Abstract
The localised measurement of highly transient pressure sequences at hardly accessible regions within hydraulic systems is a profund measurement problem. This diploma-thesis researches the idea of injecting a small gas-bubble at the point of interest within the liquid and evaluate its pressure dependent diameter optically. Therefore different ways of injecting bubbles are investigated and a thermodynamic model of the bubble is developed to identify influence of disturbance variables such as surface tension. For evaluating the diameter of the bubble fourier-optics is particularly suitable. The research of the influence of a spherical phase object to coherent light is the basis for the construction of the optical configuration and image processing algorithms. A measurment configuration is being created for gauging bubbles of different diameter under various pressure. Selected measurement results are presented to demonstrate the realizability of the presented approach.
| Translated title of the contribution | A fourier-optical method to evaluate the diameter of spherical phase objects for the contactless measurement of transient pressure sequences in liquids |
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| Original language | German (Austria) |
| Publication status | Published - Jan 2007 |
Fields of science
- 202012 Electrical measurement technology
- 202024 Laser technology
- 202037 Signal processing
- 203016 Measurement engineering
JKU Focus areas
- Mechatronics and Information Processing