|
The more copper the more weight you add, you really just need enough wide to completely cover the back of the sensor, and you can make the outside the right size for your TEC. Don't forget that you need to attach the heatsink/fan combi to the cold finger and sandwich the TEC. I used Artic Silver thermal paste but it can get messy. There are some great thermal pads around now but they cost much more than paste. I used two nylon screws and bolts on either side of the TEC to hold the heatsink onto the finger. I put a nylon lock bolt on each screw as well, you want it solid and unable to move. Don't use metal screws or bolts as they will degrade thermal performance. Don't forget to put your temperature sensor on the cold finger just where it goes behind the sensor, you have to have one in there to be able to do set point cooling control.
Brent i am not a fan of styrofoam in there as it compresses and does not stop cold finger movement. Sure it insulates but the only thing supporting the cold finger in that situation will be the three sensor mount screws and the leverage put on the sensor board by the weight on the cold finger is not good. Imho, a solid spacer, like my carbon fibre one, is preferred to stop finger movement. Really anything could be used that will not absorb condensation or compress. A piece of nylon cutting board machined to fit would be ok.
|