Abstract: For the requirements of the sight line alteration detection of the combined sight adding a shimmer lens group to the white sight, a high-precision measurement method can be used to measure the true sight line alteration of combined sight as well as the optic axis variation of shimmer lens group. In the method, a CCD camera is used to measure the total sight line alteration，and the errors caused by assembling the combined sight and the attitude change of adjusting bracket caused by assembling the shimmer lens group are quantitatively measured using a dual-auto-collimator, which are eliminated from the measured values to get a true sight line alteration. A theoretical detection model is presented, and the measuring experiment is made. The results show that the measured value of sight line alteration σ is less than 2.16″(0.01 mil); the measured value of the optic axis variation of shimmer lens group σ is less than 21.6″(0.1 mil).

Key words: ordnance science and technology, combined sight, sight line alteration, dual-auto-collimator