TN355 – Determination of thermal expansion coefficient Private content

To assess the thermal expansion coefficient of a sample, the variation in length of this sample, ?L sample, has to be plotted against temperature T. With a non-differential system, the raw expansion curve obtained can be described by the following equation : ?L sample – ?L assembly + drift = f(T)
?L assembly is due to the expansion of the material making up the probe and the sample-holder tube which is not compensated for the length of the sample. The drift term is due to a temperature gradient between the sample-holder and the probe. With an adapted software it is possible to correct the raw data of the two above interfering terms and thus obtain the expansion curve of the sample.

This an extract of our documentation, please register to have access to all documentation.