New Principle for Fluid Flow Measurement
Abstract: Fluid flow measurement is a task for which many different solutions exist. For high precision sensors the production cost is high and measurement principle is generally based on advanced theory. In this thesis a new principle of fluid flow measurement, based on the concept of a conventional rotameter, is investigated. The new principle uses a solenoid to create a magnetic field to maintain a float, placed in the flow path, at a fixed position. A model is then created to approximate the relation between fluid flow and the current in the solenoid. The principle is, in this thesis, verified as a possible method of measuring fluid flow. A number of properties and disturbances (i.e. pressure, temperature, tilt and air bubbles) are investigated as to see how they affect the measurement principle. In all cases an observable effect has been identified. Most disturbances i.e. pressure, tilt and air bubbles are assumed to be possible to avoid or remove. It is, however, found that there is a need to include a temperature compensation in the model. The new principle is seen as a promising method of measuring fluid flow with simple tools and low costs of manufacturing. There is a need to test the effect of additional parameters and disturbances to verify the reliability of the principle.
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