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High-speed and high-sensitivity displacement measurement with phase-locked low-coherence interferometry
Lazo M Manojlović1, Miloš B Zivanov, Miloš P Slankamenac
1Zrenjanin Technical College, Đorđa Stratimirovića 23, 23000 Zrenjanin, Serbia. lazo.manojlovic@vts‐zr.edu.rs
Applied Optics
|July 10, 2012
Summary
A new fiber-optic sensing system achieves high-speed, high-sensitivity displacement measurements using phase-locked low-coherence interferometry. This novel approach significantly enhances measurement speed compared to existing methods.
Area of Science:
- Optics and Photonics
- Metrology
- Fiber Optic Sensing
Background:
- Phase-locked interferometry is crucial for precise displacement measurements.
- Standard systems often face limitations in speed due to phase modulation and lock-in amplification.
Purpose of the Study:
- To develop a novel high-speed and high-sensitivity displacement measurement sensing system.
- To overcome the speed limitations of conventional phase-locked interferometric systems.
Main Methods:
- Utilized a Michelson fiber-optic interferometer.
- Employed a 3x3 fused silica fiber-optic directional coupler to obtain quadrature signals.
- Avoided interferometer phase modulation and lock-in amplification.
Main Results:
- Achieved significantly increased measurement speed compared to standard systems.
- Demonstrated a bandwidth limited to 4.6 kHz by the piezo actuator's resonance frequency.
- Estimated noise floor for displacement measurement is approximately 180 pm/√Hz.
Conclusions:
- The developed system offers a substantial advancement in high-speed, high-sensitivity displacement sensing.
- The novel method using a 3x3 coupler provides a faster alternative for interferometric measurements.
- The system's performance metrics indicate its potential for advanced metrology applications.
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