Single-camera Doppler global velocimetry based on frequency modulation techniques |
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Authors: | Harald Müller Michael Eggert Jürgen Czarske Lars Büttner Andreas Fischer |
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Institution: | 1. Department Gas Flow 1.4, Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany 2. Department of Electrical Engineering and Information Technology, TU Dresden, Helmholtzstra?e 18, 01069, Dresden, Germany
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Abstract: | The main advantage of the described Doppler global velocimeter (DGV) systems based on frequency modulation (FM) or frequency
shift keying (FSK) is that no reference detector is required. The frequency variation of the laser light during one modulation
period additionally allows an on-line calibration of the complete DGV system. Thus, the new method has the potential to reduce
the uncertainty of conventional DGV velocity measurements since time resolved velocity field measurements on a spinning disc
have shown standard deviations down to 0.02 m/s. On investigating flow fields, velocity components notably less than 0.5 m/s
were resolved. |
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Keywords: | |
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