Arrival time fluctuation of higher order normal modes caused by solitary internal waves

The sensitivities of the normal modes arrival time to solitary internal waves （IWs） are analyzed by using the SW06 environments. Simulation results show that the arrival time of mode 1 is relatively stable. But, there are some higher-order normal modes which arrive earlier than mode 1, and fluctuate with the appearance of solitary IWs. Explanation of the phenomenon is given based on ray theory. It is shown that, when thermocline falls down to some depths, those higher-order modes with a group of definite grazing angles mainly propagate above the thermocline and arrive earlier.

以色列1900CT球管灯丝易烧断改造工程一例

解决开机时高于正常波3倍的强干扰波是问题的关健,而如何躲过这高于正常波3倍的强干扰波又是一难点。延时继电器的使用起到了关健中的关健作用。