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

Lin, Wei‐Hao; Liu, Yibin; Shao, Liyang; Vai, Mang I

doi:10.3390/mi12050586

Cited by 14 publications

(6 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Differently from traditional electronic sensors, optical fiber has its own indispensable advantages, including but not limited to: electrical insulation, corrosion resistance, variable shape, small size, wide range of measuring objects, and easy reuse [ 6 , 7 , 8 , 9 , 10 ]. Among them, temperature, as the most important parameter for perceiving the external environment, has received the most extensive attention from scientists, and has been widely researched [ 11 , 12 , 13 ]. Various optical fiber structures have been designed to improve the sensitivity, stability, and practicability of temperature sensing [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Fiber-Ring Lasers Based on Isopropanol Filled Microfiber Coupler for High-Sensitivity Temperature Sensing

Lin

Zhao

et al. 2022

Micromachines

View full text Add to dashboard Cite

We demonstrated a new method for temperature measurement inside a fiber ring laser (FRL) cavity. Different from traditional FRL temperature sensing system which need additional filter working as a sensor, a micro-fiber coupler (MFC) was designed as a beam splitter, filter, and temperature sensor. In addition, isopropanol, a liquid with very high photothermal coefficient, is selectively filled in the MFC in order to improve the sensitivity of the system on temperature. In the dynamic range of 20 °C–40 °C, we obtained a good temperature sensitivity of −1.29 nm/°C, with linear fitting up to 0.998. Benefiting from the advantages of laser sensing, the acquired laser has a 3 – dB bandwidth of less than 0.2 nm and a signal-to-noise ratio (SNR) of up to 40 dB. The proposed sensor has a low cost and high sensitivity, which is expected to be used in biomedical health detection, real-time monitoring of ocean temperature, and other application scenarios.

show abstract

Section: Introductionmentioning

confidence: 99%

Adaptive Fiber-Ring Lasers Based on Isopropanol Filled Microfiber Coupler for High-Sensitivity Temperature Sensing

Lin

Zhao

et al. 2022

Micromachines

View full text Add to dashboard Cite

show abstract

“…On the other hand, side-polish optical fiber sensors have attracted wide research interests [22][23][24]. The side-polished fiber has a strong evanescent field, enhance the interference effect and polishing will also destroy the original symmetry of fiber structure, making the fiber more sensitive to changes such as axial force, RI [25] and temperature [26].…”

Section: Introductionmentioning

confidence: 99%

Fiber Ring Laser Based on Side-Polished Fiber MZI for Enhancing Refractive Index and Torsion Measurement

Wan

Liu

et al. 2022

IEEE Sensors J.

View full text Add to dashboard Cite

A fiber ring laser based on a side-polish fiber Mach-Zehnder interferometer (MZI) for effective improving refractive index (RI) and torsion sensing is proposed and investigated. The side-polished fiber MZI sensor can not only enhance the evanescent wave but also break circular symmetry of optical fiber face section, so it can be used for the surrounding RI and torsion sensing. A spectrum 3 dB bandwidth of less than 0.15 nm has been achieved which makes the fiber ring laser torsion sensing system to have higher measurement resolution. Experiment results show that the RI and torsion sensitivity of proposed sensor is dependent on the polish depth: the thicker the polish depth, the higher the sensitivity. For a sensor with side polish depth of 47 μm, the measured RI sensitivity reaches -81.36 nm/RIU, the torsion sensitivity is as high as -0.019nm/ O , the sensitivity converted to torsional rate is -0.267 nm/(rad.m -1 ).

show abstract

“…For more information, see https://creativecommons.org/licenses/by/4.0/ The temperature sensitivity is 0.158 nm/ • C without using additional filters [21]. Tapered fibers filled with isopropanol [22] and cascaded Sagnac rings [23] are also designed for temperature modulation. The sensitivities are 4.031 nm/ • C and 1.92 nm/ • C, respectively.…”

mentioning

confidence: 99%

Tunable Electro-Optical and Thermal Optical Modulator Based on a Liquid Crystal-Filled Side Hole Fiber in Fiber Ring Laser

et al. 2021

View full text Add to dashboard Cite

A new tunable electro-optical and thermaloptical modulator based on a liquid crystal (LC) filled side hole fiber (SHF) in fiber ring laser (FRL) system has been proposed and experimentally demonstrated. The LC is penetrated into the air hole of SHF, and the refractive index (RI) of LC will be altered when an external electrical field or temperature difference is applied due to thermal-optical effects and electro-optic effects. SHF is used as both a filter and a sensing head in the laser cavity. Besides, the resonance wavelength is more sensitive to the temperature variations due to high thermal-optic coefficient when incident light interacts with the internal infiltrated LC. Meanwhile, the sensor has good performance with a high extinction ratio (>42 dB) and a narrow 3-dB bandwidth (less than 0.08 nm). The consequent thermal and electronic sensitivity are measured to be −4.23 nm/ • C and 0.604nm/V, respectively. Moreover, the excellent and reliable performance expected to monitor the temperature and electric field as the wavelength-tunable electro-optical devices within a small temperature change range is needed.

show abstract

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

Cited by 14 publications

References 37 publications

Adaptive Fiber-Ring Lasers Based on Isopropanol Filled Microfiber Coupler for High-Sensitivity Temperature Sensing

Adaptive Fiber-Ring Lasers Based on Isopropanol Filled Microfiber Coupler for High-Sensitivity Temperature Sensing

Fiber Ring Laser Based on Side-Polished Fiber MZI for Enhancing Refractive Index and Torsion Measurement

Tunable Electro-Optical and Thermal Optical Modulator Based on a Liquid Crystal-Filled Side Hole Fiber in Fiber Ring Laser

Contact Info

Product

Resources

About