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本文所讲述的相机是为获得最大的灵敏度和1弧秒的测量精度而设计的。光学系统是由一个630毫米直径的简单的非球面校正板和800毫米孔径的球面反射镜组成的施密特(Schmidt)型系统。此系统将来自离系统光轴10°范围以内的物体的全部光线反射到成像圆内。反射镜用径向和轴向的配重系统平衡。在照相底板前方装有一个平像埸透镜。使用两个快门。一个膜片式快门,位于光学系统的孔径处,用于恒星曝光的定时。一个靠近焦面的转动扇形快门产生卫星光迹的定时间隔。这种间隔的时间可达0.1毫秒,精度为±0.1毫秒。定时系统是一个由1兆周的晶体管振荡器和与之相连接的电路所推动的石英钟。恒星校正曝光是在卫星通过相机视埸之前和之后进行的。本文还讲述了系统精度的试验和用于一个测地卫星的情况。
The camera described in this article is designed for maximum sensitivity and 1 arcsecond measurement accuracy. The optical system is a Schmidt-type system consisting of a 630 mm diameter simple aspheric correction plate and an 800 mm aperture spherical mirror. The system reflects all light from objects within 10 ° of the optical axis of the system into the imaging circle. The mirror is balanced with a radial and axial counterweight system. In front of the camera is equipped with a flat lens 埸 lens. Use two shutters. A diaphragm shutter located at the aperture of the optical system for timing the star exposure. A rotating sector shutter near the focal plane produces satellite light trails at regular intervals. This interval can be up to 0.1 milliseconds with an accuracy of ± 0.1 milliseconds. The timing system is a quartz clock driven by a trillion-channel transistor oscillator and its associated circuitry. Stellar correction Exposure is made before and after the satellite passes the camera. This article also describes the system accuracy test and for a geodetic satellite.