【摘要】 提出了一种新颖的基于光纤 Bragg光栅的斜拉桥索力实时监测方法。随着外界应力的变化 ,光纤光栅的Bragg中心反射波长将发生相应的移动。利用此特性 ,通过对波长移动量 (Δλb)的解调 ,就可以测出索力的大小。实验结果与理论分析证明 ,该测试系统具有结构简单、测量范围大、稳定性和线性度好、灵敏度和信噪比高、对测试人员没有特殊要求等特点 ,该测量方法用于索力监测是可行的、有效的更多还原

【Abstract】 In this paper, a new on line monitoring method based on FBG for cable tension of cable stayed bridge is introduced. Accompany with the changed outside pressure, the Bragg center reflective wavelength of optical fiber grating will be changed correspondly. According to this characteristic and through demodulating the Δ λ b , the value of the cable tension may be determined. The experiment results and theory indicate that the test system has good stability and linear response capacity, high intensity signal and signal to noise ratio, and has no request for test man, The measurement method for test of cable tension is practical and effective.更多还原