Outside the stray light protection angle, the point source transmittance of the optimized system is below 3 × 10 −5. The optimized system satisfies the detection requirements of the star sensor. The two methods are used to determine the final optimization scheme. The results show that reducing the total integrated scatter of the system structure surface (including the system inner wall surface and the porthole glass surface) and using a single-layer porthole can decrease the influence of structural stray light caused by the porthole. Standard Portlight Atlantic Portlight Accessories Lewmar Hatches & Portlights Control of light and ventilation is key to cabin temperature and to your comfort below deck. 10Inch Boat Yacht Round Porthole Opening Window Port Hole Port Light Hatch Marine. From the viewpoint of improving the surface optical properties of the system and optimizing the system structure, the suppression method for porthole structural stray light is studied. The star sensor has been unable to meet the detection limit requirements. Compared with the case without porthole structure, the point source transmittance of the star sensor can reach a maximum of 10 −4. This structural stray light is mainly composed of scattered light formed by multiple scattering between porthole glasses and scattered light formed by scattering between the inner wall of the system and the porthole glasses. The simulation calculations found that the surface scattering of the porthole glasses is the main reason that the porthole structure causes the stray light suppression effect to decrease. Point source transmittance is used as evaluation indices for the stray light suppression effect. White Star and Harland and Wolf fixed this by adding an additional two portholes into the forecastle to provide more light through two double portholes into the messes. On Olympic there were complaints about a lack of light in these quarters by the crew. Stray light sources, system geometry and surface optical properties are modeled respectively in the simulation scenario. Where these portholes are situated is the officers and crew messes. In this paper, the phenomenon of structural stray light caused by the porthole is simulated. Ground simulation experiments have shown that the detection capability of the star sensor is reduced, due to the increased stray light received at the detector, after the porthole structure is introduced into the optical path of the star sensor. Because of its round shape, it has inherently more strength and resistance to wave action.Ĭome join us on Gas Light, we would LOVE to sail with you on San Francisco Bay.Considering the needs of aerodynamic layout and high temperature protection, the star sensor is usually installed inside the near space hypersonic vehicle, and implements attitude measurement through porthole attached to the surface of the vehicle. Port holes are usually designed to be installed in more critically watertight areas where it can be sealed off and has a sturdy plate on the inside and outside for storm seas. The Firstlight Nautic Solid Brass Porthole Bulkhead Wall or Porch Light is in a Brass finish with a frosted glass diffuser. The main difference between the two is that a port hole is usually found lower on the hull or superstructure of the vessel. A port light is not usually found low on the hull where it is subject to high seas striking the vessel.Ī “port hole” on the other hand, is a round window, usually a little smaller than a port light. It usually has tempered glass for strength. Make your porthole creative, like having it designed as a clock window, like the one pictured below. If you want more than the typical window-with-a-view, focal point from your porthole window. A square, or rectangular window on a vessel is called a port light. A porthole window could give your kitchen a beautiful, and more interesting focal point, as well as stunning way to view your outside view. A “port light” is a square window on the exterior of the vessel. When we talk about a port light, we are not talking about light with a light bulb or the port-side running light on the left side of the vessel. Galamarine Round Porthole - Stainless Steel Port light for Boat/Yacht/RV Made of 316 marine grade Stainless Steel, Corrosion Resistance, Provide protection. The inspiration is taken from the porthole of the airplane. Bay Lights Charters very own Captain Steve explores the Nautical Lore describing a “port light” and a “port hole”. The Porthole Wall Light by Harry-Hongwei Yang.
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