Heterodyne Doppler global velocimetry
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Doppler Global Velocimetry (DGV) is an imaging flow measurement technique which allows the measurement of the velocity distribution in a plane. In DGV the frequency shift of scattered light from moving particles within the flow is used to determine the local flow velocity. Heterodyne Doppler Global Velocimetry (HDGV) is a new approach which combines the imaging and geometrical characteristics of DGV with the measurement principles of reference beam laser Doppler anemometry. The frequency shifted scattered light from the flow tracers is heterodyned with a reference beam from the same light source. Due to interference the result of this superposition is a harmonic intensity modulated signal. This signal is detected using a smart pixel detector array to obtain the velocity distribution. Two different experiments are presented. The first experiment compares the measured velocity distribution of a rotating disk with its actual velocity. The second experiment demonstrates the capability of the technique to measure a real flow.
- Beer S, Seitz P (2005) Real-time tomographic imaging without X-rays: a smart pixel array with massively parallel signal processing for real-time optical coherence tomography performing close to the physical limits. Research in Microelectronics and Electronics 2005 PhD 2:135–138Google Scholar
- Beutner TJ, Elliott GS, Mosedale A, Carter C (1998) Doppler global velocimetry applications in large scale facilities. In: AIAA 20th advanced measurement and ground testing conference, AIAA Paper 98-2608Google Scholar