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Simultaneous Strain and Temperature Measurement with Optical fiber gratings: Error Analysis

Chinese Journal of Lasers 2000年第3期9卷 52-57页

作者： JIA Hongzhi LI Yulin (Xi’an Institute of Optics & Precision Mechanics, The Chinese Academy of Sciences, Xi’an 710068, China) 中科院西安光学精密机械所陕西西安

Many schemes designed to simultaneously measure strain and t emperature with optical fiber grating sensors have been reported in recent years. In this paper, the influence of systematic errors associated with the measurement process is analyzed and the error formulas are derived. The results are applied to a range of techniques that are of current interest in the literature. The performance of these schemes is contrasted with respect to the influence of wavelength measurement error and sensitivity matrix error.

关键词： fiber grating sensors strain measurement temperature measurement error analysis

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Application of Fractal Theory in Brick-Concrete Structural Health Monitoring

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Engineering（科研） 2016年第9期8卷 646-656页

作者： Changmin Yang Xia Zhao Yanfang Yao Zhongqiang Zhang Architectural Engineering Institute Hebei University Baoding China Hebei College of Science and Technology Baoding China

In order to monitor and forecast the deformation of the brick-concrete building, by taking a brick-concrete building as research object, fiber grating sensors were used to collect the monitoring data and double logarithmic curve of limit value characteristic and monitoring data were obtained based on the fractal theory. Constant dimension fractal method cannot be used to analyze the data directly. With the method of variable dimension fractal, we accumulate data, and the double logarithmic curve is smooth. Piecewise fractal dimensions are close. The outer interpolation method is used to calculate the fractal dimension of the next point and then back calculate the vertical displacement. The relative errors are calculated by comparing the forecast values and monitoring values, and the maximum relative error is 5.76%. The result shows that the fractal theory is suitable to use in the forecast of the deformation and the accuracy is good.

关键词： Brick-Concrete Building Real-Time Monitoring fiber grating sensors Constant Di-mension Fractal Variable Dimension Fractal Log-Log Line Prediction

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