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把二只电声换能器安装在静力采样器箱体底部,测量声脉冲通过箱体中沉积物的传播时间,获得沉积物声速值;检测接收幅度,观察不同沉积物的衰减系数;利用LDC1—1型静力采样器的箱体与底架的相对位移带动多圈电位器的动臂,提供一个随取样深度而变化的电压值,由X—Y函数记录器记录。在取样的同时现场测量沉积物的声速和衰减的垂直分布。结果表明:实验室和现场所得的沉积物声速、声衰减与沉积物的类型密切相关。
Two electro-acoustic transducers are installed at the bottom of the static sampler box to measure the propagation time of the acoustic pulse through the sediment in the box to obtain the sediment sound velocity value. The receiving amplitude is measured to observe the attenuation coefficient of different sediments. The relative displacement of the cabinet and chassis of the LDC1-1 static sampler drives the boom of the multi-turn potentiometer to provide a voltage value that varies with the sampling depth and is recorded by the X-Y function recorder. The vertical distribution of sound velocity and attenuation of the sediments was measured on site simultaneously with the sampling. The results show that the sound velocity and sound attenuation of sediments in laboratory and field are closely related to the type of sediment.