Abstract : the measurement method of the polarization grade for the source and depolarization and the concept of the polarization error for the illuminance meter are described 文摘:介绍了光源偏振度的测量和消偏振的方法以及照度计偏振误差的概念。
Changzhou yuanguang yaming electrical appliance co . , ltd . is professional producer of court droplights , business illuminance tools and various specifications ballast , trigger 常州市源光亚明电器有限公司拥有一批经验丰富的工程技术人员和完善的企业管理体系。
Methods to study the photic stabilities of these three types of pigment in an uniform environmental condition , using the same radiation lamp - house with the same illuminance 方法在统一的环境条件下，使用相同的辐射光源、照度，在近似相同的初始吸光度值下，对这三种色素的光稳定性进行比较研究。
When the illuminance rose , the photic decomposition rates of the natural anthocyan pigments rose as well , but there was no linear relation between photic decomposition rate and illuminance 随着照度的增大，花青素类色素的光降解速率也增大，但光降解速率常数的改变和照度之间不存在线性对应关系。
Ratio of the average illuminance on the working plane after a specified period of use of a lighting installation to the average illuminance obtained under the same conditions for a new installation 照明装置使用一定时间后工作面上的平均照度，与通常认作是新照明装置在相同条件下得到的平均照度之比。
The sub - bands are coded and the information of direction cosine is used for iris matching , by means of which this method overcomes zoom , shift and illuminance and obtains approving effect 将分解后子带作为特征编码，利用空间向量的方向夹角余弦作为匹配方法，有效克服了缩放、平移、光照等影响，达到了较好的识别效果。
But those were not enough - cause there are many factors that affect daylight , we cannot grasped the rule of daylight change . so most countries in the world , made the outdoor horizontal illuminance of overcast sky as the daylighting standard 为解决这些问题，各国的学者通过对本国光气候的长期观测得到了晴天天空、阴天天空和中间天空的天空亮度分布，并希望以此为依据，制定各个不同国家和地区的采光标准和天然采光的计算方法。
In the third part , the method of software realization on measure - controlling is given out , so we can automatically control the measurement course , data collecting and data processing automatically , the transforming of the tiff format , the produce of the equal illuminance curve 然后给出了测量控制软件实现的方法，从而实现用计算机对整个测量过程和数据采集，处理的自动控制， tiff格式图像的转换，生成等照度曲线图等，其中关键部分给出了源程序。
Secondly , image enhancement technique based on linear filtering is adopted . a new image segmentation method by means of automatic multilevel threshold is given , which realizes partial multilevel threshold segmentation based on image region partition of gray - level position projection , removes the influence of uneven illuminance or uneven gray - level distribution on goal recognition , and resolves the problem of error segmentation caused by threshold step between adjacent regions by threshold transition . the method has well robustness 在图像处理时，采用基于线性滤波的图像增强方法，并提出了一种新的自动多阈值图像分割方法，该方法以基于灰度位置投影的图像分区实现局部多阈值分割，克服了不均匀照明或不均匀灰度分布对目标识别的影响，同时，通过阈值过渡很好地解决了相邻区域阈值“阶跃”引起的错误分割问题，具有很好的鲁棒性。
Experiment research shows : this system has certain precision of observing and controlling , according to the need that the crop grows , this system has realized the automatic regulation to four kinds of main environmental factors in the greenhouse which is temperature , humidity , co2 and illuminance , and this system have offered the good growth condition for the crop is grown rapidly , high - quality , high yield 实验研究表明：本系统具有一定的测控精度，系统根据作物生长的需要，实现了温室内温度、湿度、 co _ 2和光照度四种主要环境因子变化的自动调节，为作物速生、优质、高产提供了良好的生长条件。
