Phase 1 - stand-by phase aiming at attainment and maintenance of lasers' readiness condition to perform measurement (stabilization of their temperature).
Phase 2 - measurement proper (PIV frames acquisition) and measurement of object position
Phase 3 - transition to stand-by condition before next measurement.
Phase 2 (measurement proper), differing significantly from phase 1 (stand-by), has to begin immediately after receiving the external start pulse. Because the time of this pulse arrival is unpredictable, the usage of standard sequencer is not possible, as there is no time for its indispensable reprogramming (timing change).
In order to solve this problem, a new stationary double sequencer has been developed, making it possible to change the generated sequence of very short time impulses (within nanoseconds) in response to received external start pulse.
This system relies on application of two standard V5.1 EURO sequencer modules, and the additional newly developed HSD-MUX-V10-PD multiplexer module, switching their outputs. All the modules, together with a special power feeder, have been located in 19" common casing appropriate for development into 19" rack.