拖曳线列阵管中校准方法研究

Investigation on the thechnique of calibrating towed-line array in tube

本文阐述了一种在长管中校准拖曳线列阵或其阵元组的方法，这种方法通过在线列阵上形成一个等效于其接收到一个任意角度入射的自由场平面坡时的声场分布来校准线列阵的复数灵敏度和远场指向性。在阐述了这种校准方法的基本原理以后。通过建立理论模型，用计算机模拟研究了该方法的可行性及校准声场偏差与各种参数之间的关系，并对其结论进行了实验验证。实验线列阵的方向性和灵敏度的测量结果表明，在低频情况下该方法是校准长线列阵的有效方法。

Abstract: In this paper, a technique for calibrating a towed-line array or one of its groups of elements in a long tube is described. In this technique, the complex senstivity and far--field directivity of line -array are measured by producing a field that is equivalent to a free-field plane wave of any incidence on the array. First, the fundamental principle of this technique is presented. Then the applicability of the technique and the relation between the quality of the simulated field and the parameters are investigated by computer simulation after a theoretical model is set up. Finally, the conclusion are tested by experiments. The measured sensitivity and pattern of a four-elements line array and the measured pattern of a two-elements array have shown that this technique is a very efficient method for calibrating long-line array in low frequency.