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刘兆坤;杜大伟;赵强;陈东营;惠力;张文;孙鹏;郭风祥 《光子学报》2025,(4):157-168
波浪的实测数据对海浪模型校准、海上生产实践以及海洋灾害预防具有重要作用。提出了一种基于光纤布拉格光栅的压力式海洋波浪高度传感器,实现对海洋波浪高度的实时测量。采用有限元分析对传感器结构进行优化设计,并对传感器的测量原理进行理论分析。通过标定实验可知该波浪高度传感器的压力灵敏度为-9.486 nm/MPa,有效测量量程为0～0.3 MPa。针对传统零线提取方法存在的零点遗漏问题,提出了基于平滑先验方法的波浪零线选取方法,实现零点动态选择,该方法在复杂海洋条件下表现出更好的适用性。外场实验结果表明,该波浪高度传感器各波高特征值的变化趋势与SBF3-2型波浪浮标的测量结果一致,两者相关系数均高于0.85,验证了光纤布拉格光栅海洋波浪高度传感器的可行性。该传感器具有水下无源、抗电磁干扰、信号传输速度快的特点,可为近岸波高测量提供一种新的光学测量方法,具有良好的应用前景。 相似文献
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<正>This paper stuides the elastic constants and some thermodynamic properties of Mg2SixSnn-1（x=0,0.25,0.5, 0.75,1） compounds by first-principles total energy calculations using the pseudo-potential plane-waves approach based on density functional theory,within the generalized gradient approximation for the exchange and correlation potential. The elastic constants of Mg2SixSnn-1 were calculated.It shows that,at 273 K,the elastic constants of Mg2Si and Mg2Sn are well consistent with previous experimental data.The isotropy decreases with increasing Sn content.The dependences of the elastic constants,the bulk modulus,the shear modulus and the Debye temperatures of Mg2Si and Mg2Si0.5Sn0.5 on pressure were discussed.Through the quasi-harmonic Debye model,in which phononic effects were considered,the specific heat capacities of Mg2SixSn1-x at constant volume and constant pressure were calculated.The calculated specific heat capacities are well consistent with the previous experimental data. 相似文献
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