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High precision temperature-control of a low cost rheometer based on a Realtime-Linux system

Klaus Oppermann

Klaus Oppermann

The company Vialit Asphalt GmbH & Co KG approched the Institute for Measurement Technology to develop a Low Cost Rheometer for viscosity measurement of bitumen. The company started this project in former times, so they had already developed a mechanical prototyp, which should only be adapted in this project. The company also holds a patent on the measuring principle of the prototyp, so this principle had to be maintained. In this thesis the complete electronic part for the rheometer should be developed. The whole project is very complex and it would have taken to much time for only one person, so the project is split into parts. The objective of this particular diploma thesis is development of a temperature-controller. Other objectives are e. g. a displacement-controller.

The feasibility of the project should be demonstrated by a simulation. The complete hard- and software should be developed to guarantee an autonomous operation of the rheometer. The implementation of the software should be under the operating system Realtime-Linux.

(a) 3D view of the sample-holder

(a) 3D view of the sample-holder

(b) Horizontal cut through the middle of the sample.

(b) Horizontal cut through the middle of the sample


Figure 1: Thermal simulation of the sample-holder - as it was delivered by Vialit - at a set temperature of 100 °C.
As one can see there is an unacceptable 6 °C temperature difference point in the bitumen sample.

The circulation of the project work is restricted from July 5, 2007, for a period of 5 years.

July 2007