Measurements of turbulence by laser system with the hybrid fiber-optic sensor

摘要

The operation of the laser system for turbulence diagnostics with the hybrid fiber-optic sensor (HYFOS) in a mode of the digital photographic recording of the 2-D accumulated signal is investigated. The accumulated signal allows obtaining direct estimations of 2-D turbulent fluctuation probability density functions defining processes of turbulent transport. The effective velocity range may be adjusted widely by change of the geometrical and physical properties of the sensitive fiber optic unit. The results of computer simulation and test measurements in an air turbulent jet and the comparison with LDA measurements as well as considerations for ambiguity and transfer function of the sensor are given.