Abstract: Aiming at the calibration problem of the fixed-length standard composed of two pyramid prisms, a calibration method for the fixed-angle pyramid prism length standard is proposed. A method of direct aiming and quick adjustment of the optical apex of the pyramid prism is adopted to realize the quick aiming and positioning of the optical apex of the pyramid prism. With the three-way laser interference precision length measuring device, a calibration device for the length standard of the pyramid prism is built, and the aiming and calibration accuracy of the pyramid prism length standard is improved.

Key words: Corner cube prism, Length standard, Length calibration