The main principle is introduced, and the relationship between speed of sonic wave and media temperature is deduced. The great merits and existing questions of acoustic pyrometry are shown.

介绍了声学测温的基本原理，推导了声波传播速度与介质温度的关系式，阐述了声学测温的巨大优势和存在问题。

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The testing of transmission speed of sonic wave in the gas-liquid two-phase flow indicates that Wood formula can be used to calculate the transmission speed of sonic wave in the two-phase flow.

通过声波在气液两相流中传播速度试验证明，武德近似公式可以用来计算声波在该两相流中的传播速度。

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Thanks to a new LSI drive circuit, autofocus speed of the SSM (Super Sonic Wave Motor) is around four times quicker than before.

ENGADGET: Sony NEX-3N and Alpha A58 unveiled, heading to Europe this spring