Pressure Sensing Characteristics of Panda Fiber Gratings

Zhizhong, 李智忠 Li; Huayong, 杨华勇 Yang; Yusheng, 程玉胜 Cheng; Yongming, 胡永明 Hu

doi:10.3788/aos20092901.0157

Cited by 2 publications

(5 citation statements)

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“…That is to say, compared with other polarization-maintaining fibers, side-hole fibers not only have better thermal stability, but also have higher pressure sensitivity, so they are especially suitable for pressure sensing. that the temperature sensitivity of the bare fiber grating is only 0.05pm/℃ [2] , which is 1/184 of that of the conventional single-mode fiber grating. A novel side-hole fiber grating packaging device based on lateral load pressure sensitivity enhancement is proposed, which increases the pressure sensitivity of the double-peak spacing of the side-hole fiber grating from 5.…”

Section: Wide Measuring Range and Complete Varietiesmentioning

confidence: 88%

“…Fig. 1-1 is a schematic diagram of the structure of the side hole fiber [2] . Because there is no stress region with high thermal expansion coefficient in the side hole fiber, the side hole fiber has better thermal stability compared with the panda fiber.…”

Section: Wide Measuring Range and Complete Varietiesmentioning

confidence: 99%

“…6 pm/MPa to 119. 14 pm/MPa [2] . The experimental results show that a new type of temperature-insensitive and high-sensitivity pressure sensor [2] is expected to be developed by using side-hole fiber grating technology.…”

Section: Wide Measuring Range and Complete Varietiesmentioning

confidence: 99%

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Reflective liquid density detection method based on cascaded side hole fiber and grating

Zhang¹,

Jia²,

Mao³

et al. 2023

Preprint

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In order to solve the problem that the traditional electronic densimeter, hydrostatic densimeter and vibration densimeter have strong interference in liquid density measurement and the error caused by the equipment posture can not be effectively corrected, a reflective portable liquid density measurement method based on side-hole fiber and grating cascade is proposed through Archimedes buoyancy law and optical principle. Firstly, the pressure difference formed by the equipment in the liquid to be measured causes the change of a reflecting surface and the superposition change of interference light in the grating, the pressure change is calculated through the superposition change, and the density of the liquid to be measured can be preliminarily determined according to the ratio of the pressure change to the reference standard liquid; The attitude error is measured by the attitude detection module based on the MEMS gyroscope and the acceleration sensor, and the accuracy of the density detection is further calibrated. The experimental results show that the portable liquid density detection method based on side-hole fiber grating can effectively improve the precise measurement accuracy, and effectively reduce the accumulation of attitude errors, so that the pressure sensitivity of the double-peak spacing of the side-hole fiber grating can be increased from 5.6pm/MPa to 119.14pm/MPa. Based on MEMS gyroscope and accelerometer, ADXL345 resolution is up to 13 bit, after attitude error compensation, the measured average density deviation is 0. 00023 G/cm3, the maximum density deviation is 0. 0066 G/cm3, which can achieve the measurement accuracy of 0. 001 G/cm3. Meet or exceed existing equipment of the same type for measuring petroleum and non-corrosive liquids. This method provides a theoretical and experimental basis for the quantitative study of liquid density measurement.

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Section: Wide Measuring Range and Complete Varietiesmentioning

confidence: 88%

Section: Wide Measuring Range and Complete Varietiesmentioning

confidence: 99%

See 1 more Smart Citation

Reflective liquid density detection method based on cascaded side hole fiber and grating

Zhang¹,

Jia²,

Mao³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Therefore, FBG is highly sensitive not only to strain (as designed), but also to temperature fluctuation. Numerous studies have been carried out to separate these two effects and/or to find a way for temperature compensation [5][6][7][8] , but the influence of thermal stress on temperature sensitivity of FBG is rarely studied.In this paper, stresses on all directions in FBG embedded in the matrix material are analyzed. With the finite element software we can calculate stresses in FBG, and emulation data is obtained to quest the temperature sensitivity coefficient of smart GFRP bar.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Influence of thermal stress on temperature sensitivity of FBG-GFRP bars

Sun

Zhao

2011

Optoelectron. Lett.

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The influence of thermal stress on the temperature sensitivity of fiber Bragg grating-glass fiber reinforce polymer (FBG-GFRP) bars is studied by three methods, namely, direct experimental calibration method, stress analysis (finite element analysis) method and the method of apparent temperature sensitivity coefficient. In comparison with the other two methods, fewer parameters are required and the calculation is simple in the method of apparent temperature sensitivity coefficient, while the analytical error is limited within 2%. It is concluded that the results of the method of apparent temperature sensitivity coefficient could be good reference for engineering applications.At present, fiber Bragg grating (FBG) sensor is the first choice for structural health monitoring due to its advantages, such as anti-electromagnetic interference, small size, quasi-distributed sensing, corrosion-proof and absolute measurement, etc [1][2][3] . Smart glass fiber reinforce polymer (GFRP) bar was developed by Kalamkarov et al [4] through embedding FBG sensors in a GFRP bar to combine the reinforcement function and the sensing function together in concrete structures. When the temperature fluctuation occurs, the thermal stress is induced by thermal mismatch due to the difference of the thermal expansion coefficients between the optical fiber and the matrix material. Therefore, FBG is highly sensitive not only to strain (as designed), but also to temperature fluctuation. Numerous studies have been carried out to separate these two effects and/or to find a way for temperature compensation [5][6][7][8] , but the influence of thermal stress on temperature sensitivity of FBG is rarely studied.In this paper, stresses on all directions in FBG embedded in the matrix material are analyzed. With the finite element software we can calculate stresses in FBG, and emulation data is obtained to quest the temperature sensitivity coefficient of smart GFRP bar. Moreover, the approximate formula is derived for the simplification of calculation and the convenience of application.In working environment, due to the mismatch of the thermal expansion coefficient, FBG is under stresses from the matrix material in both axial and radial directions, resulting in additional drift from the central wavelength of FBG. Generally, the influence of temperature on the central wavelength of FBG could be divided into three cases: wavelength drift caused by thermo-optic effect and thermal expansion B1 , wavelength drift caused by axial stress B2 , and wavelength drift caused by radial stress B3 . According to Ref.[9], the total wavelength drift can be regarded as the superposition of these three cases, that is: B = B1 + B2 + B3 .When temperature varies, the wavelength drift formula without considering the waveguide effect [9] is given by , 2 B 12 12 11 2 eff B n 1 B zz rr zz p p p n Twhere n is the thermo-optic coefficient of FBG, B is the central wavelength of FBG, p ij is the elastic-optic coefficient of FBG, n eff is the effective refractive index of FBG, and rr an...

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Pressure Sensing Characteristics of Panda Fiber Gratings

Cited by 2 publications

References 0 publications

Reflective liquid density detection method based on cascaded side hole fiber and grating

Reflective liquid density detection method based on cascaded side hole fiber and grating

Influence of thermal stress on temperature sensitivity of FBG-GFRP bars

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