综合验光仪检定装置研制

Development of Verification Equipment for Phoropters

为了解决综合验光仪的计量检定,研制了基于自准直清晰度法的综合验光仪球镜度、柱镜度、柱镜轴位、中心误差光电检测系统。该系统采用光栅测长传感器实现凹面反射镜位移的精密测量,采用角度编码器实现目标十字线分划板角位移的传感,使用CCD实现图像采集,利用计算机实现分析及测量。分析了影响测量精度和范围的因素,设计了综合验光仪的光学系统、关键物镜,给出了光电参数,仪器可溯源至顶焦度国家基准。理论分析和实验结果表明,该装置用于检测综合验光仪时球镜顶焦度扩展不确定度可达到(0.03~0.08)m−1(k=2),满足综合验光仪的检定需求。

To solve the verification of the phoropters,optoelectronic equipment for measuring spherical vertex power,cylinder vertex power,axis position,and the center error of refractor heads based on the self-collimation sharpness method was developed.The equipment uses a grating length sensor to achieve precision measurement of concave reflector displacement,an angle encoder to measure the angular of the cross-line reticle,a CCD to achieve image acquisition,and a computer to achieve analysis and measurement.In this paper,the factors affecting the measurement accuracy and range are analyzed,the optical system of the comprehensive optometer and the key objective lens is designed,the photoelectric parameters are given,and the equipment is traceable to the national primary standard of vertex power.Theoretical analysis and experimental results indicate that the expanded uncertainly for phoropters can reach(0.03~0.08)m-1(k=2),which meets the verification demand for the phoropters.