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US07397596B2 Surface and subsurface detection sensor 失效
表面和地下检测传感器

Surface and subsurface detection sensor
摘要:
A sensor comprises an optical modulator that generates a modulation signal, an interferometer that mixes an acoustic signal evoked by a pulsed laser with the modulation signal to down-convert the acoustic signal to lower frequencies, and a photodetector that detects the down-converted signal.
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