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Lugano Thermal Assessment Take 2

Geschrieben von Robert Greenyer am .

Our last and best []=Dog Bone=[] is preparing for another verification of the Lugano report.
In order to resolve some nagging questions in the community and because we are really the only people that are in a position to do this, we are revisiting this controversial area to settle remaining doubts.
Better power analyser and better metrics are in order, same PI160, lens and calibrations as Lugano. All temperatures in ºC
Huge thanks to the team, especially Alan and Skip for agreeing to spend their time doing this. Some set up will need to occur before this happens, but with Brian Albiston's fantastic recent contribution, this is made a lot easier.
Thanks must also again go to Ryan and Paul Hunt at HUG for making the []=dog bone=[] and to BobCat Sweden for paying for the repair to the Optris.
Proposed layout below (the C.xx area has been set to average in the above downloadable layout file)

Reflecting on the original tests and our experience since - a few potential things need to be resolved.
  1. Blocking the ends of the reactor tube rather than having them open as in the case of the first verification
  2. In the first tests, we established by way of the Williamson IR 3mm spot that the average of the top third of the ridges was 100ºC hotter than the same span in the crevice. This meant that the K-Type and B-Type TCs, which had end beads of differing sizes, read slightly differently in the original tests.
  3. The original TCs were held in place by fine Kathal wire and so were partially in convective flow - in this case they are bonded to the surface, leveraging the TC bonding experience we have gained since.
In this test, the high emissivity paint (1 at 800ºC) is in a flat area and the comparative adjascent alumina has been flattened also - this should remove the ridge/crevice issue from the original tests and provide a bullet proof calibration as per the Optris manual.

More details and a quick RAVI (Radio Metric AVI) file to download so you can learn to play with the set-up

If you have a windows PC, you can download the free Optris PI-Connect, load the sample RAVI from the set up and import the Layout - with this, you can play with the regions and emissivity to your hearts content and be ready for a similar file we intend to share after the main test.

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