Low Light Auto-Radiometer for Deep Sea Irradiance Measurements

用于深海辐照度测量的微光自动辐射计

• 批准号: 8917502
• 负责人: Edith Widder
• 金额: --
• 依托单位: Harbor Branch Oceanographic Institution, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-15 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917502&HistoricalAwards=false
• 关键词: Low; Light; Auto; Radiometer; Deep

The Harbor Branch Oceanographic Institution will undertake a project to develop a sensitive radiometer for in situ measurements of irradiance in the water column. Optical measurements at sea are becoming increasingly important to ocean science field investigations and adequate optical instrumentation is often lacking. The low light auto- radiometer (LoLAR) will employ a photomultiplier tube which allows greater sensitivity than silicon-photodiode based technology permits on currently used instruments. The new instrument will increase the sensitivity of light level detection and measurement by a factor of five. At-sea use of photomultiplier tube instrumentation requires development of several special design features, including autocalibration, temperature dependency corrections, light collection, and data acquisition. In situ irradiance measurements have been primarily restricted to the near surface waters of the ocean because of limited instrumentation sensitivity. Several types of ocean science research investigations would benefit from increased sensitivity by being able to make light measurements deeper in the water column. The types of research that would benefit from this new instrument include hydrologic optics that relate to physical properties affecting light penetration in the ocean as a function of depth; photophysiology of populations, concerning the distribution of organisms and their orientation as related to different light fields; and bioluminescence research. The general purpose instrument will be usable on submersibles, remotely operated vehicles, moorings, nets, and profiling systems.

海港分支海洋学研究所将开展一个项目，开发一种灵敏的辐射计，用于现场测量水柱中的辐照度。海上光学测量对海洋科学领域的调查越来越重要，但往往缺乏适当的光学仪器。弱光自动辐射计（LoLAR）将采用光电倍增管，其灵敏度高于目前使用的仪器上基于硅光电二极管的技术。新仪器将把光水平探测和测量的灵敏度提高五倍。在海上使用光电倍增管仪器需要开发几个特殊的设计功能，包括自动校准，温度依赖性校正，光收集和数据采集。由于仪器灵敏度有限，现场辐照度测量主要局限于海洋近表面沃茨。几种类型的海洋科学研究调查将受益于能够在水柱更深处进行光测量而提高的灵敏度。将受益于这一新仪器的研究类型包括：水文光学，涉及影响光在海洋中穿透的物理特性，作为深度的函数;种群生物生理学，涉及生物的分布及其与不同光场的关系;以及生物发光研究。该通用仪器可用于潜水器、远程操作潜水器、系泊设备、网和剖面测量系统。