ГЭТ 22-2014 (НИО 251)

Standard name:

ГЭТ 22-2014 State primary standard unit plan (next – ГЭТ 22-2014).

Type of measurement:

Measurements of geometric quantities.

Structural division: name НИО\НИЛ:

Research Department of Geometric Measurements.

Guardian Scientist:

Chekirda Konstantin Vladimirovich, candidate of technical sciences.

Year of creation:

1980.

Year of re-confirmation:

2015.

Operating principle:

The unit of plane angle is reproduced by:
- Interference examiner (in the small-angle region) in static mode according to an expression that depends on the wavelength of the laser radiation and the pixel size of the examiner's camera (traceability to the State Primary Standard of the unit of length - the meter GET 2-2021 is ensured ГЭТ 2-2021),
- Angle measuring stand in dynamic mode using the reading method from the angular scale of an optical angle converter.
From the examiner, the plane angle unit is transmitted to the autocollimators, which, together with the rotary table, transmit the unit to the polyhedral prisms. From the angle measuring stand, the plane angle unit is transmitted to the angle measuring transducers.

Composition of the standard:

Interference examiner, No. 01-2014;
Digital autocollimator, No. VNIIM01;
Digital autocollimator, No. VNIIM02;
Digital autocollimator, No. VNIIM03;
24-sided prism, No. 13;
72-sided prism, No. 1;
Measuring rotary table, No. 01-2013;
Angle measuring complex, No. 01-2014;
Angle measuring stand, No. 01-2013.

Verification diagram:

Heads the State Verification Scheme for Plane Angle Measuring Instruments, approved by Order of Rosstandart dated November 26, 2018 No. 2482.

Scope of application:

Fundamental and applied scientific research, the most important branches of national industry – aerospace, energy, shipbuilding, defense and mechanical engineering.

Results of applying the standard:

ГЭТ 22-2014 provides reproduction of the plane angle unit in static mode in the range from 0 to 15" with an unexcluded systematic error of 0.0006" and a standard deviation of 0.005", and in dynamic mode in the range from 0 to 360° with an unexcluded systematic error of 0.021" and a standard deviation of 0.01".

ГЭТ 22-2014 ensures the presence of the Russian Federation in the international database of measuring and calibration capabilities of the International Bureau of Weights and Measures.

The transfer of the unit of plane angle to the State secondary and working standards in accordance with the State verification scheme has been ensured.

The total number of measuring instruments traceable to ГЭТ 22-2014:

Hundreds of thousands.

Ensuring the uniformity of measurements, participation in the CIPM MRA program:

3

Unique technical installations as part of the standard:

ГЭТ 22-2014 includes unique installations developed by the staff of the Geometric Measurements Department of the D.I. Mendeleyev All-Russian Scientific Research Institute of Metrology:

An interference examiner based on a modified multi-beam reflecting Fizeau interferometer;
Angle measuring stand operating in dynamic mode, based on an optical angle converter and a ring laser.

PHOTO:

Angle measuring complex
72-faceted prism
24-sided prism
Stand (dynamics)
Table + autocollimators
Examiner

Information in the Federal State Information System "ARSHIN"