High sensitivity Sagnac interferometric strain sensor based polarization maintaining fibre enhanced coupling

Ruan, Jishou

doi:10.1049/ote2.12010

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…According to Equation ( 5), the applied axial strain in fact can be magnified due to the reduced diameter of the taper waist. In theory, similar to the schemes reported in [24][25][26], the corresponding wavelength shift should be larger than that in an un-tapered structure. In our structure, under a suitable waist diameter, we experimentally prove that the energy loss of an evanescent wave field is very sensitive to the variation of the waist diameter caused by the increased or decreased axial strain.…”

Section: Discussionsupporting

confidence: 72%

“…Liu et al prepared a hybrid silica-polymer fiber sensor to gain the sensitivity of 28 pm/µε under an ultrahigh pressure condition [23]. In addition, Ruan and Yin respectively fabricated the bubble based micro-cavity interferometers through precise arc-discharge control, and the strain sensitivities were further increased to more than 30 pm/µε [24,25]. Moreover, the highest sensitivity so far reached 1.15 nm/µε in the range of 0~230 µε, through a cascaded micro-cavity structure [26].…”

Section: Introductionmentioning

confidence: 99%

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Ultra-Sensitive Intensity Modulated Strain Sensor by Tapered Thin-Core Fiber Based Modal Interferometer

et al. 2021

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In this paper, to enhance practicality, a novel tapered thin-core fiber (t-TCF) based modal interferometer is proposed and demonstrated experimentally. The light field distribution of t-TCF structure is investigated by a beam propagation method, and the quantitative relationship is gained between light intensity loss and waist diameter. Under ~30 μm waist diameter, multiple t-TCF based sensor heads are fabricated by arc-discharged splicing and taper techniques, and comprehensive tests are performed with respects to axial strain and temperature. The experimental results show that, with near-zero wavelength shift, obvious intensity strain response is exhibited and negative-proportional to the reduced length of TCF. Thus, the maximum sensitivity reaches 0.119 dB/με when the TCF length is equal to 15 mm, and a sub-micro-strain detection resolution (about 0.084 με) is obtained. Besides, owing to the flat red-shifted temperature response, the calculated cross-sensitivity of our sensor is compressed within 0.32 με/°C, which is promising for high precision strain related engineering applications.

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Section: Discussionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Ultra-Sensitive Intensity Modulated Strain Sensor by Tapered Thin-Core Fiber Based Modal Interferometer

et al. 2021

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“…The strain was supplied by the weight and calculated by the equation of ε = F/(AE) [13,23], where F, A and E are the pulling force, cross section area and Young's modulus of silica fiber respectively. The transmission spectra responding to axial stress applied were measured by the OSA.…”

Section: Experiments and Analysismentioning

confidence: 99%

Ultra-high sensitivity strain sensor based on Mach–Zehnder–Sagnac interferometer

Ruan¹,

Zhang²,

Ge³

2021

Meas. Sci. Technol.

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A highly sensitive strain sensor is demonstrated experimentally. A segment of thin-core fiber (TCF) was fusion spliced with the polarization maintaining fiber (PMF) and then prepared TCF-PMF structure was fusion spliced with 3 dB optical fiber coupler to build a Sagnac loop. The Mach-Zehnder interferometer formed by TCF interacts with the Sagnac interferometer constructed by PMF and a coupler. The configuration of proposed sensor extremely enhances the axial strain sensitivity. The strain sensor with an excellent fringe contrast of 27.5 dB was observed. The interference spectra had a blue-shift with increasing strain and the strain sensitivity of −200 pm (µε) −1 was obtained experimentally. Moreover, the temperature characteristics of the strain sensor were also investigated. The proposed sensor with a cost-efficient setup and simple fabrication could be used for strain measurement.

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“…This leads to a decrease in the efficiency of interference when the two beams recombine, resulting in reduced contrast of interference fringes [9]. Sagnac interferometers can employ polarization control techniques or high birefringent fibers to maintain the polarization characteristics of transmitted light, but this undoubtedly adds complexity and cost to the system [10,11]. However, FP interferometers, due to their short cavity length or propagation in air, can effectively ignore the issue of optical power fading [9].…”

Section: Introductionmentioning

confidence: 99%

A Review of Optical Fiber Sensing Technology Based on Thin Film and Fabry–Perot Cavity

Ma,

Peng,

Bai

et al. 2023

Coatings

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Fiber sensors possess characteristics such as compact structure, simplicity, electromagnetic interference resistance, and reusability, making them widely applicable in various practical engineering applications. Traditional fiber sensors based on different microstructures solely rely on the thermal expansion effect of silica material itself, limiting their usage primarily to temperature or pressure sensing. By employing thin film technology to form Fabry–Perot (FP) cavities on the end-face or inside the fiber, sensitivity to different physical quantities can be achieved using different materials, and this greatly expands the application range of fiber sensing. This paper provides a systematic introduction to the principle of FP cavity fiber optic sensors based on thin film technology and reviews the applications and development trends of this sensor in various measurement fields. Currently, there is a growing need for precise measurements in both scientific research and industrial production. This has led to an increase in the variety of structures and sensing materials used in fiber sensors. The thin film discussed in this paper, suitable for various types of sensing, not only applies to fiber optic FP cavity sensors but also contributes to the research and advancement of other types of fiber sensors.

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High sensitivity Sagnac interferometric strain sensor based polarization maintaining fibre enhanced coupling

Cited by 9 publications

References 20 publications

Ultra-Sensitive Intensity Modulated Strain Sensor by Tapered Thin-Core Fiber Based Modal Interferometer

Ultra-Sensitive Intensity Modulated Strain Sensor by Tapered Thin-Core Fiber Based Modal Interferometer

Ultra-high sensitivity strain sensor based on Mach–Zehnder–Sagnac interferometer

A Review of Optical Fiber Sensing Technology Based on Thin Film and Fabry–Perot Cavity

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