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A dynamic angle metrology system based on fibre-optic gyroscope and rotary table

100%

Chen L. , Zhou Y. , Zhang D. , Shu X. , Liu C.

Metrology and Measurement Systems

2019

tom Vol. 26, nr 3

497--504

Dynamic angle measurement (DAM) plays an important role in precision machining, aerospace, military and artificial intelligence. Because of its advantages including high sensitivity, solid state and miniaturization, fibre-optic gyroscope (FOG) has great application prospects in the field of DAM. In this paper, we propose a dynamic angle metrology method based on FOG and a rotary table to evaluate the DAM accuracy with FOG. The system synchronously collects data from the FOG and rotary table, and analyses the DAM accuracy of the FOG for different sway conditions compared with that of the angle obtained from the rotary table. An angle encoder in the rotary table provides absolute or incremental angular displacement output with angular displacement measurement accuracy of 10′′ (0:0028°) and angular displacement repeat positioning accuracy of 3′′ (0:00083°), and can be used as an angle reference. The experimental results show that the DAM accuracy of the FOG is better than 0:0028° obtained with the angular encoder, and the absolute DAM accuracy of the FOG is better than 0:0048° for given conditions. At the same time, for the multi-path signal synchronization problem in the metrology field, this paper proposes a signal delay measurement method combining test and algorithm procedures, which can control a delay within 25 μs.

A dynamic angle metrology system based on fibre-optic gyroscope and rotary table

100%

Chen L. , Zhou Y. , Zhang D. , Shu X. , Liu C. , Chen L. , Zhou Y. , Zhang D. , Shu X. , Liu C.

Self-noise reduction in a FOG-based rotational seismometer confirmed by Allan variance analysis

75%

Zając P. , Amrozik P. , Kiełbik R. , Maj C. , Szermer M. , Starzak Ł. , Pękosławski B. , Jabłoński G. , Tylman W. , Kurzych A. , Jaroszewicz L. R.

Opto-Electronics Review

2024

tom Vol. 32, No. 4

art. no. e152766

Reducing noise in fibre-optic gyroscope (FOG)-based rotational seismometers is crucial in guaranteeing their applicability as future high-precision sensors. This paper presents a practical approach to noise analysis of a designed and manufactured FOG-based three-axis rotational seismometer. The performed measurements show that proper identification of noise sources and subsequent changes to the device’s configuration which addressed these noise issues, visibly improved the Allan deviation plot of the device. In particular, angle random walk was reduced from 100–200 to around 35 nrad/s/√Hz and bias instability – from several dozens down to single nrad/s. These improvements were achieved only by elimination or mitigation of the impact of all noise sources, without changing any optoelectronic components of the constructed device and without applying any additional post-processing methods.