| 摘要 |
The invention relates to a measuring instrument and a method for the optical measurement of the velocity and direction of particles or other objects, in particular in an eye, comprising a spatially coherent light source, optical devices for focusing light from this towards the particle, optical devices for collecting the light scattered from said particle and directing the collected scattered light on a detector. The optical devices comprise an interferometer arrangement having a reference arm and a measuring arm. The detector is divided in at least three parts for measuring light scattered by the particle in different directions, and the instrument and method is adapted to use the signal from the detectors to obtain the phase or frequency shift of the detected signal in order to estimate the velocity of the particle in more than one dimension.
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