Development of a fiber-optic doppler anemometer for bubbly two-phase flows

Fiber optic laser anemometer systems capable of measurements in two phase bubbly flows were developed. These instruments have great potential for use in the many two phase flow research areas associated with nuclear reactors and other power generating systems. Multimode graded index optical fibers were used to transmit both the illuminating light from the laser to the point of measurement, and the scattered light to the photodetector. The use of optical fibes allowed miniaturization of the anemometer and remote measurements from the laser and photodetector. The two optical geometries developed are the prism fiber optic Doppler anemometer and the Dot fiber optic Doppler anemometer.