Department of Physics, National Chung Cheng University, 168 University Road, Chia-Yi 62102, Taiwan.
Sensors (Basel). 2010;10(7):6582-93. doi: 10.3390/s100706582. Epub 2010 Jul 9.
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.
一种能够区分温度和应变的光纤光栅传感器，使用参考光纤和双波长光纤布拉格光栅。从理论和实验上研究了该传感器的误差分析和测量不确定度。分别估计温度 T 和应变 ε 的测量均方根误差为 0.13°C 和 6 με。温度和应变的最大误差分别计算为 0.00155 T + 2.90×10(-6) ε 和 3.59×10(-5) ε + 0.01887 T。使用置信水平为 95%、覆盖因子为 k = 2.205 的扩展不确定度估计，温度和应变测量不确定度分别为 2.60°C 和 32.05 με。据我们所知，这是首次证明了使用这种光纤光栅传感器同时进行应变-温度传感的测量不确定度估计的可行性。
