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 principle of optical fiber grating chirp-sensing technology are proposed. The spatially varying structure of the chirped fiber grating has been divided into several sections called the effective-interaction sub-regions. Each effective-interaction sub-region prossesses an independent sensing ability and its relationship to the gradient distribution of environmental parameters has been formulated. The origin of the FBG chirping and its effect on the characteristics of the resultant reflection spectra (wavelength, bandwidth and total optical power) under the effect of the surrounding environment (spatial distributions of temperature and strain) have been theoretically explained and experimentally demonstrated. This provides the foundation of the FBG chirp-sensing technology and opens new avenues for its potential applications in simultaneous measurement of multiple parameters and also in the distributed measurement of nonuniform environmental parameters.