为了实现海洋水位实时监测以进行有效的海啸预警, 提出了一种全光纤干涉式水位传感系统.针对海洋水位变化范围大、变化速度快的特点, 采用基于双准直器对准的改进式干涉结构和线性调频相位解调方法, 以实现对海洋水位值的大量程、高精度、快响应测量.实验结果表明该水位传感系统的可测量程为0~109.14 m, 测量精度达±1 cm, 可实现0.01 s的响应时间, 具有较好的实时性.该系统对海洋水位监测、海啸预警具有十分积极的意义.

In order to achieve ocean water level monitoring for effective tsunami warning, an allfiber interferometric water level sensing system is proposed and demonstrated. According to the large range and fast response of ocean water level variation, an interference structure based on doublecollimator alignment and a linear frequencychirp based phase demodulation method are adopted, achieving the ocean water level measurement with large range, high precision and fast response. The experimental results show that the measurable range of the water level sensing system is 0~109.14 m, the measurement accuracy can reach ±1 cm, with the response time of 0.01 s. The proposed system is demonstrated to be suitable for ocean water level monitoring and tsunami warning.