When the surpace of vibration tube appeared ice, the immanence frequency btings excursion, so according to detect the excursion quantity of immanence frequency can confirm the ice state.

• 当振管表面出现结冰时,其轴向固有频率会产生偏移,通过检测轴向固有频率偏移量,即可确定结冰状态。