A method for measuring and calculating the irradiation angle of ship navigation lights

Abstract

The invention discloses a method for measuring an illumination angle of navigation light of a ship. The method for measuring the illumination angle of the navigation light of the ship comprises the following steps that step one, at least four center points of a hull body are measured by using a total station, and a center line of the hull body is obtained by correcting the center points of the hull; step two, the center line of the hull body is marked next to a tested navigation light, then an extension line of the inner side surface of a base plate of a lamp holder of the tested navigation light is drawn, the extension line is displaced in parallel to intersect with the center line of the hull body to obtain a first intersection point, then the extension line of the front end surface of the base plate of the lamp holder is drawn, a second intersection point is obtained by intersecting the extension line with the inner extension line of the base plate of the lamp holder, a third intersection point is obtained by intersecting the extension line with the center line of the hull, and the distance from the second intersection point to the first intersection point and the distance fromthe second intersection point to the third intersection point are measured respectively; and step three, an included angle between the inner side of the base plate of the lamp holder and the center line of the hull body is calculated by a triangular tangent function. The method for measuring the illumination angle of the navigation light of the ship does not require complicated instrument and equipment, and the measurement and calculation process is simple, and the cost is negligible.

Description

technical field [0001] The invention relates to a method for measuring and calculating the irradiation angle of ship navigation lights. Background technique [0002] According to the regulations of the Ministry of Communications, the red lights on the port side and the green lights on the starboard side, which are placed on the left and right sides of the highest deck of the ship, should each display uninterrupted lights within a horizontal arc of 112.5 degrees. It is displayed separately within 22.5 degrees from the front to the beam on each side. The light visor of sidelights shall be painted with matt black paint towards the light surface. The height of the visor is at least equal to the height of the lamp. Therefore, after a bow ship is built, the irradiation angle of the navigation lights will be measured. The side light in the navigation light is installed on the lamp holder by a special bulb, and the structure and size of the lamp holder should comply with the rele...

AI Technical Summary

Problems solved by technology

No matter which method consumes a lot of manpower and material resources, and is also greatly affected by the weather

During the measurement process, the naked eye observes the target one nautical mile away, and the visual measurement may be inaccurate due to the poor visibility of the weather or the height of the waves.

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