An all-metal double metal diaphragm-based optical fiber accelerometer with low transverse sensitivity is proposed and experimentally demonstrated. The theoretical analysis is given based on the electro-mechanical theory. Finite element modal analysis shows that the proposed accelerometer has low transverse sensitivity. Calibration results show that axis responsivity is 41 dB (re: 0 dB = 1 rad/g) with a fluctuation ± 2 dB in frequency bandwidth of 5-400 Hz. The transverse sensitivity is ∼3 dB (re: 0 dB= 1 rad/g) with a fluctuation ± 1.5 dB. A transverse sensitivity of about −40 dB is achieved. The fluctuation of the acceleration responsivity for the three accelerometers is within ± 2.5 dB, which shows good consistency of the proposed accelerometer. The minimum phase demodulation detection accuracy of the phase-generated carrier is 10 −5 rad/Hz 1/2 , and the minimum detectable acceleration can be 90 ng/Hz 1/2 theoretically. With an all-metal structure, the proposed accelerometer is expected to improve the reliability of long-term use in harsh environment. These desirable features show that the proposed optical fiber accelerometer is promising for seismic wave monitoring in oil and gas exploration.
No abstract
A robust cantilever-based push-pull 3-component (3-C) optical fiber accelerometer is proposed and experimentally demonstrated. Sensitivity and resonance frequency can be enhanced simultaneously by increasing the number of turns of an optical fiber without increasing the accelerometer size at the mass of a certain value. The calibration results show that axis sensitivity is 45 dB (re: 0 dB = 1 rad/g), with a fluctuation less than 0.9 dB in a frequency bandwidth of 10-450 Hz. The cross sensitivity is approximately 15 dB, with a fluctuation less than 1.2 dB in a frequency bandwidth of 10-450 Hz. The crosstalk reaches up to 30 dB. Fluctuation of the responses of the acceleration sensitivity of different components is less than 0.7 dB over a frequency bandwidth of 10 -450 Hz, which proves the good consistency of the 3-C optical fiber accelerometer. By usingan all-metal structure is expected to improve the reliability of the designed accelerometer for long-term use in harsh environments. These desirable features show that the proposed 3-C optical fiber accelerometer is satisfactory for seismic wave monitoringin oil and gas exploration.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.