A fiber grating sensor capable of distinguishing between temperature and strain, using a reference and a dual-wavelength fiber Bragg grating, is presented. Error analysis and measurement uncertainty for this sensor are studied theoretically and experimentally. The measured root mean squared errors for temperature T and strain ε were estimated to be 0.13 °C and 6 με, respectively. The maximum errors for temperature and strain were calculated as 0.00155 T + 2.90 × 10−6 ε and 3.59 × 10−5 ε + 0.01887 T, respectively. Using the estimation of expanded uncertainty at 95% confidence level with a coverage factor of k = 2.205, temperature and strain measurement uncertainties were evaluated as 2.60 °C and 32.05 με, respectively. For the first time, to our knowledge, we have demonstrated the feasibility of estimating the measurement uncertainty for simultaneous strain-temperature sensing with such a fiber grating sensor.
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机译:提出了一种能够使用参考和双波长光纤布拉格光栅来区分温度和应变的光纤光栅传感器。从理论上和实验上研究了该传感器的误差分析和测量不确定度。测得的温度T和应变ε的均方根误差分别为0.13°C和6με。温度和应变的最大误差分别为0.00155 T + 2.90×10-6ε和3.59×10-5ε+ 0.01887T。使用覆盖系数k = 2.205时在95%置信度下的扩展不确定性的估计,温度和应变测量的不确定性分别为2.60°C和32.05με。就我们所知,这是我们首次展示了用这种光纤光栅传感器估算同时进行应变温度传感的测量不确定度的可行性。
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