Frequency-domain displacement sensing with a fiber ring-resonator containing a variable gap
Citation
F. Vollmer and P. Fischer, "Frequency-domain displacement sensing with a fiber ring-resonator containing a variable gap," Sensors and Actuators A: Physical, 134, 410–413 (2007), doi:10.1016/j.sna.2006.06.022.
Keywords
- Ring-resonator
- Optical fiber
- Displacement sensing
- Optical resonance
- Frequency-domain
- Variable gap
- Non-contact measurement
- Nanometer sensitivity
- Resonance frequency shift
- Tunable laser
- Fiber loop
- Optical circulator (mentioned as a possible geometry)
- Sub-wavelength displacement
- Finesse
- Transmission spectrum
- Piezoelectric actuators
Brief
This article demonstrates a novel method for strain-free (non-contact) displacement measurements with nanometer sensitivity by introducing a variable gap in a fiber ring-resonator and tracking the resulting shifts in its resonance frequencies.
Summary
This paper demonstrates a novel, strain-free method for displacement sensing by introducing a variable gap in a fiber ring-resonator and measuring the resulting shifts in resonance frequencies. This technique achieves nanometer sensitivity, as shown by measuring sub-wavelength displacements of ~10 nm with a ~0.63 m fiber loop. The authors suggest that miniaturizing the resonator could lead to even higher sensitivity, potentially reaching sub-nanometer resolution. The method offers a non-contact approach for displacement measurements in the frequency domain.
Origin: https://sci.bban.top/pdf/10.1016/j.sna.2006.06.022.pdf#