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降低光纤布拉格光栅(FBG)应变传感器的应变灵敏度是解决传感器量程小、无法监测大应变问题的一种重要方法。为了监测构件在使用过程中的应力应变变化,提出了螺旋倾斜式光栅复合技术,建立了光栅实测应变与试样实际应变间的理论关系,在不同螺旋倾角下进行了光栅应变灵敏度的测量试验。试验结果表明,该方法能有效降低光栅应变灵敏度,增大光栅应变测量量程。
Reducing the strain sensitivity of fiber optic Bragg grating (FBG) strain transducers is an important way to solve the problem of small sensor range and failure to monitor large strain. In order to monitor the change of stress and strain during the use of components, a helical tilting grating composite technique was proposed. The theoretical relationship between the measured strain of the grating and the actual strain of the specimen was established. The grating strain sensitivity was measured under different helix angles. The experimental results show that this method can effectively reduce the grating strain sensitivity and increase the grating strain measurement range.