長距離固態照明投射燈之橫向明視度之研究;Study of Transverse Brightness of Long-Distance Solid-State Spot Light

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题名:	長距離固態照明投射燈之橫向明視度之研究;Study of Transverse Brightness of Long-Distance Solid-State Spot Light
作者:	張宏瑋;Chang, Hung-Wei
贡献者:	光電科學與工程學系
关键词:	中場擬和法;投射燈;投射距離;光源模型;燈塔;pcW-LEDs
日期:	2023-08-15
上传时间:	2024-09-19 15:50:41 (UTC+8)
出版者:	國立中央大學
摘要:	本研究探討長距離固態照明投射燈的橫向亮度。在此選用LED固態光源，因其具有節能、長壽命和高光效等優點，廣泛應用於室內和室外照明領域的光源。本研究首先對LED特性進行了分析。並通過模擬和優化，我們以中場擬和法製作其光源模型，並由此光源挑選出適合的光杯及透鏡製作遠距離投射燈，在此條件下單一光學模組以7.8W驅動下，照射角度之半高全寬為1.45°，投射距離可達 1,181 m ，整組投射燈採取4×4陣列方式排列，其照射角度之半高全寬為1.71°，投射距離可達 4.17 km，以25組投射燈達成投射距離20km。接下來，我們將投射燈以不同橫向數量排列及不同仰角進行記錄，並紀錄投射燈的灰階分布，並根據測量結果進行了數據分析和比較。實驗結果表明，在相同投射距離下，不同橫向擺放數量將會影響近距離視覺效果而遠距離則無差異。綜上所述，本研究的結果表現，通過改變投影燈的擺放，不會影響其遠距離的視覺對比度。而若將投射燈應用在燈塔方面與台灣光強度最強燈塔鵝鑾鼻燈塔比較，光強度為2.22倍，根據IALA 規範可以投射48海里。;This study explores the lateral luminance of long-distance solid-state lighting projectors. LED solid-state light sources were chosen for their advantages in energy efficiency, long lifespan, and high luminous efficacy, making them widely used in indoor and outdoor lighting applications. The characteristics of LEDs were initially analyzed. Through simulation and optimization, we constructed their light source model using the center field fitting method. Based on this model, suitable reflectors and lenses were chosen to create long-distance projection lamps. Under these conditions, a single optical module driven at 7.8W achieved a half-power beam width (HPBW) of 1.45° for the illumination angle, enabling a projection distance of up to 1,181 meters. By arranging the projection lamps in a 4x4 array, the HPBW of the illumination angle was 1.71°, resulting in a projection distance of 4.17 kilometers. A combination of 25 sets of projection lamps achieved a remarkable projection distance of 20 kilometers. Subsequently, we recorded the arrangement of projection lamps with different lateral quantities and varying elevation angles. We also documented the grayscale distribution of the projection lamps. Data analysis and comparisons were performed based on the measurement results. The experimental outcomes revealed that, under the same projection distance, different lateral arrangements influenced the visual effect at close distances while showing no discernible difference at longer distances. In conclusion, the results of this study demonstrate that altering the arrangement of projection lamps does not impact the visual contrast at long distances. Moreover, when applying projection lamps in lighthouse scenarios and comparing them with Taiwan′s most intense lighthouse, the Guishan Island Lighthouse, the light intensity was amplified by a factor of 2.22. Additionally, in accordance with IALA regulations, it can project up to 48 nautical miles.
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