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Gas Flow Monitoring in High and Low Reynolds Regimes Based on Compensated FMCW-Radar Phase Measurements

: Hattenhorst, B.; Baer, C.; Musch, T.; Jaeschke, T.; Pohl, N.


Frequenz 71 (2016), Nr.3-4, S.195-205
ISSN: 0016-1136
ISSN: 2191-6349
Fraunhofer FHR ()

In this contribution, a composite measurement concept for the gas flow determination in diverse stream scenarios is presented. The approach utilizes the pressure- and mixing-dependent relative permittivity of gaseous media, which, in case of a vortex or a marker gas, creates a detectable variation in the measuring beam of the radar. Since the measurement effect is very small, phase measurements based on highly precise and low jitter frequency-modulated continuous-wave radar systems in different frequency bands are applied. Moreover, disturbances caused by vibrations of the measurement setup are compensated out of the measurement signal.