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在加利福尼亚州南部的La Jolla以北的海域进行了一系列实验,实验中将一架单引擎螺旋桨的轻型飞机作为水下测量的声源。接收传感器分别为,海面上方1 m处的麦克风、15 m深海水中一套8个水听器的垂直线列阵和埋在海底75 cm深细沙中的水听器和切变传感器(或压电换能器)。飞机的螺旋桨噪声具有从80 Hz到1 kHz的一系列谐波分量,在大气、海水、海底的细沙中能同时探测到。根据在海底细沙中掩埋的单个水听器的低频声多普勒频移,提出了在沉积物中测量低频声速的方法。同时说明利用高速运动的飞机作为声源,可解决原来在沉积物中测量低频声衰减特性的困难。
A series of experiments were conducted in a sea area north of La Jolla in southern California where a light-engine, single-engine propeller was used as the sound source for underwater measurements. The receiving sensors are respectively: a microphone at 1 m above sea level, a vertical array of 8 hydrophone in 15 m deep seawater and a hydrophone and shear sensor (or pressure Electric transducer). The propeller noise of the aircraft has a series of harmonic components from 80 Hz to 1 kHz, which can be detected simultaneously in the sand of the atmosphere, seawater and seafloor. Based on the low-frequency acoustic Doppler shift of a single hydrophone buried in seafloor sand, a method of measuring low-frequency sound velocity in sediments is proposed. At the same time, it shows that the use of high-speed aircraft as the sound source can solve the difficulty of measuring the low-frequency sound attenuation characteristics in sediments.