https://wiki.yanding.com/ 2026-07-25T00:54:50+00:00 https://wiki.yanding.com/ https://wiki.yanding.com/lib/tpl/myconfluence/images/favicon.ico text/html 2026-07-24T05:20:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.yanding.com/doku.php?id=en:yanding:imaging_basics:optics:radiation_and_luminescence:blackbody&rev=1784870427&do=diff Blackbody I. What is a Blackbody? A blackbody is an idealized physical model under thermal equilibrium (energy conservation), which completely absorbs all wavelengths of incident electromagnetic radiation without reflection or transmission. Per the law of conservation of energy:$$M_\lambda(\lambda, T) = \frac{c_1}{\lambda^5} \frac{1}{e^{\frac{c_2}{\lambda T}} - 1}$$$M_\lambda$$W \cdot m^{-3}$$\lambda$$T$$c_1 = 2\pi h c^2$$W \cdot m^2$$c_2 = \frac{hc}{k_B}$$m \cdot K$$k_B $$J \cdot K^{-1}$$\l… text/html 2026-07-24T05:20:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.yanding.com/doku.php?id=en:yanding:imaging_basics:optics:radiation_and_luminescence:fluorescent_lamp&rev=1784870427&do=diff FIXME This page is not fully translated, yet. Please help completing the translation. (remove this paragraph once the translation is finished) Light Emission Principle and Spectral Characteristics of Fluorescent Lamps 1. Light Emission Principle text/html 2026-07-24T05:20:31+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.yanding.com/doku.php?id=en:yanding:imaging_basics:optics:radiation_and_luminescence:lambertian_surface&rev=1784870431&do=diff Lambertian Surface I.Definition A Lambertian surface (also referred to as a perfectly diffuse emitter or ideal diffuse reflector) is an idealized model in optics, radiometry, and photometry. It is defined as a surface whose radiance is constant in all viewing directions.$$ I_\theta = I_n \cos\theta $$$I_\theta$$\theta$$I_n$$\theta$ text/html 2026-07-24T05:20:31+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.yanding.com/doku.php?id=en:yanding:imaging_basics:optics:radiation_and_luminescence:led&rev=1784870431&do=diff Light-Emitting Diodes (LEDs) I.Definition A Light-Emitting Diode (LED) is a solid-state semiconductor device centered around a PN junction. When an electric current passes through the chip, electrons from the N-type region and holes from the P-type region undergo radiative recombination at the junction. This process releases energy in the form of photons, achieving the direct conversion of electrical energy into light.$E_g$$E = h\nu$$c = \lambda\nu$$\lambda$ text/html 2026-07-24T05:20:27+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.yanding.com/doku.php?id=en:yanding:imaging_basics:optics:radiation_and_luminescence:light&rev=1784870427&do=diff FIXME This page is not fully translated, yet. Please help completing the translation. (remove this paragraph once the translation is finished) Light Light, as a core carrier spanning the fields of optical engineering and electronic information, is a key medium for energy transfer and information transmission. From basic illumination and high-precision imaging to fiber-optic communication, laser precision manufacturing, and cutting-edge quantum technologies, the applications of light are dee…