis will show that the system is not isothermal and the efficiency of the gun decreases as the depth of the gun increases. Airsoft guns work on the principle that a large amount of high pressure (2000 psig) air suddenly releases in the water to form a bubble. The resulting bubble vibrates (expands or contracts) until all energy is consumed. Part of the energy is acoustic radiation, while the remaining part is viscously consumed. We can examine this in more detail: When high-pressure air is released, an acoustic pulse is emitted. The amplitude and rise time of the acoustic pulse, the pulse, depend mainly on the pressure (Pc), volume (Ve) Hydrostatic pressure (Po). Part of the energy is released as the first pulse, and the rest acts as a bubble on the surrounding sea surface. and