相对孔径

Meanwhile, the larger the relative aperture of the holographic concave grating on aspherical surface is, the more compact the flat-field spectrograph will be.

同时，利用较大相对孔径非球面全息凹面光栅，可使平场光谱仪的结构更紧凑，从而可实现平场光谱仪的小型化。

The relationships between main specifications of the instrument, such as tempe rature measurement accuracy of the instrument, temperature measurement sensitivi ty and temperature measurement range, and technical parameters, such as working wavelength of the instrument, bandwidth of amplifier and relative aperture of op tical system were analyzed.

分析了该系统的测量精度、测温灵敏度及测温范围等主要技术指标与激光源的能量、仪器的工作波长、放大器带宽、光学系统的相对孔径等技术参数间的关系。

A design of a lens, whose operating wavelength is (0.486～0.863)μm, full field-of-view angle is and relative aperture is 1∶7.85, is presented on the basis of the theoretical calculation and the optimization of optical design software ZEMAX.

通过理论分析和ZEMAX光学设计软件的优化，结合工程应用给出了工作波长为（0.486～0.863）μm、全视场，相对孔径为1∶7.85的镜头设计实例，其二级光谱为0.01mm。

A design example of a lens whose operating wavelength is 0.4～0.9μm,focal length is 400 mm,full field-of-view angle is 6.2°and relative aperture is 1:4 is given on the basis of the theoretical calculation and the optimization of optical design software ZEMAX.

通过理论计算和ZEMAX光学设计软件的优化，给出工作波长范围在0.4～0.9μm、焦距为400mm、视场角为6.2°、相对孔径为1∶4的设计实例。设计结果表明，二级光谱得到了很好的校正，像质优良。

A design example of a lens whose operating wavelength was 0.4-0.7μm,full fieldofview angle was 80°and relative aperture was 1∶1.5 was given on the basis of the theoretical calculation and the optimization of optical design software ZEMAX.

通过理论计算和ZEMAX光学设计软件的优化，给出工作波长为0.4～0.7μm、全视场角为80°，相对孔径为1∶1.5的镜头设计实例。

The imaging quality of this lens was evaluated. The results show that it has an excellent imaging quality, at spatial frequency of 42lp/mm, its MTF value is greater than 0.5 for 0.7ω, and it meets all the specifications and requirements of WFOV and large relative aperture for underwater photographic application.

质量评价结果表明：设计的摄影物镜成像质量优异，在空间频率为42lp/mm时0.7ω的MTF值高于0.5，且达到各项性能指标，能够满足水下微光摄影物镜对大视场大相对孔径的需求。

The key to apply CCD to implement mammography is to improve the coupled efficiency of light from scintillation screen to CCD, and it is necessary that the image system has a large relative aperture and adopts close imaging, which makes the CCD image seriously distorted.

为提高由闪烁屏到CCD的光耦合效率，减小大相对孔径和近距离成像造成CCD图像严重失真，提出一种有效补偿图像失真的预处理方法。

With reasonable analysis of optical path, a new type beam expander with wide aperture and bigger field angle and large relative aperture in which the on-axis and off-axis aberration are both perfectly corrected is designed.

通过合理的光路分析，设计出一种轴上和轴外像差都得到很好校正、大口径大相对孔径、视场可增大的、光学性能优于伽里略和开卜勒扩束器的新型扩束器。

Fish eye lens is a kind of reversed telephoto lens having big relative aperture, large view angle and long back working length. Its view angle can reach 180 degree or even more so it can image object covering semisphere or larger than semisphere to limited plane.

鱼眼镜头是一种具有大相对孔径、大视场角和较长的后工作距离的反摄远镜头，它的视场角可以达到甚至超过180°，因此它能够将半球空域甚至超半球空域的物体成象在有限的象平面上。

The capital parameters of the optical system are f′=1 600mm,2ω=18°×0.148°, F/number=F/10,and all surfaces are conicoid.

光学系统的基本参数为：焦距f′=1 600 mm，视场角为2 w=18°×0.148°，相对孔径为1／10，3个反射面均为二次曲面。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了