The current state of the reference base of the Russian Federation in the field of length and angle measurements

The current state of the reference base of the Russian Federation in the field of length and angle measurements is presented. The description and main metrological characteristics of the State Primary Standards of the unit of length – meter GET 2-2021 and the unit of plane angle GET 22-2014 are given. The possibilities of D. I. Mendeleyev Institute for Metrology for carrying out calibration, testing for type approval, verification and certification of modern high-precision measuring equipment of length and plane angle, which are based on stabilized laser radiation sources, are described. To this date, the State Primary Standard of the unit of length – meter GET 2-2021 provides transferring of the unit of length to laser radiation sources in the wavelength range from 500 to 1050 nm by the optical frequency comb with hydrogen frequency standard, and laser measuring systems in the range from 1·10–9 to 30 m by the complex of laser interference comparators. The State Primary Standard of the unit of plane angle GET 22-2014 provides transferring of plane angle to such systems in the range from 0 to 360° using a rotary table and digital autocollimators. The necessity of traceability of laser radiation sources and laser measuring systems to State primary standards is substantiated. Further prospects for the development of the reference base in the field of length and angle measurements are considered.

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