| Summary: | 碩士 === 國立中央大學 === 光電科學與工程學系 === 104 === 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.
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