Abstract
The presented paper shows the possibility of digital holographic interferometry application in measurement of unsteady 2D temperature field generated by pulsatile flow which is impinging heated surface. Special holographic setup with double sensitivity was developed instead of the commonly used MachZehnder type of holographic interferometer in order to attain the parameters sufficient for the studied case. This setup is not light efficient like the MachZehnder type but has double sensitivity. The results from the digital holographic interferometry experiments are perfected by measurement of the velocity field achieved by methods of hot-wire anemometry.
Highlights
IntroductionFigure 1: digital holographic setup with double sensitivity (BS-beam splitter, SF-spatial filter, H -hologram, CL - collimating objective, M – mirror, FL-focusing lens, R-reference beam, O-object beam)
The actuator consists of a cavity which is equipped with an emitting slot and a pair of electrodynamically actuating diaphragms running in opposite directions
The velocity profile at different positions z were measured at the center and at both ends (x=±17) of the slot
Summary
Figure 1: digital holographic setup with double sensitivity (BS-beam splitter, SF-spatial filter, H -hologram, CL - collimating objective, M – mirror, FL-focusing lens, R-reference beam, O-object beam). One of the biggest benefits of holographic interferometry over standard interferometry is its differential character This in general means that imperfections in the beam paths do not influence the shape of obtained phase field. The biggest portion of light energy is lost in the beam splitter BS2 (Fig.1)
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