In this section you will find updates on the current state of development of the intelligent MHT analysis system. For other results on the dissemination and publication activities please visit the dedicated sections.
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A Peltier Element - Fig.1 - uses the Peltier effect to create a temperature difference of up to 30 degrees Centigrade between
its two sides when the element is connected to a convenient electrical power supply.
Figure 1 - An example of a Peltier Element
For our research project we intend to develop a temperature controled heating plate to be used in a modern MHT analysis tool. We will base our design on a Peltier Element. The established requirements state that the starting temperature for our MHT tool should be in the range of 1 to 10 degrees Centigrade, therefore we must assure that the lower temperature side of the Peltier element is actually below the 1 degree threshold in order to obtain the desired temperatures. At the same time we need to cool down the higher temperature side of the element to a maximum of 25 degrees Centigrade in order to satisfy the 30 degrees temperature difference between the two sides.
We chose for our design different passively and actively cooled radiators as in Fig.2 and Fig.3 but with a constrain on the maximum size of the package.
Figure 2 - Example of coolers used in our experiments
Figure 3 - A high power cooler normally used in extreme microprocessor overclocking applications
Results with the smaller sized coolers in Fig.2 were below our expectations. The lowest temperature reached was of only 8 degrees but when using the larger cooler in Fig.3 we obtained even -7 degrees Centigrade which we consider is more than enough for our application.
The temperature was measured using both a contact senzor - Fig. 4 - attached to a measuring tool as well as using an IR camera - Fig.5. The Peltier element was powered using a variable voltage and constant current power-supply. We also determined that the current-voltage pair for the lowest temperature was of 4A and 10V.
Figure 4 - The setup of the experiment in which we tested the lowest temperature that our 70W Peltier element can reach
Figure 5 - A thermal image of an experiment in which we tried to determine the lowest temperature reached by our Peltier heating plate. Notice the three measuring spots corresponding to the ambiental temperature (spot 3), the lower temperature side of the Peltier element (spot 2) and the higher temperature side of the Peliter element (spot 1)