It is proved that it has many attractive features ( 1 ) its applicable spectral range is broad , many liquid crystals have very large birefringence and good transparency in both near ultraviolet band , visible band and infrared band 本文重点研究了可调谐液晶电光滤光片，它的主要优点有： 1 、可应用的光谱范围特别宽。许多液晶在紫外、可见光、红外都具有较大的双折射率和良好的透射性。
An ideal choice for many lighting applications including photography , warning beacons , reprographics , and pump sources for solid state lasers , perkinelmers flashlamps provide high brightness , long life and high efficiency with a spectral output range covering the uv through the ir . our flashlamps operate at extremely high energy levels and exceptionally high repetition rates Perkinelmer照明解决方案提供的输出功率覆盖了从紫外光到红外光的整个光谱范围,对下列各种多样照明场合都不失为一种理想选择:摄影,电视投影,美容,医学,工业包括闪光灯,警示灯塔,与镭射切割等等perkinelmer optoelectronics为全球相机市场提供高效率的小内径闪光灯及反光灯设计
It is difficult to get the car plate picture . while , at the same time , we use a more powerful light in a limited range of spectrum to head on the car light , basing on the technology of the selecting and use a filter to filter the unnecessary light , we can get the clear car picture 如果，在拍摄车牌图像的同时，用一特定光谱范围内，辐射功率大于车灯辐射功率的光源，向车牌方向照射，利用光谱的选通技术，通过摄像机端的滤光片滤去车灯发出的不需要的辐射，摄像机就可以拍摄到的较为清晰的车牌图像了。
According to the current problems such as low quantum efficiency . limited available sun energy spectrum range , and inefficient recovery , resulted from the practical using of photocatalysis , using the narrowband semiconductor cds ( eg = 2 . 5ev ) to compound with tio2 seems to be an effective solution . since it will not only enlarge the region of the absorption with the proper narrow band of cds but also improve the photodegradation efficiency on account of the band overlap of the two , which makes the photo induced electron and holes separate more easily 本文针对光催化技术应用中存在的tio _ 2光催化量子效率低，吸收利用太阳能光谱范围有限，催化剂回收困难等问题，通过窄禁带半导体cds ( e = 2 . 5ev )的复合，对纳米tio _ 2进行了改性研究，一方面，由于cds的窄禁带宽度可以扩展薄膜的光谱吸收范围，另一方面，由于能带的交叠，提高了光生电子和空穴的分离效率，从而提高了薄膜的光催化降解效率。
This paper describes a new method to select these parameters , including to determine the focus length , relative aperture and field of view of new optical system in design by means of making reference to previous star sensors and their optical systems ; to forecast the acquiring probobility of star sensor in accordance with selected param eters ; to determine the principal design wavelength and spectral coverage by means of integrat ing the spectrum of stars 本文介绍一种确定光学系统参数的新方法，包括通过参考比较已有星敏感器及其光学系统特性来选取新光学系统焦距、相对孔径和视场；根据所选取的参数预计星敏感器的捕获概率；采用综合恒星光谱方法确定光学系统中心波长和光谱范围。
In order to realize the measurement of several parameters and broad - band spectrum ( 250nm ~ 3000nm ) on the same standard equipment , we make use of two main light paths . one is to measure spectral radiance , the other is to measure irradiance through integral sphere , translational stage and mirror changing the light path 本标准装置涉及参数多，包括光谱辐照度、光谱辐亮度、光源色温；光谱范围宽，覆盖了紫外、可见、红外；在同一套设备上实现多参数、宽光谱以及能量强度变化为7个数量级的精确测量。
We adopt double alkali cathodal tube 9789qb , which was made by emi corporation in england , as our photomultiplier , whose spectrum ranges between 300nm to 650nm , with less noise counters and single - photon apices , which make it suitable as a single - photon - counter . the disparted - voltage device is designed in a reasonable way and the cooling system of iquefied nitrogen which makes it small in size , simple in structure , easy in processing , cheap in cost and good in performance 该管型的光谱范围在300 650nm ，具有暗计数少，有单光子峰的特点，适于做单光子计数器；本文的光电倍增管分压器设计合理而冷却系统采用液氮，该系统体积小、结构简单、加工便利、成本低廉且性能良好。
