... 门口 doorway 都卜勒拍频率，都卜勒差频率 Doppler beat frequency 都卜勒频率 Doppler frequency ...
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多普勒拍频
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The Doppler frequency can be obtained as a heterodyne or beat effect.
由于外差或频差效应，能够得到多普勒频率。
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A remote measurement system of solid surface displacement by laser Doppler effect of grating which was used to produce beat frequency is discussed.
研究了利用运动光栅的多普勒效应进行切向位移的遥测技术。
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