几个光学术语的解释以及换算关系(国外英文资料).docVIP

几个光学术语的解释以及换算关系(国外英文资料) The interpretation and conversion relations of several optical terms What is the meaning of luminous intensity (luminosity)? Answer: the luminous intensity (luminosity, I) is defined as the luminous intensity in a certain direction of the point light is emitted from the light emitting body in unit time, also referred to as photometric, common units for candlelight (CD, Candela), the definition of a candle is made by whale international oil candle burning 120 per hour cold (grain) issued a cold light, equal to 0.0648 grams What is the unit of luminous intensity (luminosity) of 2.? Answer: the luminous intensity of common units for candlelight (CD, Candela), the international standard candle (LCD) is defined as the ideal blackbody in platinum freezing point temperature (1769 DEG C), perpendicular to the blackbody (the surface area of 1m2) in the 60 direction 1/10000 luminosity, the so-called ideal blackbody is an object of the radiation rate is equal to 1, absorbed energy can be emitted, the uniform temperature has remained fixed, the international standard candle candle (candela) with the old standard (candle) of the exchange relation is 1candela=0.981candle 3. what is called luminous flux? What is the unit of luminous flux? Answer: luminous flux (PHI) is defined as: point light source or non point light source in the unit time of the energy, which can produce visual (people can feel the radiation flux), known as luminous flux. The luminous flux unit for Liu Ming (LM), Liu Ming 1 (lumen or LM) light flux is defined as the international standard of Zhu Guang by the unit of solid angle of the arc, the entire spherical surface area of 4 PI R2, so Liu Ming Zhu Guang issued a flux equal to the flux of 1/4 PI, or spherical 4 PI, so according to Liu Mings definition of a CD point light source radiates 4 PI Liu Ming (Liu Ming =4), namely Phi PI I (Zhu Guang), delta omega assumed stereo arc small angle, delta omega in solid angle light flux of delta ph