EFPI-FBG hybrid sensor for simultaneous measurement of high temperature and large strain

Li, Xiong; Zhang, Dongsheng; Li, Litong; Guo, Yongxing

doi:10.3788/col201412.120605

Cited by 33 publications

(12 citation statements)

References 8 publications

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“…Recent years, fiber optic sensors offer a promising alternative to electric measurement elements. As a particular class of optical fiber sensors, fiber Bragg grating (FBG) sensors have attracted considerable attention from various research communities because of their distinguishing advantages, such as immunity to electromagnetic noise and optical power fluctuations, small profile, light weight, high resistance to hostile environments, no zero temperature drift and the fact that multiple FBGs can be arrayed along a single fiber [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A three-axis force fingertip sensor based on fiber Bragg grating

Guo

Kong

Liu

et al. 2016

Sensors and Actuators A: Physical

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Section: Introductionmentioning

confidence: 99%

A three-axis force fingertip sensor based on fiber Bragg grating

Guo

Kong

Liu

et al. 2016

Sensors and Actuators A: Physical

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“…Fiber Bragg gratings (FBGs) are widely used in communications, sensing, and fiber laser applications because of their agile spectrum control and easy manufacturing processes [1,2]. However, because of their fragile fiber structure, FBGs are susceptible to mechanical vibration as well as acoustic and thermal influence.…”

Section: Introductionmentioning

confidence: 99%

V-groove-based compact FBG package for thermal tuning and mechanical stability

et al. 2016

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methods have been developed for different applications. Bimaterial packages have been proposed for a-thermal design [3][4][5][6], but those packages increased the original length of the FBG. Metallization of the FBG can increase the thermal sensitivity and mechanical stability, but it is difficult to maintain the original spectrum [7,8]. Polymer FBGs (PFBGs) have also been developed with high thermal and moisture sensitivity, but some research is still needed for manufacturing and packaging [9]. Planar waveguide Bragg gratings have been well developed using semiconductors [10-12], but they require complicated processes and the performance is limited compared with FBGs. Here, we presented a V-groove-based FBG package, which can be used to re-design the thermal sensitivity of FBGs to any value by selecting an appropriate substrate material (from 10 to 160 pm/K), with an unchanged spectrum, compact size, and good mechanical stability as bulky components. Furthermore, the developed FBG package can be used as a planar waveguide grating but with greater agility in fiber grating design and manufacture. Highly thermal-sensitive FBG packages can be used as tunable filters or temperature sensors in telecommunications, external cavity lasers, and sensing areas. Principle designThe V-groove is a longitudinal cut on the substrate material as shown in Fig. 1a. The V-groove about 0.3 mm in width and depth, making a regular triangle slot, can easily hold the fiber straight. The V-groove will then be filled with glue to fix the fiber inside. As shown in Fig. 1b, in the regular triangular slot the fiber is enclosed in glue from all sides; this minimizes glue stress damage on the FBG spectrum. The FBG is finally embedded in the upper surface Abstract We demonstrated a V-groove-based fiber Bragg grating (FBG) package that has been glue-filled and cured to make it a bulky component with much improved mechanical stability. The V-groove can be executed with many types of materials including plastics, ceramics, semiconductors, and metals, providing an easy method for redesigning the thermal tuning performance of FBGs by selecting among a wide variety of materials and processes. We achieved more than 10-nm thermal wavelength tuning and thermal sensitivity ranging from 15 to 160 pm/K. The original FBG spectrum can be maintained without any degradation because the fiber is buried in the V-groove. The compact package does not increase the original grating length and turns the FBG into a planar waveguide grating, improving FBG applications in telecommunications, external cavity lasers, and sensing areas.

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“…A large number of techniques have been proposed to remedy this critical problem and thus to implement the accurate sensing of the both measurands simultaneously. These techniques are using the broadband light source as the sensing probe signal, and their configuration structures are based on multimode fiber (MMF) [16], PCF [17], core-offset single-mode fiber (SMF) [18], [19], Fabry-Perot interferometer [20] and up-taper [21] with in-line embedded FBG. However, all of these conventional sensing systems illuminated by broadband light source face the challenges of low measurement resolution, low spectrum extinction ratio and impossibility for remote sensing.…”

Section: Introductionmentioning

confidence: 99%

Twin-Core Fiber-Based Erbium-Doped Fiber Laser Sensor for Decoupling Measurement of Temperature and Strain

et al. 2015

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In this paper, a novel all-fiber laser sensing configuration for decoupling measurement of strain and temperature based on the twin-core fiber (TCF) with an in-line embedded fiber Bragg grating (FBG) is proposed and experimentally demonstrated. An erbium doped fiber ring laser is built, with an optical signal-to-noise ratio higher than 40 dB and a power instability of 6.75 µW in 1 h. Due to the different spectrum responses of the TCF and FBG to the uniform variation of strain and temperature, the decoupling measurement for these two measurands could be achieved by real-time monitoring both the center wavelength shift and the peak power variation.Index Terms-Fiber-optic sensor, twin core fiber (TCF), fiber Bragg grating (FBG), decoupling measurement, fiber laser sensor.

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EFPI-FBG hybrid sensor for simultaneous measurement of high temperature and large strain

Cited by 33 publications

References 8 publications

A three-axis force fingertip sensor based on fiber Bragg grating

A three-axis force fingertip sensor based on fiber Bragg grating

V-groove-based compact FBG package for thermal tuning and mechanical stability

Twin-Core Fiber-Based Erbium-Doped Fiber Laser Sensor for Decoupling Measurement of Temperature and Strain

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