论文部分内容阅读
充液聚焦球形反射体(简称充液球)是一种理想的标准反射体。它有几何尺寸小、目标强度大、频率特性好、方向性均匀、成本低、海上布设方便等优点。常用于水声学测量和水声设备的检验,校准及有关人员训练之用。在文献中研究了充液球的目标强度,聚焦增益与频率、方位、折射率的关系,着重研究在温度变化的情况下提高聚焦增益的问题。国外对充液球的目标强度作过研究,但这些工作都是在短脉冲情况下做的。而实际工作中常常使用长脉冲,因此仅有短脉冲结果是很不够的,所以本文着重研究了长脉冲情况下的聚焦增益及其频率特性。
Liquid-filled focusing spherical reflector (referred to as filling the ball) is an ideal standard reflector. It has the advantages of small geometric size, large target intensity, good frequency characteristics, uniform directivity, low cost and convenient layout at sea. Commonly used in water acoustics measurement and acoustic equipment inspection, calibration and related personnel training. In the literature, the relationship between target intensity, focusing gain, frequency, azimuth and refractive index of liquid filled sphere is studied, and focusing on the problem of increasing the focusing gain under the condition of temperature change is studied. Foreign research on the target intensity of the liquid filled ball, but these are done in the case of short pulses. However, the long pulse is often used in practical work. Therefore, only the result of short pulse is not enough. Therefore, this paper focuses on the focusing gain and its frequency characteristics under long pulse.