Design, Construction and Implementation of a Submersible Pulsed Holocamera for Deep#Sea Detection of Particle Characteristics and Motions

约翰斯·霍普金斯大学和罗德岛大学将开展一个多学科合作的仪器开发项目，以开发和实施一种提高能力的方法，通过同时测量粒子特性和周围流体的小规模运动来解决粒子与海洋中小规模物理过程之间的相互作用。该项目涉及激光光学全息术和流体力学方法，以获取有关浮游生物动力学和颗粒特征的信息。脉冲红宝石激光全息相机将被改装用于海洋，并将利用全息术和数字图像处理方面的最新进展。设计标准要求在10微米到5厘米的尺寸范围内原位测量颗粒的数量、尺寸、分布、类型、取向和颗粒间的距离。样品体积内所有颗粒的瞬时速度也将通过采用用于激光片内运动传感的三脉冲技术来测量。当安装在潜水器上时，建议的仪器将在实验室或现场使用。运动传感全息相机的发展是因为人们越来越认识到，需要一种新的仪器来解决海洋科学和海洋流体力学中的一系列关键问题。目前可用的仪器不足以处理和测试关于浮游生物动力学和边界层流体动力学的复杂物理-颗粒相互作用的假说。

The Johns Hopkins University and University of Rhode Island will undertake a collaborative, multidisciplinary instru- mentation development project to develop and implement a means of increasing capabilities to resolve interactions between particles and small scale physical processes in the ocean by simultaneously measuring particle properties and small scale motions of the fluid surrounding it. The project involves laser optic holography and fluid mechanics methods to derive information about plankton dynamics and particle characterization. A pulsed ruby laser holocamera will be modified for use in the ocean and will use recent advances in holography and digital image processing. Design criteria call for in situ measurement of particle number, size, distribution, type, and orientation and inter-particle distances over a size range of 10 microns to 5 cm. Instantaneous velocity of all particles within a sample volume would also be measured by adapting triple- pulse techniques used for motion sensing within laser sheets. The proposed instrument will be usable in the laboratory or in the field, when attached to a submersible. The development of a motion sensing holocamera is driven by a growing recognition that a new class of instruments is required to address a series of critical questions in ocean science and marine fluid mechanics. Presently available instrumentation is inadequate to address and test hypotheses concerning complex physical-particle interactions of plankton dynamics and boundary layer fluid dynamics.