明新科技大学光电系sbying@mustedutw.pdfVIP

Introduction of Photometry and Colorimetry 殷尚彬 明新科技大學光電系sbying@.tw Photometry Outline Properties of light Human vision system Radiometry and Photometry 色彩三要素 光: 照射物體,而其反射或透射光之光譜組成則被 改變 / 刺激視神經傳至大腦 物體: 接受光之照射，將其中之部份波長吸收，因 而改變光譜組成 / 將光反射、散射或透 射，而傳播出去 觀察者:人/儀器, 接收光，分析其光譜組成( 眼睛 / 分光儀)轉換成色彩(人腦/ 電腦) 顯色原理 顏色的分別 物體色的機制 顯色原理 When light encounters the surface of a material, three things happen: Transmission Reflection Absorption Transmission - Transparent light passes through an object without loss the object, is said to be transparent Transmission - Translucent light passes through an object with loss the object, is said to be translucent Transmission - Refraction Willebrord Snell 1580 ~1626 Snell’s law Refraction is affected by: •The angle at which light strikes the transparent •RI Absorption •Pigmentation of the object 顯色原理 Examples of spectral reflectance curves Outline Properties of light Human vision system Radiometry and Photometry The Human Eye Sclera - The outer layer of the eye. Cornea - The transparent section at front. Iris - Light enters through the cornea, passing through the diaphragm called Iris. Pupil - Colored part of the eye containing a variable sized hole. Retina - Inside back surface of the eye on which the light is focused. Optic Nerve - Cells in the retina are connected directly to the brain through optic fibers. Macula - The Macula, or fovea, is a small spot at the centre of the focus area in the r