Rearch On Digital White-light Zero-position Meter

The white light sight is the aiming device that assists the gun to shoot accurately.Its aiming baseline refers to the connection between the objective lens node of the sight and the center of the reticle,which determines the direction of the optical axis of the sight.The magnitude of the variable is an important parameter to measure the stability of the sight,so it is necessary to detect it.The zero-position meter method is widely used because of its convenient operation,low cost and easy to carry.The traditional zero-position meter is a collimater,which has the function of reading and the image of its reticle can be moved.When the plate glass deflects in the convergent light path,the incident light will be offset,the reticle image of the collimater can be moved in a small range.However,the machining and adjustment of mechanical parts are complicated,the reading efficiency is low,and there are some problems such as empty return and stroke error in the process of operation.This paper proposes a digital white light zero-position meter.On the basis of the original measurement model,the complex mechanical subdivision reading mechanism is abandoned and a pair of angle sensors are used to measure the compensation deflection angle of flat glass in horizontal and vertical direction.The measured angle value is transmitted to the single chip microcomputer,and the angle increment value measured before and after the experiment is converted into the change of the aiming baseline through software programming,and it is displayed by OLED.A cubic prism is placed in the collimating path,the OLED is placed in the conjugate position with the reticle.The aim target and the displayed data are imaged on the reticle of the sight together,the change can be read directly at the same time of the micro-motion alignment.The paper includes the selection and optimization of the optical system parameters and structure of the instrument,the structural design of the objective set,the reticle,the cubic prism,etc.Using the screw pair to coordinate the connecting rod to realize the micro-adjustment of the micro-motion.The sensor,OLED and other components are designed and selected.After completing the whole loading,the precision is 2" photoelectric theodolite to detect and calibrate the zero-position meter,its uncertainty is analyzed.The results show that the resolution can reach 0.01 mil and the uncertainty of measurement is less than 0.05 mil.