High-accuracy transient response fiber optic seismic accelerometer using a shock-absorbing ring as a mechanical antiresonator

Yi, Duo; Fei, Liu; Zhang, Min; Tao, Qingchang

doi:10.1364/ol.44.000183

Cited by 14 publications

(2 citation statements)

References 14 publications

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“…Data below 20 Hz frequency was not available due to the limited frequency band of the shaker as well as the relatively high ambient noise. It is worth noting that in our system the damping ratio ξ of the sensor was optimized to ∼0.3 via a proper injection of silicone oil and rubber ring adjustment [24], [25]. This helps in the suppression of the amplitude around the natural frequency (∼1.6 kHz) from ∼67 dB to ∼50 dB compared to the result of non-optimized case (with a damping ratio ξ of ∼0.05) which is shown as the green-dashed curve in Fig.…”

Section: Sensor Performance In Laboratory Environment a Sensitivitymentioning

confidence: 99%

Downhole Microseismic Monitoring Using Time-Division Multiplexed Fiber-Optic Accelerometer Array

et al. 2020

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Microseismic monitoring is of importance for several geoscience research aspects and for applications in oil and gas industry. For signals generated by the ultra-weak microseismic events, conventional moving-coil geophone systems have reached their limit in detection sensitivity especially at high frequency range. Here we for the first time present a specially tailored fiber-optic sensing system targeting at downhole microseismic monitoring. The system contains 30 individual interferometric accelerometers and 2 reference sensors, which are time-division multiplexed into a 12-level vector seismic sensor array. The multiplexed accelerometers can achieve ∼50 ng/ √ Hz noise equivalent acceleration, which is superior to the commercial available moving-coil geophone systems at frequencies above 200 Hz. The measured sensitivity of the accelerometers can reach ∼200 rad/g from 10 Hz to 1 kHz. The dynamic range is above 134 dB over the same frequency range and is higher than its electronic counterpart in the low frequency band. Moreover, the sensors can function properly under the harsh condition of 120 • C temperature and 40 MPa pressure over the 4-hour test duration. The sensor array along with the interrogator has been running uninterruptedly over 3 weeks in a multi-stage hydraulic fracturing stimulation field test. On-site results show that our system can clearly resolve the vector nature of both compressional and shear waves generated by the microseismic events. INDEX TERMS Fiber-optic accelerometer, Seismic sensor, Time-division multiplexing, Microseismic monitoring II. PRINCIPLE OF THE FIBER-OPTIC SEISMIC SENSOR UNIT A. THE SEISMIC SENSOR UNIT This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/ACCESS.2020.3003374, IEEE Access Fei Liu et al.: Downhole microseismic monitoring using time-division multiplexed fiber-optic accelerometer array

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Section: Sensor Performance In Laboratory Environment a Sensitivitymentioning

confidence: 99%

Downhole Microseismic Monitoring Using Time-Division Multiplexed Fiber-Optic Accelerometer Array

et al. 2020

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“…FOAs are suitable for earthquake monitoring [4], building health monitoring [5], and oil exploration [6]. According to its mechanical structure, FOA can be divided into three types: cantilever structure [7]- [9], mandrel structure [10], [11], and diaphragm structure [12]; in particular, fiber optic Fabry-Perot accelerometers (FOFPAs) based on a deflectable…”

Section: Introductionmentioning

confidence: 99%

Fabry-Perot Interferometer Based on an Aluminum-Polyimide Composite Diaphragm Integrated With Mass for Acceleration Sensing

Shi

et al. 2019

IEEE Access

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This study proposes a miniature and highly sensitive Fabry-Perot interferometer (FPI) based on aluminum -polyimide diaphragm integrated with a mass block for acceleration sensing. The composite diaphragms with a radius and thickness of 3.5 mm and 630 nm are manufactured by Micro-Electro-Mechanical System (MEMS) technology. To increase the adhesion of the polyimide diaphragm to silicon wafer and improve the quality of deflectable diaphragm, a 30-nm-thick aluminum diaphragm is first coated on the silicon wafer by magnetron sputtering; a silicon wafer in the intermediate diaphragm is reserved as a mass block to form an integrated structure. Air cavity of the FPI formed by this composite diaphragm is modulated via external vibration signals, leading to a variation in the length of the cavity. Three fiber optic Fabry-Perot accelerometers (FOFPAs) are fabricated with a measured average sensitivity and acceleration resolution of 2.6 V/g (100 Hz-3.2 kHz) and 4.12 µg/Hz 1/2 respectively, which show high consistency and manufacturing reproducibility. Good heat resistance performance of the sensor below 280 • can also be observed obviously. Thus, this proposed sensor is anticipated to have wide application prospects in micro vibration monitoring in high temperature.INDEX TERMS MEMS, aluminum-polyimide diaphragm, Fabry-Perot Interferometer, acceleration sensing.SHILI LI received the B.S. degree from Anhui University, Hefei, China, where she is currently pursuing the M.S. and Ph.D. degrees with the Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education. Her research interests include fiber optic sensing and engineering applications.

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Highly sensitive fiber optic microseismic monitoring system for tunnel rockburst

Wang

et al. 2022

Measurement

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High-accuracy transient response fiber optic seismic accelerometer using a shock-absorbing ring as a mechanical antiresonator

Cited by 14 publications

References 14 publications

Downhole Microseismic Monitoring Using Time-Division Multiplexed Fiber-Optic Accelerometer Array

Downhole Microseismic Monitoring Using Time-Division Multiplexed Fiber-Optic Accelerometer Array

Fabry-Perot Interferometer Based on an Aluminum-Polyimide Composite Diaphragm Integrated With Mass for Acceleration Sensing

Highly sensitive fiber optic microseismic monitoring system for tunnel rockburst

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