| Autor: |
De La Torre I MH, Frausto-Reyes C, Moreno-H D, Salgado-Transito I |
| Jazyk: |
angličtina |
| Zdroj: |
Applied optics [Appl Opt] 2021 Jul 01; Vol. 60 (19), pp. 5623-5628. |
| DOI: |
10.1364/AO.426158 |
| Abstrakt: |
A digital holographic interferometer using a collimated beam in transmission mode to illuminate a flow coming from a diffusion flame is presented. The optical system proposes an indirect visualization of the flow to avoid saturation at the sensor. It can detect the intensity signal as a classical schlieren technique and the phase changes due to the presence of the flow. It is possible to retrieve a pseudo-3D flow's view and different gradient maps using the optical phase. According to the knife edge's position, these gradients could be observed in classical schlieren one at a time, but the proposed system could retrieve them all with a single image hologram. As proof of principle, a flame's flow is simultaneously observed with the optical system and a Z-type schlieren set up. A comparison of the visualized flows at different stages of the flame is presented and discussed. A temperature profile is obtained and validated with a thermocouple's point thermal measurements taking the resulting optical phase. Results from both optical techniques show a good agreement. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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