Most important results

Laboratory of ocean and atmospheric optics

Estimation of possibility of Oil Pollution Detection on Ice Cover of Sea Surface

On the basis of review of ice, snow and oil optical properties the analysis of the possibility of detecting oil pollution on the lower ice/water boundary is presented. The cases of observation from above by standard TV-system at daylight and from below by underwater laser-pulsed imaging system and the moving narrow-angle receiver are considered. It was shown that if the rare case of the pure crystal ice is excluded, observation from above under natural illumination is possible when the maximum ice thickness (without snow) is less than one meter. Observation from below by use of laser system is possible independently of snow presence and ice thickness from depth up to 30 m in the coastal waters and more than 40 m in ocean waters. If the moving narrow-angle receiver with an axis directed to zenith is used at daylight, the contrast oil-ice equals almost unity.

Publications:

  1. T.M. Radomyslskaya, I. M. Levin. Possibility of oil pollution detection on ice covers of sea surface. Fundamental and applied hydro-physics, № 4, p. 57-64, 2014.  Импакт-фактор РИНЦ - 0.152.

The development of the theory of underwater vision with respect to systems with an arbitrary width of the field radiation pattern

Two alternative approaches to the theory of underwater vision are proposed, which make it possible to determine both the range of visibility of small parts of the underwater object and the range of detection of the object on the whole with respect to vision systems with an arbitrary width of the field directional pattern (the angular field of view of the system). Ratios for calculation of image contrast, signal-to-noise ratio and detection and recognition ranges for underwater objects with arbitrary spatial structure and arbitrary viewing angle are derived.

Publications:

  1. L. S. Dolin, I. M. Levin, Theory Of Underwater Imaging, Fundamentalnaya i prikladnaya gidrofizika, 2015, № 2, p. 22-35. (Impact factor RSCI - 0.152)
  2. L. S. Dolin and I.M. Levin. Recent development in underwater imaging theory. Proc. International Conference on SubSea Technologies. SubSeaTECH2014, St-Petersburg State Marine Technical University, 2-5 June, 2014, St-Petersburg, Russia (invited speaker).14 P.

figure 1. The view of lidar PLD-1. On the top Optical unit of the lidar PLD-1. At the bottom Optical unit of the lidar mounted on the leveling device.

The development of the marine radiometric polarization lidar

In the Laboratory of Optics of the Ocean and the Atmosphere of the St. Petersburg Department of Institute of Oceanology RAS, in collaboration with the Laboratory of Optics of the Ocean of Institute of Oceanology RAS (Moscow), a new marine polarization lidar PLD-1 was designed to solve problems related to the determination of the spatial structure of the fields of hydrooptical characteristics, located in the thickness of the sea water. Lidar allows remote sensing of the ocean from a ship or an air craft.
The main feature of the lidar is the use of a diode-pumped laser. This provides a much longer lamp life compared to lamp pumping, small-size construction, high stability of metrological characteristics, and a lower level of electrical interference. The latter circumstance makes it possible to substantially increase the lidar sensitivity to inhomogeneities in the seawater thickness.

Optical unit of the lidar mounted on the leveling device is shown at the figure 1 (а, b).

Publications:

  1. Glukhov V.A., Goldin Yu.A., Gureev B.A., Rodionov M.A., the method of preparing the polarization lidar to full-size experiments // Proceeding of conference for young scientists «Complex study of the russian seas: operational oceanography and expeditional research», (Russia, Sevastopol, 24-29 April 2016г.), p.547-551, MGI RAS.
  2. Goldin Yu.A., Rodionov M.A., Gureev B.A., Glukhov V.A., Marine polarized lidar PLD-1, Proceeding of XIII Russian Conference "Applied technologies of hydroacoustics and hydrophysics", St. Petersburg, 2016, p.215-21.
  3. V.A.Glukhov, Yu.A.Goldin, M.A.Rodionov, Experimental estimation of the capabilities of the lidar PLD-1 for the registration of various hydro-optical irregularities of the sea water column // Fundamentalnaya i prikladnaya gidrofizika , 2017. № 2.
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