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Termocouple handcraft

Measuring temperature on an isolated sample is quite difficult. One option was to use a pyrometer but it could be problematic to measure through the quartz glass tube in the chamber. The other option is to use thin thermocouples attached on the test specimen. One problem is to insert them through the chamber without resulting … Continue reading “Termocouple handcraft”

Induction heating system

To be able to use the laser extensometer, the heating source must allow the laser to reach the test specimen. This rules out the usage of a radiation furnace since the slit that is needed for the extensometer will not give us a gas-thight chamber. Instead, we are using an induction system (5kW) with an induction … Continue reading “Induction heating system”

Non-contact strain measurement using laser

To measure the strain when the specimen is isolated is something I have put a lot of thinking to. One common method is to put an extensometer on the specimen outside the furnace. This requires long test specimens, which is a limitation and not something we want. We want something that can measure a displacement … Continue reading “Non-contact strain measurement using laser”

Making a heating tube

We now have a flexible gas system but I´m not completely done with this set-up. We can control the moisture content in the gas, but since it is a short distance between the evaporation module and the chamber, there is a risk for condensation. Preheating is therefore necessary. The gas connections have a diameter of … Continue reading “Making a heating tube”

Controlling the test atmosphere

The supply of gases has been solved but we want to be able to control the gas, especially when we run testing in inert environments. The rig has therefore been equipped with an oxygen probe. We decided to measure the oxygen content of the outlet gas in order to rule out gas leakage in the … Continue reading “Controlling the test atmosphere”