Study on measurement of sight-line alteration of high precision sighting telescopes

In order to solve the difficulty of the performance testing of high precision sighting telescope,i.e.,testing its sight-line alteration under various environmental test conditions,a test system was designed based on CCD image test technology.Firstly,the position difference of the anchor was measured through measuring the positions of the connection seat anchor points before and after test.Secondly,according to this data,the fixing base of the precision sighting telescope was adjusted to make the connection seat anchor recover to the initial position.Finally,the alteration of the sight-line was measured and figured out.Based on an optical collimator,the focal length of the CCD optical system was measured and the system accuracy was analyzed.Inpractical engineering applications,the measurement error was less than 2.16" and measuring range was larger than 4320",which met the project requirements.The results show that the test method is accurate and reliable and detection precision is high.This test system offers a method for testing the sight-line alteration of high precision sighting telescopes.