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HoloCam系统是著名多国多学科计划HoloMar(由MASTⅢ发起,欧洲委员会资助)中的主要项目。该计划与发展脉冲激光全息技术有关,目的是用该技术来分析、监测全球海洋生物和无机粒子的数量及其分布。本文介绍水下照相机样机的研制、结构以及对其评估。该样机主要用来拍摄处在自然状态下的海洋生物与粒子。同常规取样法相比,全息法拍摄的优点是:能对大体积(可达105cm3)的海水进行非介入式、非破坏性的拍摄,获得高分辨率的三维图像。该相机集同轴和离轴全息技术于一体,能捕获从几微米到几十厘米大小的粒子。在研制全息照相机HoloCam的同时,还研制专用的全息再现系统、自动数据采集和图像处理设备。这些设备将使该相机记录图像的效果达到最佳,从而使识别生物种类和绘制粒子浓度分布成为可能。
The HoloCam system is a major project in the well-known multi-disciplinary program HoloMar (sponsored by MAST III, funded by the European Commission). The program is related to the development of pulsed laser holography to analyze and monitor the number and distribution of marine organisms and inorganic particles worldwide. This article describes the underwater camera prototype development, structure and evaluation. The prototype is mainly used to capture the marine life in the natural state and particles. Compared with the conventional sampling method, the holographic method has the advantages of taking non-invasive and non-destructive shooting of large volume (up to 105 cm3) of seawater and obtaining high-resolution three-dimensional images. The camera combines in-line and off-axis holographic technology in one, can capture particles from a few microns to tens of centimeters in size. In the development of holographic camera HoloCam at the same time, also developed a dedicated holographic reproduction system, automatic data acquisition and image processing equipment. These devices will enable the camera to record images to the best effect, thus making it possible to identify biological species and to map the particle concentration distribution.