Optical fiber temperature sensor with insensitive refractive index and strain based on phase demodulation

Nan, Tong; Liu, Bo; Wu, Yongfeng; Wang, Junfeng; Mao, Yaya; Zhao, Lilong; Sun, Tingting; Wang, Jin

doi:10.1002/mop.32546

Cited by 7 publications

(2 citation statements)

References 23 publications

(30 reference statements)

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“…For example, Fu et al proposed a multimode interferometer on the basis of an offset spliced single-mode fiber (SMF) structure with temperature and strain sensitivities of only −0.026 rad/°C and 0.0003 rad/με, respectively [14]. Nan et al used a suspended-core microstructure optical fiber sensor for temperature measurement with a low sensitivity of −0.011 rad/°C on the basis of phase demodulation [19]. Galarza et al proposed a new liquid-level sensor multiplexed system on the basis of multimode interference microfibers with a sensitivity of 11.4 rad/mm [20].…”

Section: Introductionmentioning

confidence: 99%

Phase Demodulation Based on K-Space With High Sensitivity for Interferometric Fiber Sensor

Ling

Tian

et al. 2022

IEEE Photonics J.

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This study firstly proposes and experimentally demonstrates a phase demodulation method with high sensitivity for interferometric fiber sensors (IFSs) on the basis of the fast Fourier transform of a wavenumber domain. The phase information of IFSs triggered by changes in environmental parameters is obtained by calculating the initial phase variation of a specific Fourier-transformed spatial frequency. Theoretically, phase sensitivity can be improved by n times when the optical path difference (OPD) of a spatial frequency peak is increased by a multiple (n times) of the OPD of other spatial frequency domain peaks. To verify the method experimentally, this study designed a large laterally offset spliced sensor formed by common singlemode fibers on the basis of mode interference. The sensing characteristics of temperature and strain in each set of two-beam interference are analyzed simultaneously by calculating the phase sensitivities of the frequency domain peaks. Furthermore, the highest reported temperature and strain sensitivities of 0.0795 rad/°C and −0.0088 rad/με, respectively, with good repeatability are realized.

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Section: Introductionmentioning

confidence: 99%

Phase Demodulation Based on K-Space With High Sensitivity for Interferometric Fiber Sensor

Ling

Tian

et al. 2022

IEEE Photonics J.

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“…Lei et al, demonstrated an optical fiber temperature sensor based on a dual-loop optoelectronic oscillator (OEO) with the Vernier effect by using slightly different lengths of single mode fiber [10]. Besides, there are various optical fiber structures designed for temperature measurement [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

A Fiber Ring Laser Sensor with a Side Polished Evanescent Enhanced Fiber for Highly Sensitive Temperature Measurement

et al. 2021

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We demonstrate a highly sensitive and practical fiber-based temperature sensor system. The sensor is constructed based on a fiber ring laser (FRL) as well as a side-polished fiber filled with isopropanol. The laser cavity of the sensing part fiber is polished by the wheel fiber polishing system with residual thickness (RT) is selected to detect the temperature in the FRL. Thanks to the high thermo-optic coefficient of isopropanol, the sensitivity of the proposed temperature sensor could be effectively improved by filling isopropanol in the cost-less side polished single mode fiber. Refractive index (RI) of isopropanol changes with the surrounding temperature variation allowing high-sensitivity temperature sensing. Experimental results demonstrate that the side polished fiber can efficiently excite high-order cladding modes which enhance the modular interference increase the interaction between the evanescent wave and the isopropanol. Besides, the results show that the sensitivity can be as high as 2 nm/°C in the temperature range of 25 °C–35°C.

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An optical fiber temperature sensor based on fluorescence intensity ratio used for real-time monitoring of chemical reactions

Yang

Shen

et al. 2021

Ceramics International

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Optical fiber temperature sensor with insensitive refractive index and strain based on phase demodulation

Cited by 7 publications

References 23 publications

Phase Demodulation Based on K-Space With High Sensitivity for Interferometric Fiber Sensor

Phase Demodulation Based on K-Space With High Sensitivity for Interferometric Fiber Sensor

A Fiber Ring Laser Sensor with a Side Polished Evanescent Enhanced Fiber for Highly Sensitive Temperature Measurement

An optical fiber temperature sensor based on fluorescence intensity ratio used for real-time monitoring of chemical reactions

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