함정용 LED 탐조등 설계 및 제작

Abstract

A commercialized high power LED is widely applied not only on land, but also on merchant and naval vessels. However, the light source for replacement of halogen or xenon lamp is still under development.

This thesis dealt with the design and fabrication of an LED searchlight for naval vessels to replace the searchlight equipped with a 1kW halogen lamp. It has many advantages such as long lifetime, high luminous efficiency, instantaneous turn on and off, and high durability. In addition, it can withstand the vibration and impact caused by the rolling and pitching of vessels.

A simulation was carried out to investigate the influences of the focal length, diameter, and depth of parabolic reflector on the light condensing. Based on the results, a reflector with a diameter of 315mm and a depth of 25mm, and a COB type LED were selected as the optimal combination. Further, to increase luminous efficiency and lifetime of LED, a water cooling system was used to keep the junction temperature below 25℃. Finally, the LED searchlight can achieve a lifetime of 50,000 hours and a luminous efficiency over 100lm/W.

Luminous intensity of the proposed searchlight was 2.14 x 106cd, which was improved 500% with only 26% of power consumption compared with the 1kW halogen searchlight. Beam angle with a value of 1.94° also met the standard KDS-6230-1046.

In future, in case the light source gets more compact owing to the development of technology, the high performance LED searchlight with smaller size can be developed by reducing the diameter and depth of the parabolic reflector.