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提出了光纤光栅啁啾化传感概念和传感机理,将光纤光栅微观分解为栅区长度范围的许多具有独立感知能力且彼此关联的有效作用子栅集,表述了有效作用子栅集与待测环境场空间梯度分布之间的对应关系,从而较好地解释了光纤光栅啁啾谱产生的内在机理。理论推导并实验验证了光栅啁啾谱各谱参量(波长、带宽和反射光强)与待测环境场(温度和应变)之间的对应关系,为利用单一光纤光栅实现多参量同时区分测量、任意非均匀空间分布场传感提供了科学有效的解决方法。
The concept and sensing mechanism of fiber grating chirp sensing are proposed. The fiber grating is microscopically decomposed into many effective sub-grid sets with independent sensing ability and inter-related with each other in the length of the gate region. The corresponding relationship between spatial gradient distributions of environmental field is measured, which can well explain the internal mechanism of the chirped spectrum of fiber grating. The corresponding relationship between the spectral parameters (wavelength, bandwidth and reflected light intensity) of the chirped spectrum and the ambient field under test (temperature and strain) was deduced and experimentally verified theoretically. In order to achieve the simultaneous multi-parameter discrimination using a single fiber grating, Any non-uniform spatial distribution of field sensing provides a scientific and effective solution.