The problem of efficiency evaluation of water jet nozzles has been dealt in the present work and a novel Laser Doppler Velocimetry (LDV) technique has been proposed in order to acquire high-speed water velocity at the exit of the cutting head nozzles. A standard LDV technique has been implemented for the first experimental trials with the aim of applying the theoretical approach to measured velocity values. A novel LDV technique has been proposed outlying of the critical aspects to be taken into account for future developments and improvements in measurement dynamic range, resolution, and accuracy.

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