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Passive temperature compensation package for fiber Bragg grating

机译:光纤布拉格光栅的无源温度补偿套件

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The reflecting wavelength shift of fiber Bragg grating (FBG) can be caused by the variations of both strain and temperature, and such a so-called cross sensitivity is a "bottle-neck" which limits the FBG sensing and measuring technique to put into practical application. The measurement error is caused by the temperature change to measure the strain-inducing Bragg wavelength shift. The basic theory of temperature compensation of fiber Bragg gratings is presented according to the physical mechanisms of the strain and temperature cross sensitivity. A passive compact package for compensating the temperature dependence of FBG, based on the use of two materials with different thermal expansion coefficients, has been demonstrated. Two ends of the tensioned fiber grating are attached to the organic glass with epoxy resin. As the temperature rises and the strain is progressively released, it compensates the temperature dependence of the Bragg wavelength. The relation between temperature and wavelength in different compensation condition and in different strain is given. And the reason of undercompensation or overcompensation of the FBG is also analyzed. The Bragg wavelength shift over the temperature range of -19°C to 60°C is 0.79 nm for the uncompensated FBG, and that of the compensated FBG is only 0.035 nm for uncompensated FBG, which is 1/22 of that of the uncompensated FBG.
机译:光纤布拉格光栅(FBG)的反射波长偏移可能是由应变和温度的变化引起的,这种所谓的交叉灵敏度是“瓶颈”,它限制了FBG传感和测量技术的实际应用。应用。测量误差是由温度变化引起的,以测量引起应变的布拉格波长偏移。根据应变和温度交叉敏感性的物理机理,提出了光纤布拉格光栅温度补偿的基本理论。基于使用两种具有不同热膨胀系数的材料,已经证明了一种无源紧凑型封装,用于补偿FBG的温度依赖性。张紧的光纤光栅的两端用环氧树脂固定在有机玻璃上。随着温度的升高和应变的逐渐释放,它补偿了布拉格波长对温度的依赖性。给出了不同补偿条件,不同应变下温度与波长的关系。并分析了光纤光栅补偿不足或补偿过度的原因。对于未补偿的FBG,在-19°C至60°C的温度范围内的布拉格波长偏移为0.79 nm,对于未补偿的FBG,补偿的FBG的波长偏移仅为0.035 nm,是未补偿的FBG的1/22。 。

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