Sagnac Vibration Sensing System With Nested Pulse Method

Li, Peihong; Wang, Yu; Liu, Xin; Bai, Qing; Wang, Pengfei; Gao, Yan; Zhang, Hongjuan; Jin, Baoquan

doi:10.1109/jlt.2020.3036160

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…Compared with other sensors, optical fiber sensors have attracted more attention because of their light weight, simple structure, anti-electromagnetic interference and other characteristics. Various types of fiber sensors have been developed for vibration detections based on Fabry-Perot interferometer (FPI) [3][4][5], Mach-Zehnder interferometer (MZI) [6][7][8][9], Sagnac interferometer (SI) [10,11], multimode interferometer [12,13], fiber Bragg grating (FBG) [14,15], Michelson interferometer (MI) [16,17], etc. An optical fiber vibration sensor is multimode sandwiched between two single-mode fibers (SMFs).…”

Section: Introductionmentioning

confidence: 99%

Optical fiber vibration sensor for bearing fault detection based on Sagnac interferometer

Xu¹,

Li²,

Meng³

et al. 2023

Laser Phys.

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Bearings are crucial components in mechanical equipment, and bearing failure is one of the reasons for mechanical equipment safety accidents. In this work, an optical fiber vibration sensor based on Sagnac interferometer (SI) is proposed and applied to bearing fault detection. The polarization-maintaining fiber (PMF) is spliced between two single-mode fibers (SMFs) to form a SMF-PMF-SMF (SPS) fiber structure, which is connected with a 3 dB coupler to form a SI based on SPS fiber structure. The mass block is fixed in the middle of the PMF. When the monitored surface or structure vibrates, the stress of PMF will change and the Sagnac interference spectrum will be shifted, so that the vibration can be measured. The fabrication technology of sensor based on 3D printing is studied, and the structural parameters of the sensor are optimized through experiments and theoretical analysis. A vibration detection system and a rolling bearing vibration test platform based on SI and fiber ring laser are built. The experimental results show that the relative error between the experimental and theoretical results of healthy and faulty bearings is less than 1.60%, and the fault detection of bearings is realized. Temperature cross-sensitivity and stability of the sensing system are analyzed. The sensor has the advantages of simple structure, easy fabrication, anti-interference, etc, and has wide application prospects in engineering, machinery, security and other fields.

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Section: Introductionmentioning

confidence: 99%

Optical fiber vibration sensor for bearing fault detection based on Sagnac interferometer

Xu¹,

Li²,

Meng³

et al. 2023

Laser Phys.

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“…5 By virtue of nested pulsed method, Sagnac vibration sensing system has the possibility to locate the actual vibration with limited frequency band. 6 Backscattering-based optical fiber vibration sensor is used for monitoring the perturbation events by measuring the variation of scattered light intensity in the fiber. Backscattering-based vibration sensor include phase-sensitive optical time-domain reflectometry (φ-OTDR) 78 and Brillouin optical time-domain reflectometry (BOTDR).…”

Section: Introductionmentioning

confidence: 99%

Sagnac interference-based sensitivity tunable optical fiber vibration sensing system

Zheng,

Yu,

Wang

et al. 2023

AOPC 2023: Optic Fiber Gyro

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A vibration optic fiber sensing system with tunable sensitivity based on Sagnac interference is proposed and demonstrated. In virtue of the linear Sagnac interference structure, vibration sensitivity adjustment could be realized by changing the delay fiber length. The phase modulation depth on sensing fiber induced by intrusion disturbance is heavily influenced by the delay fiber length, which reflected in the intensity detected by the AC photo-detector, thus enabling the vibration sensitivity adjustment in optical sensing system. The relationship between the amplitude of intrusion disturbance and delay fiber length shows a sinusoidal function in absolute value.

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“…In [ 16 ], a real-time distributed optical fiber vibration sensing prototype based on the Sagnac interference in conjunction with Optical Time Domain Reflectometry (OTDR) was developed. In [ 17 ], a vibration location method with nested pulses is proposed for a distributed optical fiber vibration sensing system. Additionally, several studies have shown a wide range of situations in which the OFSI systems allow sensing vibrations.…”

Section: Introductionmentioning

confidence: 99%

Sagnac with Double-Sense Twisted Low-Birefringence Standard Fiber as Vibration Sensor

Santiago-Hernández

Beltrán-González

Mora-Núñez

et al. 2022

Sensors

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In this work, we study a double-sense twisted low-birefringence Sagnac loop structure as a sound/vibration sensing device. We study the relation between the adjustments of a wave retarder inside the loop (which allows controlling the transmission characteristic to deliver 10, 100, and 300 μW average power at the output of the system) and the response of the Sagnac sensor to vibration frequencies ranging from 0 to 22 kHz. For a 300 m loop Sagnac, two sets of experiments were carried out, playing at the same time all the sound frequencies mixed for ∼1 s, and playing a sweep of frequencies for 30 s. In both cases, the time- and frequency-domain transmission amplitudes are larger for an average power of 10 μW, and smaller for an average power of 300 μW. For mixed frequencies, the Fourier analysis shows that the Sagnac response is larger for low frequencies (from 0 to ∼5 kHz) than for high frequencies (from ∼5 kHz to ∼22 kHz). For a sweep of frequencies, the results reveal that the interferometer perceives all frequencies. However, beyond ∼2.5 kHz, harmonics are present each ∼50 Hz, revealing that some resonances are present. The results about the influence of the power transmission through the polarizer and power emission of laser diode (LD) on the Sagnac interferometer response at high frequencies reveal that our system is robust, and the results are highly reproducible, and harmonics do not depend on the state of polarization at the input of the Sagnac interferometer. Furthermore, increasing the LD output power from 5 mW to 67.5 mW allows us to eliminate noisy signals at the system output. in our setup, the minimum sound level detected was 56 dB. On the other hand, the experimental results of a 10 m loop OFSI reveal that the response at low frequencies (1.5 kHz to 5 kHz) is minor compared with the 300 m loop OFSI. However, the response at high frequencies is low but still enables the detection of these frequencies, yielding the possibility of tuning the response of the vibration sensor by varying the length of the Sagnac loop.

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Sagnac Vibration Sensing System With Nested Pulse Method

Cited by 11 publications

References 22 publications

Optical fiber vibration sensor for bearing fault detection based on Sagnac interferometer

Optical fiber vibration sensor for bearing fault detection based on Sagnac interferometer

Sagnac interference-based sensitivity tunable optical fiber vibration sensing system

Sagnac with Double-Sense Twisted Low-Birefringence Standard Fiber as Vibration Sensor

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