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- Title
Sinusoidal Phase-Modulated Angle Interferometer for Angular Vibration Measurement.
- Authors
Wang, Xianfan; Yang, Jianhua; Chen, Meng; Miao, Lijun; Huang, Tengchao
- Abstract
Primary angular vibration calibration devices based on laser interferometers play a crucial role in evaluating the dynamic performance of inertial sensing devices. Here, we propose a sinusoidal phase-modulated angle interferometer (SPMAI) to realize angular vibration measurements over a frequency range of 1–1000 Hz, in which the sinusoidal measurement retro-reflector (SMR) and the phase generation carrier (PGC) demodulation algorithm are adopted to track the dynamic angle variation. A comprehensive theoretical analysis is presented to reveal the relationship between demodulation performance of the SPMAI and several factors, such as phase modulation depth, carrier phase delay and sampling frequency. Both the simulated and experimental results demonstrate that the proposed SPMAI can achieve an angular vibration measurement with amplitude of sub-arcsecond under given parameters. Using the proposed SPMAI, the frequency bandwidth of an interferometric fiber-optic gyroscope (IFOG) is successfully determined to be 848 Hz.
- Subjects
VIBRATION measurements; ANGULAR measurements; PHASE modulation; INTERFEROMETERS
- Publication
Sensors (14248220), 2021, Vol 21, Issue 18, p6295
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s21186295