High-Resolution Two-Degree-of-Freedom Displacement Measurement Based on Fiber Fabry–Perot Interferometer and Pound–Drever–Hall Technique

Wu, Junhui; Xu, Zhilin; Zhang, Yixiang; Liang, Yurong; Sun, Qizhen; Zhou, Zebing

doi:10.1109/jsen.2023.3282676

Cited by 4 publications

(2 citation statements)

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“…Fabry–Pérot interferometers are very well suited to measure the displacement of the mechanical resonator’s test mass with high precision [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. In our case, we used two optical fibers cleaved to a near-zero-degree angle.…”

Section: Low-finesse Micro-optical Cavity Displacement Sensormentioning

confidence: 99%

“…The latter measures the resonator’s motion, which is converted to acceleration using the resonator’s transfer function. An attractive displacement measurement method due to its excellent performance and simplicity is the use of fiber-based optical cavities [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. In the configuration used here, the fiber ends are used as mirrors to create a low-finesse micro-cavity between the resonator’s test mass and frame.…”

Section: Introductionmentioning

confidence: 99%

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1/f Noise Mitigation in an Opto-Mechanical Sensor with a Fabry–Pérot Interferometer

Nelson,

Sanjuan,

Guzmán

2024

Sensors

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Low-frequency and 1/f noise are common measurement limitations that arise in a variety of physical processes. Mitigation methods for these noises are dependent on their source. Here, we present a method for removing 1/f noise of optical origin using a micro-cavity Fabry–Pérot (FP) interferometer. A mechanical modulation of the FP cavity length was applied to a previously studied opto-mechanical sensor. It effectively mimics an up-conversion of the laser frequency, shifting signals to a region where lower white-noise sources dominate and 1/f noise is not present. Demodulation of this signal shifts the results back to the desired frequency range of observation with the reduced noise floor of the higher frequencies. This method was found to improve sensitivities by nearly two orders of magnitude at 1 Hz and eliminated 1/f noise in the range from 1 Hz to 4 kHz. A mathematical model for low-finesse FP cavities is presented to support these results. This study suggests a relatively simple and efficient method for 1/f noise suppression and improving the device sensitivity of systems with an FP interferometer readout.

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