Thermal mechanical effects Archives

Our article, dealing with a system developped at the LSCE by Mathieu Casado and Samir Kassi, has been published in Applied Physics B journal.

You can find it here:

https://rdcu.be/cHSOj

It is a companion paper to a previous article (Part 1) that puts emphasis on the actual performance achieved by the system.

This study, orignal started in the year 2017, was the reason why we developped thermal modal analysis/thermal-mechanical harmonic capabilities. Without them, we were at a loss when trying to decide wether our design was still lacking stability, and what should/could be removed or added to have a design that is correctly balanced.

As a supplementary material, we have added the principles and formulas outlining the procedures, in the hope that it can be of use to the general opto-mechanics community.

Well, it doesn’t look like much but those two guys on the picture are smiling. And how do we know that? Because they are not wearing a mask! In public! Ah, those were the days …

On this occasion, I presented a simple addition to the modal method for creating compact – though accurate – state space models for mechanical systems submitted to thermal disturbances.

Then, I applied it to a synchrotron light source primary mirror. This is a typical case where the figure of merit (here: slope error) is dominated by the local, quasi-static response (here: bump) which would be grossly underestimated when not including static correction. I also show that the brute-force approach (including hundreds of modes) would very slowly converge to a … very inaccurate value. The presentation can be downloaded here:

2020_02_26_EUSPEN-SIG-169 Download

This abstract is archived on the EUSPEN repository under number 1219030602.

For those interested, you can reach me using the contact form.

Happy model reduction!