Development of a 3-D Bioacoustic Imaging System

斯克里普斯研究所海洋物理实验室 海洋学将发展一种海洋航行的、立体的 生物声学成像系统 该系统解决了长期- 生物海洋学的长期要求， 描述小板块的分布和相互作用- 海洋中的营养生物。 使用蚊帐和其他 声学设备通常不足以描述 生物在某些重要的科学领域的分布 时空尺度。 成像系统基于 空间变化声穿透原理， 水柱中的空间分辨率依赖于同时 离散编码脉冲沿着窄声 梁。 这些声脉冲的反射， 在一个单一的传感器接收，然后可以破译从 通过复杂的数学运算产生一个图像 处理. 该系统将以500 kHz的频率运行， 设计成在30- 度立体角 在此频率下，仪器将 对浮游动物敏感，将用于绘制地图， 追踪这些小生物的分布 的3-D 生物声学成像能力将对许多 设想了未来十年的研究项目。 新 能力将提供有关相互作用的信息， 生物体在一定体积的水中的运动。

The Marine Physical Laboratory at Scripps Institution of Oceanography will develop a sea-going, three-dimensional bioacoustic imaging system. The system addresses a long- standing requirement within biological oceanography to describe the distribution and interactions of small plank- tonic organisms in the open ocean. The use of nets and other acoustic devices are often inadequate in describing the distribution of organisms in certain scientifically important spatial and temporal scales. The imaging system is based on the principle of Spatially Variant Insonification, whereby spatial resolution in the water column relies on simultaneous transmission of discrete coded pulses along narrow acoustic beams. The reflection of these acoustic pulses, that are received at a single transducer, can then be deciphered from each other and an image is produced by complex mathematical processing. The system will operate at 500 kHz and will be designed to have a useful range of 50 meters within a 30- degree solid angle. At this frequency, the instrument will be sensitive to zooplankton and will be used to map and follow the distribution of these small organisms. A 3-D bioacoustic imaging capability will be useful to a number of envisioned research projects over the next decade. The new capability will provide information on the interactions and movements of the organisms within a volume of water.