&lt;title&gt;Fiber optic vibration sensor based on over-coupled fused coupler&lt;/title&gt;

Chang, Jun; Ma, L.; Liu, Tongyu; Wang, Hongchun; Huo, Dianheng; Ni, Jiasheng; Shi, Zhidong

doi:10.1117/12.726515

Cited by 14 publications

(5 citation statements)

References 2 publications

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“…In this category, we briefly discuss the various potential sensors that includes twist sensors [ 27 , 51 ], micro-force sensors [ 50 ], strain sensors [ 53 ], ultrasound sensors [ 95 , 96 , 97 , 98 ], vibration sensors [ 52 ], current sensors [ 68 ], micro-displacement sensors [ 99 ], and fluid velocity sensors [ 70 ].…”

Section: Sensing Applicationsmentioning

confidence: 99%

“…By analyzing the variation of coupling ratio, the information of amplitude and frequency of ultrasound was obtained. The principle of vibration sensor in Reference [ 52 ] is similar to this work. Wang et al put a multimode MFC on an aluminum foil, taking the advantage that multimode fiber is more sensitive to bending due to the characteristics of a larger core and multiple modes.…”

Section: Sensing Applicationsmentioning

confidence: 99%

“…After that, numerous physical, chemical, and biosensors based on MFC have been demonstrated. Refractive index (RI) [ 25 , 28 , 29 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ], force [ 50 ], twist [ 27 , 51 ], vibration [ 52 ], and strain [ 53 ] have direct effect on the signal transmission of MFC waist region. By covering and well packaging the waist region with functional materials, monitoring of temperature [ 23 , 24 , 28 , 31 , 32 , 37 , 42 , 43 , 46 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ], humidity [ 31 , 57 , 61 , 62 , 63 , 64 , 65 , 66 ], magnetic field [ 30 , 67 , 68 ,…”

Section: Introductionmentioning

confidence: 99%

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State-of-the-Art Optical Microfiber Coupler Sensors for Physical and Biochemical Sensing Applications

et al. 2020

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An optical fiber coupler is a simple and fundamental component for fiber optic technologies that works by reducing the fiber diameter to hundred nanometers or several micrometers. The microfiber coupler (MFC) has regained interest in optical fiber sensing in recent years. The subwavelength diameter rationales vast refractive index (RI) contrast between microfiber “core” and surrounding “cladding”, a large portion of energy transmits in the form of an evanescent wave over the fiber surface that determines the MFC ultrasensitive to local environmental changes. Consequently, MFC has the potential to develop as a sensor. With the merits of easy fabrication, low cost and compact size, numerous researches have been carried out on different microfiber coupler configurations for various sensing applications, such as refractive index (RI), temperature, humidity, magnetic field, gas, biomolecule, and so on. In this manuscript, the fabrication and operation principle of an MFC are elaborated and recent advances of MFC-based sensors for scientific and technological applications are comprehensively reviewed.

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Section: Sensing Applicationsmentioning

confidence: 99%

Section: Sensing Applicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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State-of-the-Art Optical Microfiber Coupler Sensors for Physical and Biochemical Sensing Applications

et al. 2020

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“…Recently, fiber-optic vibration (or, equivalently, acceleration) sensors have received more attention than their electrical counterparts because of their inherent superiority, as described above [84,85,86,87,88,89,90,91,92,93,94,95,96]. In particular, FBG accelerometers have undergone rapid development and have established themselves as the leading technology, compared to other fiber sensor technologies.…”

Section: Functional Fbg Sensorsmentioning

confidence: 99%

Fiber Bragg Grating Sensors for the Oil Industry

Qiao

Shao

Bao

et al. 2017

Sensors

174

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With the oil and gas industry growing rapidly, increasing the yield and profit require advances in technology for cost-effective production in key areas of reservoir exploration and in oil-well production-management. In this paper we review our group’s research into fiber Bragg gratings (FBGs) and their applications in the oil industry, especially in the well-logging field. FBG sensors used for seismic exploration in the oil and gas industry need to be capable of measuring multiple physical parameters such as temperature, pressure, and acoustic waves in a hostile environment. This application requires that the FBG sensors display high sensitivity over the broad vibration frequency range of 5 Hz to 2.5 kHz, which contains the important geological information. We report the incorporation of mechanical transducers in the FBG sensors to enable enhance the sensors’ amplitude and frequency response. Whenever the FBG sensors are working within a well, they must withstand high temperatures and high pressures, up to 175 °C and 40 Mpa or more. We use femtosecond laser side-illumination to ensure that the FBGs themselves have the high temperature resistance up to 1100 °C. Using FBG sensors combined with suitable metal transducers, we have experimentally realized high- temperature and pressure measurements up to 400 °C and 100 Mpa. We introduce a novel technology of ultrasonic imaging of seismic physical models using FBG sensors, which is superior to conventional seismic exploration methods. Compared with piezoelectric transducers, FBG ultrasonic sensors demonstrate superior sensitivity, more compact structure, improved spatial resolution, high stability and immunity to electromagnetic interference (EMI). In the last section, we present a case study of a well-logging field to demonstrate the utility of FBG sensors in the oil and gas industry.

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“…17,18 Moreover, the rational output (RO) between the sensing and the reference signals minimizes the effect of source fluctuations and bending losses at the source end. 19 2 Theory and Design of the Sensor In general, the required major quantity to measure the vibration is displacement. The velocity and acceleration can be measured from the displacement, because these parameters are inter-related to each other.…”

Section: Introductionmentioning

confidence: 99%

Vibration sensor using 2 × 2 fiber optic coupler

et al. 2013

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A simple fiber optic vibration sensor is designed and demonstrated using fiber optic fused 2 × 2 coupler that utilized the principle of reflected light intensity modulation. In order to avoid source signal power fluctuations and fiber bending losses, the rational output (RO) technique is adopted. A calibrated 1-mm linear and high sensitivity of 0.36 a:u:∕mm (2.1 mV∕μm) region of the displacement characteristic curve is considered for vibration measurement. The experimental results show that the sensor is capable of measuring the frequency up to 3500 Hz with ∼0.03 − μm resolution of vibration amplitude over a dynamic range of 0 to 1 mm. The signal-to-noise ratio of the RO is also improved with respect to the sensing signal. In comparison with dual-fiber and bifurcated-bundle fiber, the designed sensor consists only of a single slope that makes the sensor alignment simple by eliminating the dark region and front slope. Simplicity in design, noncontact measurement, high degree of sensitivity, and economical, along with advantages of fiber optic sensors, are the attractive attributes of the designed sensor that lend support to real-time monitoring and embedded applications.

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<title>Fiber optic vibration sensor based on over-coupled fused coupler</title>

Cited by 14 publications

References 2 publications

State-of-the-Art Optical Microfiber Coupler Sensors for Physical and Biochemical Sensing Applications

State-of-the-Art Optical Microfiber Coupler Sensors for Physical and Biochemical Sensing Applications

Fiber Bragg Grating Sensors for the Oil Industry

Vibration sensor using 2 × 2 fiber optic coupler

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