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GB/T 47121-2026Optical gyroscope angle measuring instruments (English PDF)

光学陀螺测角仪

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

January 28, 2026

Implementation date

August 1, 2026

Scope

GB/T 47121-2026 is the English-translated version of 光学陀螺测角仪.

GB/T 47121-2026 is the Chinese standard "Optical gyroscope angle measuring instruments". Its scope clause reads: This document defines the terminology and definitions of optical gyro angle measuring instruments, and specifies the types and basic parameters, technical requirements, inspection conditions, markings, and...

The packaging describes the inspection methods, etc. This document applies to the design, manufacture, and inspection of optical gyroscope goniometers with accuracy classes 1, 2, and 3.

Note. Accuracy levels are classified according to angular position measurement error, with Level 1 having an angular position measurement error of ±0.2" and Level 2 having an angular position measurement error of ±1".

The angular position measurement error for level 3 is within ±5". Its clauses include terms and definitions.

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Document preview — GB/T 47121-2026

National Standard of the People's Republic of China

ICS: 17.040.30
Classification: J 42

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Types and Basic Parameters
5.Technical Requirements
6.Inspection conditions
7.Test methods 6.
8.Marking and Packaging
Appendix A (Normative) Environmental Requirements for Goniometer Use
References

1 Scope

This document defines the terminology and definitions of optical gyro angle measuring instruments, and specifies the types and basic parameters, technical requirements, inspection conditions, markings, and...

The packaging describes the inspection methods, etc.

This document applies to the design, manufacture, and inspection of optical gyroscope goniometers with accuracy classes 1, 2, and 3.

The angular position measurement error for level 3 is within ±5".

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 17163 Basic Terminology for Geometric Measuring Instruments

GB/T 17164 Terminology for Geometric Measuring Instruments - Product Terminology

3 Terms and Definitions

The terms and definitions defined in GB/T 17163 and GB/T 17164, as well as the following terms and definitions, apply to this document.

3.1 Sagnace effect

The optical path difference effect caused by the rotation of the optical path between two coherent light waves propagating in opposite directions along a closed optical path.

[Source. GB/T 45570-2025, 3.1]

3.2

Based on the Sagnac effect, a circular optical path is constructed and the optical path difference between the clockwise and counterclockwise light paths is detected during the rotation process to achieve the cyclic rotation.

An angle measuring instrument for dynamic parameter measurement.

Note 1.Hereinafter referred to as goniometer.

Note 2.Angle measuring instruments are classified into three types according to their functions. static measurement angle measuring instruments, dynamic measurement angle measuring instruments, and hybrid measurement angle measuring instruments.

3.3

The plane containing the optical loop of the goniometer.

Note. The output of an optical gyroscope is at its maximum when there is a certain amount of angular displacement change on this plane.

3.4 Reference condition

The working state of the goniometer when the rotation axis points to the vertical direction and the rotation speed is set to 60°/s.

3.5 zeropositiondrift

With the gyroscope's sensitive surface normal pointing in the vertical direction and the instrument stationary relative to the ground, the angle position measured continuously for 1 hour is relative to the initial value.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.

Referenced standards

Normative references

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