Accession Number : ADA131290

Title :   Optical Means of Measuring Particle-Sea Interactions in the Caribbean Sea and Gulf of Mexico.

Descriptive Note : Final rept. Jan 79-Mar 83,


Personal Author(s) : Carder,K L ; Steward,R G

PDF Url : ADA131290

Report Date : Apr 1983

Pagination or Media Count : 100

Abstract : A holographic image analysis system has been developed to measure the position, velocity, size, and shape of microscopic particles slowly settling in three-dimensional space. Images of particles recorded sequentially on individual holographic frames are reconstructed using an in-line, far field configuration. Image analysis is computer-controlled with two basic functions. First is the precision registration and XYZ positioning of the holographic frame so that accurate particle displacements between sequential frames can be measured. These displacements are compared are compared to the elapsed time between the frames to get particle settling velocity. Second, it scans a digitized video image of the reconstructed holographic image to measure size, shape, and area. A scanning algorithm has been developed to determine particle size (area, length, width) for classification by settling characteristics. An edge tracking algorithm has also been developed to facilitate particle identification by shape from frame to frame. A cataloging system was developed to provide for data entry, storage and retrieval. (Author)

Descriptors :   *Particles, Falling bodies, Oceans, Motion, Vertical orientation, Optical analysis, Holography, Edges, Optical tracking, Computer applications, Computer programs, Mica, Rates, Suspended sediments

Subject Categories : Physical and Dynamic Oceanography
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE