Sagnac interferometer-based optical fiber strain sensor with exceeding free spectral measurement range and high sensitivity

Liu, Chaoyi; Chen, Hailiang; Chen, Qiang; Gao, Zhigang; Wu, Biao; Fan, Xiaoya; Ma, Mengdong

doi:10.1016/j.optlastec.2022.108935

Cited by 34 publications

(4 citation statements)

References 29 publications

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“…Moreover, the axial twist loaded into the fiber also changes the birefringence and length. And temperature and twist sensitivities can be expressed by the following formula [ 19 ]:

where

and

are the temperature and twist-sensing coefficient.…”

Section: Sensor Principlementioning

confidence: 99%

Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber

Zhang,

Zheng,

Zhu

et al. 2024

Sensors

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We utilized a CO2 laser to carve long-period fiber gratings (LPFGs) on polarization-maintaining fibers (PMFs) along the fast and slow axes. Based on the spectra of LPFGs written along two different directions, we found that when LPFG was written along the fast axis, the spectrum had lower insertion loss and fewer side lobes. We investigated the temperature and twist characteristics of the embedded structure of the LPFG and Sagnac loop and ultimately obtained a temperature sensitivity of −0.295 nm/°C and a twist sensitivity of 0.87 nm/(rad/m) for the LPFG. Compared to the single LPFG, the embedded structure of the LPFG and Sagnac loop demonstrates a significant improvement in temperature and twist sensitivities. Additionally, it also possesses the capability to discern the direction of the twist. The embedded structure displays numerous advantages, including easy fabrication, low cost, good robustness, a wide range, and high sensitivity. These features make it highly suitable for applications in structural health monitoring and other related fields.

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“…Moreover, the axial twist loaded into the fiber also changes the birefringence and length. And temperature and twist sensitivities can be expressed by the following formula [ 19 ]:

where

and

are the temperature and twist-sensing coefficient.…”

Section: Sensor Principlementioning

confidence: 99%

Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber

Zhang,

Zheng,

Zhu

et al. 2024

Sensors

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“…2(b). 55 The sensor consists of a photonic crystal fibre with a small air cavity that acts as a strain sensor. This type of sensor has several advantages, including high sensitivity, fast response time, and the ability to measure strain in multiple directions.…”

Section: Overview Of Piezoresistive Based Strain Sensors With Perform...mentioning

confidence: 99%

The technology of wearable flexible textile-based strain sensors for monitoring multiple human motions: construction, patterning and performance

Liza,

Kabir,

Jiang

et al. 2023

Sens. Diagn.

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“…Much effort has been made in the field of optical fiber sensors to meet the requirements of simultaneously measuring multiple parameters and improving sensing performance. Fiber gratings, including long-cycle fiber gratings and fiber Bragg gratings (FBGs), are hybrid sensors commonly used to monitor multiple physical parameters [23][24][25][26]. These hybrid sensors are typically manufactured by cascading other optical fiber structures such as photon crystal fiber (PCF), cone type optical fiber, SI [26], MZI, Fabry-Perot interferometer (FPI) [27] and Michelson interferometer.…”

Section: Introductionmentioning

confidence: 99%

“…Fiber gratings, including long-cycle fiber gratings and fiber Bragg gratings (FBGs), are hybrid sensors commonly used to monitor multiple physical parameters [23][24][25][26]. These hybrid sensors are typically manufactured by cascading other optical fiber structures such as photon crystal fiber (PCF), cone type optical fiber, SI [26], MZI, Fabry-Perot interferometer (FPI) [27] and Michelson interferometer. Fiber gratings are not the optimal choice due to their high production cost, complicated production process, and insufficient sensitivity, which makes it difficult to monitor changes in the number of parameters.…”

Section: Introductionmentioning

confidence: 99%

Paralleled Sagnac interferometer and Mach–Zehnder interferometer for enhanced measurements sensitivity based on Vernier effect

Shi,

Chen,

et al. 2024

J. Phys. D: Appl. Phys.

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In this paper, Vernier effect (VE) was experimentally excited through paralleling Sagnac interferometer (SI) and Mach-Zehnder interferometer (MZI). SI was fabricated by a 38 cm long panda-shaped polarization maintaining fiber (PMF) in the Sagnac loop, while MZI was made through pulling single mode fiber (SMF) into a tapered type fiber. The strain and temperature sensitivities of the paralleled SI and MZI were 51.97 pm/με and 2.94 nm/℃ respectively, which were increased approximately 3 times than an individual SI whose measurement sensitivities of strain and temperature were 18.24 pm/με and 0.98 nm/℃ correspondingly. The theoretical analysis of the single interference and paralleled interferences were verified by the experimental results. The proposed sensor shows simple in fabrication, high sensitivity, and good hysteresis, is a strong competitor in monitoring the strain and temperature.

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Sagnac interferometer-based optical fiber strain sensor with exceeding free spectral measurement range and high sensitivity

Cited by 34 publications

References 29 publications

Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber

Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber

The technology of wearable flexible textile-based strain sensors for monitoring multiple human motions: construction, patterning and performance

Paralleled Sagnac interferometer and Mach–Zehnder interferometer for enhanced measurements sensitivity based on Vernier effect

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