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Sinusoidal Phase-Modulated Angle Interferometer for Angular Vibration Measurement.

Xianfan Wang1, Jianhua Yang1, Meng Chen1

  • 1State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, No. 38, Zheda Road, Hangzhou 310027, China.

Sensors (Basel, Switzerland)
|September 28, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel sinusoidal phase-modulated angle interferometer (SPMAI) for precise angular vibration calibration. The SPMAI achieves sub-arcsecond accuracy, enabling detailed dynamic performance evaluation of inertial sensing devices.

Keywords:
PGC demodulationSPMAIangular vibration calibration

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Area of Science:

  • Metrology
  • Optical Engineering
  • Inertial Sensing

Background:

  • Laser interferometers are vital for calibrating angular vibration in inertial sensing devices.
  • Accurate dynamic performance evaluation requires precise angular measurement capabilities.

Purpose of the Study:

  • To propose and validate a sinusoidal phase-modulated angle interferometer (SPMAI) for angular vibration measurements.
  • To analyze the factors influencing SPMAI demodulation performance.
  • To determine the frequency bandwidth of an interferometric fiber-optic gyroscope (IFOG).

Main Methods:

  • Development of a sinusoidal phase-modulated angle interferometer (SPMAI).
  • Utilizing a sinusoidal measurement retro-reflector (SMR) and phase generation carrier (PGC) demodulation algorithm.
  • Comprehensive theoretical analysis of demodulation performance factors (modulation depth, carrier phase delay, sampling frequency).
  • Simulated and experimental validation of the SPMAI system.

Main Results:

  • The SPMAI achieves angular vibration measurement with amplitude of sub-arcsecond.
  • Theoretical analysis reveals key relationships affecting demodulation performance.
  • The frequency bandwidth of an interferometric fiber-optic gyroscope (IFOG) was successfully determined to be 848 Hz.

Conclusions:

  • The proposed SPMAI is an effective tool for high-precision angular vibration calibration.
  • The SPMAI system demonstrates potential for accurate dynamic performance evaluation of inertial sensors.
  • This method provides a reliable approach for determining the frequency bandwidth of devices like IFOGs.