由于在远心系统中最大视场直接关系到镜头的镜头的光圈到物体之间的距离，若需要大的视场就必须要有大尺寸的前置镜头。
Because maximum field of view in telecentric systems directly relates to the lens aperture closest to the object, larger front lenses are necessary for larger fields of view.
开发了一种基于GPRS技术的水量远传系统，阐述了系统的构成原理，详细论述了水量采集终端、GPRS数传终端等系统硬件的设计方法，及数据中心系统软件的设计流程。
It dissertates the principle of water flux transfer system based on GPRS, and expatiates the design method of water flux gather terminal, GPRS data transfer terminal, data center and system software.
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