| Summary: | 碩士 === 國立臺灣科技大學 === 色彩與照明科技研究所 === 103 === The color spatial distribution (CSD) of LED light source was studied in recent years. However, the traditional modeling method of LED did not include the information of CSD. According to this issue, we propose a new method by measuring hyperspectral image and far-field radiation pattern to establish chromatic source model (CSM) which including the properties of intensity and color distribution for LED light source.
In this study, we analyzed three types of white light LED by measuring mid-field measurement and the definition of angular correlated color temperature deviation (ACCTD). These analyzing results were used to verifying the CSM. According, the normalized cross correlation (NCC) between measurement and simulation of intensity distribution and color distribution are all higher than 0.995 and 0.95, respectively. In order to obtain the more accuracy CSM, we further compare the ACCTD of measurement and simulation through mid-field. The differences of ACCTD between measurement and simulation are 405K, 220K, and 2497K, respectively. The ACCTD of Case 3 is acceptable because the average CCT of Case 3 is up to 24767K.
Furthermore, we compared CSM of Case 1 with the radiant source model of Case 1, which established by using the SIG-400 (Source Imaging Goniometer®, Gen. 4). According the simulate process, there is a huge difference between the result of the SIG model and mid-field measurement. The differences of ACCTD between SIG model and mid-field measurement is 3945K, higher than 405K of our model.
In conclusion, this new modeling method of CSM is much easier, faster and more accurate in both intensity and color spatial distribution than traditional method.
|
|---|
