A Submersible Holographic Camera for the Undisturbed Characterization of Optically Relevant Particles in Water (HOLOCAM)
Abstract
Our long-term goal is to develop novel oceanographic instrumentation to address fundamental questions in ocean optics. The primary goal of this project is to develop a holographic instrument capable of imaging and characterizing natural (i.e. undisturbed) particle fields in the ocean. The longterm science goal is to understand the link between suspended particles and the bulk scattering properties of natural waters. We believe in-situ digital holographic microscopy, recently developed and employed for both fluid dynamics and biological studies, has the capability to obtain critical data relevant to this goal. Our overall objective is to develop an in-situ profiling digital holographic microscopy system (HOLOCAM) capable of characterizing the properties of optically relevant particles within a size range of < 1 to 1000 m. Our team will design, fabricate and characterize the HOLOCAM with the goal of commercialization. The HOLOCAM will be compact, submersible, capable of vertical profiling of undisturbed volumes of water, and with real-time visualization. It will quantify particle number, size and shape (e.g. cross-sectional area, surface area, aspect ratio, sphericity) and the 3-D spatial structure of the particle field (e.g. nearest neighbor distances). Identification of particles with unique shape characteristics (e.g. bubbles) and orientation should be achievable. The proposed HOLOCAM will extend the size range of particles currently resolvable by an existing system from a minimum of ~10 m down into the sub-micron range (thus capturing the full range of optically relevant particles).
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2013
- Accession Number
- ADA605131
Entities
People
- James M. Sullivan