At the case of excess of nonlinear effects appearance threshold , not only are quality reduction of the wave front passing optical elements and energy losses possible , but also the fatal destruction of optical elements in themselves are the most grievous 当泵浦光强度超过产生非线性效应的阈值时,激光通过谐波转换晶体后,不但光束波前质量将有可能变差,而且还会损失一部分能量,更严重的是光学元件的致命破坏。
According to the features of a greenhouse , adopting can bus and embedded technology , based on intelligent decoupling control algorithm including adaptive fuzzy control , a measurement and control system for intelligent decoupling control to temperature , humidity , light intensity of greenhouse was developed 摘要采用can总线与嵌入式技术,基于自适应模糊控制的智能解耦控制算法,在一定的模型误差范围内实现了对温室环境温度、湿度、光强度的智能解耦控制。
In order to efficiently improve the stability of the apparatus , a dual - optical detection circuit was adopted . to eliminate the multiple scattering effects on transmittance measurements , the range of the transmittance was limited to 70 - 100 % by adjusting the width of the light flow cell and changing the intensity of the incident light through regulating the load voltage of the laser light source . moreover , the data acquisition software was programmed in microsoft visual bas 通过调节激光光源负载电压改变光强度及调摘要整检测池的宽度,消除了多重散射对透光率的影响,将透光率的变化范围控制在满足beer1a毗ert定律的范围内工将温度、溶液密度和透光率信号经模数转换,并用microsoftvisualbasic语言编写的数据采集软件,实现了实验过程中各被测量的自动连续采集。
A new method for measuring the vibration of shadow mask without touch by detecting the light density with reflection type optical fiber sensor is presented . the measurement system based on the new method is designed to make the vibration measurement easier working , faster calculating , and get more precise results . it is an important measurement and analysis tool to improve the performance of shadow mask and display quality of cpt 本文提出了基于单光纤光强度反射法的非接触式微振动测量系统的原理,并设计制造了该测试系统,探索出了简单方便可靠的测量方法,能够准确客观地反映荫罩振动的各项参数(各振动模的振动频率、振幅、衰减时间) ,实现了测试装置的简便化和测试过程的自动化,为cpt张紧式荫罩系统的性能改进与显示质量的提高提供了有效的测试分析手段。
In this research , bright light light intensity : 3000 lux ; exposure time : two hours in the morning and two hours in the evening daily was administered to ten patients who had not been treated with any sedative medication . the experimental results showed that bright light therapy improved the sleep quality and mental stabilization of the patients with acute alcohol withdrawal symptoms 这个实验是以亮光光强度: 3000lux曝露时间:每天早晚各照射2小时给予10位未做镇静治疗的病人,实验结果显示亮光疗法确实能够改善睡眠品质,并对有急性酒精戒断后症候群的病人有神智稳定的作用8 。
On the basis of theories of physics , geometrical optics and photometry , the optical properties of collimated light beam incident upon single fiber perpendicular to the fiber axis are studied . by exploring the behaviors of reflected light and transmitted light from single fiber , the distribution of the light is described and the proportionalities between the intensity of the reflected , transmitted and scatered light are obtained respectively , and the different laws governing the intensity of diffused light and transmitted light from single fiber between near and far field are discussed . experiments demonstrate that the decrease of projecting light in far field is in direct proportion for the increase of fiber diameter , which serves as the theoretical basis for a series optics equations , as well as for the designment for photoelectric deviccs for detecting fibers 结合物理学的基本原理和几何光学的基本规律以及光度学的基础理论等三方面,研究了单纤维在平行均匀光束垂轴入射时的光学性质.分析了单纤维反光和透光的特征,光强分布及反射光、透射光和散射光的相对大小;讨论了在近场和远场条件下,漫反射光和透射光光强的不同规律;通过实验验证了远场时,纤维的漫射光强度与纤维直径成正比的关系
( 2 ) several samples of different structure parameters are grown by low - pressure metal - organic chemical vapor deposition ( lp - mocvd ) . it is found that pl peak intensity , full width at half maximum ( fwhm ) and light output intensity are greatly dependent on number of wells . ratio of well / barrier width nearly has no effect on pl peak intensity and fwhm , but has little relation to light output intensity 通过分析pls ,可以及时获取材料生长和结构设计的数据,对质量控制有重要的指导意义; ( 2 )对不同结构的gainp algainp多量子阱样品进行了光致发光及出光强度的测量,发现mqw的周期数目n对pl峰强度、半峰宽和出光强度的影响最大;阱垒宽厚度比a对pl峰强度和半峰宽的影响较小,但对发光强度的影响较大。
The relation between the photo - voltage , photocurrent of photocell and light intensity measured by photocell is discussed . it can be explained by light - induced scattering that the sppc wave is diffracted in the course of being produced . we utilize cu : knsbn crystal to correct a distorted picture because of its super sppc characteristic 针对掺杂量为1000ppm的cr : sbn晶体,研究了不同的信号光、泵浦光强度比对四波混频相位共轭反射率的影响,并在固定信号光、泵浦光强度的情况下,研究了不同光束夹角对相位共轭反射率的影响。