Mach–Zehnder Shearing Holographic Interferometry and Its Applications in Aerodynamics
4.1 Problems of Application of Interference Techniques in Gas Dynamic Research
Optical interferometry, with a laser as the light source, has been used as a diagnostic tool in fluid dynamic research for longer than 40 years. However, the gas dynamic flows that could be addressed with such an approach were restricted due to numerical engineering problems, mainly because of the extreme sensitivity of reference beam optical schemes to vibrations during the run of an aerodynamic facility, and excessive expanses involved in large-aperture interference systems. Thus, the two challenging problems that must be addressed before designing interferometric optical ...
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