| 单词 | Ultra low frequency |
| 释义 |
Ultra low frequency
中文百科
特低频特低频（ULF, Ultra Low Frequency）是指频带由300Hz到3000Hz的无线电波。通常于矿场内使用，也可以作勘探地质和地震用。 无线电波名 极低频 超低频 特低频 甚低频 低频
英语百科
Ultra low frequency 特低频Ultra low frequency (ULF) is the ITU designation for the frequency range of electromagnetic waves between 300 hertz and 3 kilohertz. In magnetosphere science and seismology, alternative definitions are usually given, including ranges from 1 mHz to 100 Hz, 1 mHz to 1 Hz, 10 mHz to 10 Hz. Frequencies above 3 Hz in atmosphere science are usually assigned to the ELF range. |
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