Study of the Feasibility of Using an Advanced Opto-Electronic Imaging Technique for Sampling Mid-Water Nekton.
Abstract
The feasibility of identifying mid-water nekton at 100 meters in clear ocean water using a fan shaped laser beam in conjunction with a photodiode array detector in a towed system is examined. It has been found that for myctophids and euphasiids, identification can be made only at ranges of 10 to 20 meters and is detector and light source limited. Calculations are presented that show the need for either computer or optical pattern recognition for the rapid identification and counting of these nekton. Both geometric and bioluminescent characteristics are examined as possible condidates for recognition parameters. At high tow rates (about 10 knots) the need for optical pattern recognition has been found to be necessary. Methods are suggested for both optical pattern recognition and sea water optical characteristics simulation to evaluate developed optical recognition systems for myctophids. An appendix presents general characteristics of mid-water nekton with an analysis of the electronic transmission requirements and limitations at mid-water depths. A selected bibliography is also presented on mid-water nekton. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1978
- Accession Number
- ADA062755
Entities
People
- Harry Sadjian