Abstract
Dynamic interferometric measurement with extended unambiguity range in flow measurement
Highlights
Interferometric methods such as digital holographic interferometry and interferometry are generally understood to belong to the group of most accurate measuring devices [1]
These measurement methods are suitable for stationary phenomena that are quite rare in the fluid mechanics measurement
A key factor is the use of two wavelengths and the recording of interferograms from both wavelengths in one frame
Summary
Interferometric methods such as digital holographic interferometry and interferometry are generally understood to belong to the group of most accurate measuring devices [1]. Two or more interferograms at different wavelength are successively captured and the phase information is combined in order to get higher dynamic range of the measurement. These measurement methods are suitable for stationary phenomena that are quite rare in the fluid mechanics measurement. In this paper we propose a method based on carrier frequency interferometry with simultaneous use of two wavelengths This makes it possible to vary the dynamic range of measurement almost arbitrarily and it is possible to measure in real time phenomena causing large phase changes without the need for a reference gauge
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