Method for discriminating error source of angular instrument

Abstract

The invention discloses a method for discriminating an error source of an angular instrument, which belongs to the technical field of precision instrument measurements. The method comprises the following steps of: using two 0.2'' self-alignment light tubes to perform mutual opposite aiming so as to establish a reference line of which an error is less than 1''; fixing a plane mirror on a turntableof the angular instrument; rotating the turntable of the angular instrument, performing self alignments on the two light tubes by using the plane mirror respectively, and recording read numbers of a coder of the angular instrument; observing the conditions when angular difference values of the coder of the two alignments deviate 180 degrees, and if the measured deviation values are within a tolerance deviation according to overall accuracy allocation requirements of the angular instrument, discriminating the error source influencing the measurement accuracy is an optical sighting system; and if the measured deviation values are not with the tolerance deviation according to the overall accuracy allocation requirements of the angular instrument, discriminating the error source influencing the measurement accuracy is an axis or the coder. The method for discriminating the error source of the angular instrument can accurately and effectively judge the error source influencing the measurement accuracy, and can be used as a method for process inspections of parts of the angular instrument such as a transit instrument and the like.

Description

technical field [0001] The invention is mainly applied in the field of photoelectric measurement, belongs to the technical field of precision instrument measurement, and relates to a method for discriminating error sources of angle measuring instruments. Background technique [0002] With the development and application of angle measuring instruments in the fields of national defense, military industry, aviation and aerospace, the requirements for measuring accuracy of angle measuring instruments are getting higher and higher. In order to ensure the measurement accuracy of the goniometer, it has become a very important link to accurately determine the source of the error when the measurement accuracy is out of tolerance during installation and use. When doing absolute calibration of a sub-nanometer high-precision point diffraction interferometer, it is necessary to accurately rotate the measured optical element to collect the interferogram, and the method of identifying the ...

AI Technical Summary

Problems solved by technology

After the assembly and adjustment of each component is qualified, or after the goniometer has been used for a period of time, the measurement accuracy of the instrument may not meet the measurement requirements. Because there are many components and factors that affect the accuracy, sometimes it is relatively difficult to judge which component accuracy does not meet the requirements.