在低放大率的情况下，扩展光源往往显得更亮一些。
Extended objects will always appear brighter at lower magnifications.
图显示出，一条来自于扩展光源A点的光线。
The figure shows the path of one ray from a point A of an extended source.
要记住，扩展光源上各个点之间彼此都是不相干的。
Keep in mind that each source point on the extended source is incoherent with respect to the others.
当观察扩展光源时，目镜中所看到的亮度只跟孔径和放大率有关，它跟焦比并没有关系。
When viewing extended objects, the apparent brightness seen in the eyepiece is a function only of aperture and magnification, it is not related to focal ratio.
因此，需要在设计中结合系统信噪比的要求，选取合适尺寸的扩展光源。
Therefore, a suitable size of extended light source can be chosen, considering the requirement of SNR in the optical design.
分析表明，扩展光源存在的立体角导致系统的相干长度变短，光谱分辨率降低。
It was found that the coherent length became shorter and the spectrum resolving power became lower as a result of solid Angle produced by the extended light source.
在实际工作中，不是用点光源而是用一个扩展光源加一个台下聚光镜以得到一个较亮的象。
In actual practice a brighter image is obtained by using a broad, rather than a point, source along with a substage condenser.
该文应用傅里叶光学原理对扩展光源照明下光栅的成象特性作了分析，并由此设计出一种新型的光栅成象型位移传感器。
Basedg on Fourier optical principle, the imaging property of grating illuminated by expansion source is analysed in this paper. Hence an innovative grating imaging displacement sensor is designed.
不过火星比遥远的恒星距离我们更近，光源也更为扩展。
But Mars is much closer than the distant stars and an extended source of light.
许多人常常把焦比和图像亮度等同。其实严格来说，只有当观察月亮和星云等“扩展”光源(译者注：与点光源相对，可以理解为面光源)的时候，上述说法才是正确的。
Many people equate focal ratios with image brightness, but strictly speaking this is only true when taking pictures of "extended" objects like the Moon and nebulae.
扩展面光源如太阳光与激光光源有明显的差异，因此它们照射到随机粗糙柱面后的散射特性也不同。
Because of obvious difference between expanding light source and laser source, it appears different scattering peculiarity while they project to a random rough cylinder.
我们现在手头有五台机器，所以我们可以做一些扩展性的使用测试来看看混合光源投影机在长时间使用下是否依然保证其亮度和色彩的特点。
Since we have had a total of five units in house, we've been able to do some extended usage testing to see if the Hybrid light engine maintains its brightness and color characteristics over time.
随着激光光源频率范围的不断扩展，光探测手段的不断丰富，拉曼光谱的检测灵敏度获得了极大的提高；
With the expansion of frequency range of modern laser and the enrichment of light detection method, sensitivity of Raman spectrum has made great progress.
在另一种技术中，将光源层的点扩展函数分解成多个分量，并对每个分量确定一个有效亮度模式。
In another technique, the light source layer's point spread function is decomposed into a plurality of components, and an effective luminance pattern is determined for each component.
现在这项技术的应用领域已经逐渐从外层空间扩展到地面，使得太阳模拟器作为实验室可控的光源越来越受到人们关注。
Now, the application of this technology has been extend to ground, and the solar simulator has been popular with people as the controllable source in laboratory.
现在这项技术的应用领域已经逐渐从外层空间扩展到地面，使得太阳模拟器作为实验室可控的光源越来越受到人们关注。
Now, the application of this technology has been extend to ground, and the solar simulator has been popular with people as the controllable source in laboratory.
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