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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71549

    Title: 影像式相對強度分佈量測之研究;Study of Goniophotometry on Relative Intensity of Light Sources
    Authors: 蕭堯中;Hsiao,Yao-Chung
    Contributors: 光電科學與工程學系
    Keywords: 影像式輝度量測儀器;配光曲線;雙向穿透分佈函數;Goniophotometer;ILMD;BTDF;Luminance intensity distribution
    Date: 2016-07-26
    Issue Date: 2016-10-13 13:16:00 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 為了能有效的設計光學或照明系統,光源的配光曲線參數對光學模擬軟體而言是不可或缺的重要參數。傳統是透過測角光度計(Goniophotometer)以機械方式掃描光源在空間中的輝度分佈而取得數據。雖然有效,卻花時費工且成本高昂。因此使用者也不斷的關注是否有替代產品的出現。隨著近幾年來電腦軟體與硬體的逐漸成熟,影像式輝度量測儀器(ILMD)的可能性也越來越有機會實現。
    透過理論的研究與實驗實作,本研究提出了一個系統性的設計,包含了機構與演算法的設計,並嘗試以該系統藉由CCD一次取像而能完成對於單一顆LED於空間中的相對強度分佈量測。藉由針對硬體本身的校正(噪訊校正、灰階值響應校正、鏡頭像差所引起的影像變形校正與亮度均勻度的校正) 與演算法的補償(真實入射角修正、BTDF雙向穿透分佈函數、套用穿透率補償、吸收度補償、以及立體角常規化、Cosine 函數補償),進而提高了整個量測系統的準確性。
    ;The relative intensity distribution curve is necessary for engineers to design optical system. Traditionally we use goniophotometer to obtain data. It works but takes much time. Much necessary space also costs too high. In such a way, users are concerned about the emergence of alternatives. With great progress both on the software and the hardware in recent years, the possibility of imaging luminance measurement device (ILMD) is getting promising. Through theory research and experiments, this study presents a systematic design includes mechanical design and algorithms to obtain relative intensity data of a LED just by one snap.
    To improve system stability, we have done hardware calibration (CCD noise, gray value response, image distortion and Vignetting ) for CCD and lens system to make sure only right data can be input to main algorithm. To improve the accuracy of the system, the calibration algorithm is including finding real incidence angle, BTDF, transmittance, absorption rate, solid angle normalization, and cosine law function.
    Appears in Collections:[光電科學研究所] 博碩士論文

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