High-performance accelerometer array with chirped pulse modulation using reference interferometric architecture.
Optics Express
|June 14, 2025
View abstract on PubMed
Summary
This study presents a novel optical fiber disk accelerometer using chirped pulse demodulation for precise acceleration measurement. The system achieves superior performance with enhanced signal-to-noise ratio and expanded dynamic range, improving accuracy and noise suppression.
Area of Science:
- • Optical Engineering
- • Sensor Technology
- • Signal Processing
Background:
- • Limitations in current accelerometer technology include noise and limited dynamic range.
- • Optical fiber sensors offer potential for high-precision measurements but require advanced signal processing.
- • Laser source fluctuations and environmental noise impact accelerometer performance.
Purpose of the Study:
- • To demonstrate a high-performance optical fiber disk accelerometer.
- • To improve acceleration measurement precision and noise suppression.
- • To enhance signal-to-noise ratio (SNR) and dynamic range.
Main Methods:
- • Employed chirped pulse demodulation with a reference interferometer architecture.
- • Utilized matched-filter processing for enhanced SNR and spatial resolution.
- • Implemented a second-order time-domain difference unwrapping (TDU) algorithm.
Main Results:
- • Achieved a sensitivity of 30.97 rad/g over a 5-800 Hz bandwidth.
- • Demonstrated 12.84 dB phase noise reduction in the 1-20 Hz range.
- • Exhibited a high-frequency noise floor of -105 dB re g²/Hz, outperforming IQ demodulation by 15 dB.
- • Expanded dynamic range from 85.93 dB to 106.59 dB using the TDU algorithm.
Conclusions:
- • The proposed optical fiber accelerometer with chirped pulse demodulation offers high precision and effective noise suppression.
- • The system demonstrates superior performance metrics compared to conventional methods.
- • The enhanced dynamic range facilitates distortion-free acceleration detection across extended spectral bandwidths.
