According to Chinese daylighting climate data,combined with the standard of Commission Inernationale de l'Eclairgae(CIE) general sky luminance distribution(SLD),the sky luminance distribution of typical daylightin...According to Chinese daylighting climate data,combined with the standard of Commission Inernationale de l'Eclairgae(CIE) general sky luminance distribution(SLD),the sky luminance distribution of typical daylighting climate zones in China was studied.Through the research on reference SLD of overcast,intermediate and clear types,the standards of clear and overcast SLD are consistent with CIE general sky,and the intermediate SLD has greater error with CIE general sky.The main types of Chinese sky luminance in different daylighting climate zones were obtained,which provide the basic data for simulation and forecast of China natural light,and provide reference for using the standard amendments of China future natural light.展开更多
In terms of asymmetrical three-dimensional distribution(ID) of luminous intensity(LI) of light-emitting-diode(LED),a testing system was conducted in this study. Design and principle of the testing system were introduc...In terms of asymmetrical three-dimensional distribution(ID) of luminous intensity(LI) of light-emitting-diode(LED),a testing system was conducted in this study. Design and principle of the testing system were introduced. 31 photometers were placed on a concentric circle,and all of them were used to gather LI data of LED at the same time. The data acquisition card(DAC) was used to gather multichannel data and controlled motor. Experimental results indicated that the testing system had achieved the goal of testing three-dimensional distribution of LI. And each parameter could meet the requirements of industrial production and measurement.展开更多
Flame temperature distribution is one of the most important characteristic parameters in combustion research. The emission method is a good way to measure the luminous flame temperature field. The maximum entropy meth...Flame temperature distribution is one of the most important characteristic parameters in combustion research. The emission method is a good way to measure the luminous flame temperature field. The maximum entropy method is introduced to the temperature distribution measurement of a luminous flame using the emission method. A simplified mathematical model was derived by combining the thermal radiation theory, reconstruction algorithm and maximum entropy method. Suitable parameters were selected in the computing process. Good experimental results were obtained with pulverized coal flames.[展开更多
基金Project(50908239) supported by National Natural Science Foundation of China Project(2010KB14) supported by State Key Laboratory of Subtropical Building Science of South China University of Technology, China Project(CDJZR10190006) supported by the Fundamental Research Funds for the Central Universities, China
文摘According to Chinese daylighting climate data,combined with the standard of Commission Inernationale de l'Eclairgae(CIE) general sky luminance distribution(SLD),the sky luminance distribution of typical daylighting climate zones in China was studied.Through the research on reference SLD of overcast,intermediate and clear types,the standards of clear and overcast SLD are consistent with CIE general sky,and the intermediate SLD has greater error with CIE general sky.The main types of Chinese sky luminance in different daylighting climate zones were obtained,which provide the basic data for simulation and forecast of China natural light,and provide reference for using the standard amendments of China future natural light.
文摘In terms of asymmetrical three-dimensional distribution(ID) of luminous intensity(LI) of light-emitting-diode(LED),a testing system was conducted in this study. Design and principle of the testing system were introduced. 31 photometers were placed on a concentric circle,and all of them were used to gather LI data of LED at the same time. The data acquisition card(DAC) was used to gather multichannel data and controlled motor. Experimental results indicated that the testing system had achieved the goal of testing three-dimensional distribution of LI. And each parameter could meet the requirements of industrial production and measurement.
文摘Flame temperature distribution is one of the most important characteristic parameters in combustion research. The emission method is a good way to measure the luminous flame temperature field. The maximum entropy method is introduced to the temperature distribution measurement of a luminous flame using the emission method. A simplified mathematical model was derived by combining the thermal radiation theory, reconstruction algorithm and maximum entropy method. Suitable parameters were selected in the computing process. Good experimental results were obtained with pulverized coal flames.[
