Michelson spectrometer for instantaneous Doppler velocity measurements

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Abstract
A phase-stabilised Michelson interferometer is used as sensitive spectrometer, generating a continuous electrical signal that follows proportionally and with a mu s time constant the wavelength changes of the Doppler shifted scattered light. Thus a real-time velocity signal is available. The different aspects arising from various applications are discussed, for example high sensitivity for small velocities, high time resolution, cases of low level and discontinuous scattered light. Typical examples are given showing the performance of the system in recording both surface movements and flow velocities.

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