介绍了所设计的一种大量程无透镜光电式垂线坐标仪的测量原理、测量电路及测量过程,并通过试验证明了该仪器的可靠性和稳定行。仪器采用线阵点光源提供光照,无需透镜,光源布置简单,易于实现,解决了在潮湿环境中镜头发霉的问题,增加了加热设备,更适合大坝等潮湿环境中应用,可进行现场观测,该垂直坐标仪的量程达到100mm。 The measuring principle, measuring circuit and measuring process of a large-scale lensless photoelectric vertical coordinate system designed are introduced. The reliability and stability of the instrument are proved through experiments. The instrument adopts the point array light source to provide illumination without lens and the light source is simple to be arranged and is easy to be realized. The utility model solves the problem of moldy lens in humid environment, increases heating equipment and is more suitable for damp environment application such as dams, The vertical coordinate range up to 100mm.