Abstract: An electronic subdivision reading method is proposed to improve the resolution and accuracy of zero testing instrument for day and night sights of small arms. The alignment readings are compensated by simulating an infinity target with the built-in flat glass collimator and adjusting the two pieces of flat glasses which are in horizontal and pitch dimensions, respectively, to offset the infinity target image. Two high-resolution angular displacement sensors are used to measure the deflection angles of the flat glasses in two dimensions, the measured angle values are digitally processed by using the microcontroller and displayed on an organic light-emitting diode (OLED) display, and the image on OLED is coupled to the collimated light path through a coupling prism. A theoretical model of measurement is established, and the measured results are calibrated using high precision photoelectric theodolite. The result shows that the resolution of the method is up to 0.001 mil and the error is less than 0.03 mil. Compared with the traditional mechanical subdivision reading method, the resolution and measuring accuracy of the proposed method are improved significantly. Key

Key words: ordnancescienceandtechnology, zeromomentum, angulardisplacementsensor, organiclight-emittingdiodedisplay