https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 https://pfspipe.ipmu.jp/jira/browse/INSTRM-1551 Instrument control development <p>When running the code offline to test the fibre identification, there appears to be an instability in the coordinate transformations, which causes issue in the calculation of cobra patrol regions.  Below are examples from the sequence starting with frame 7209200, showing the transformed position of a non-moving cobra over a sequence of frames. The transformation is stable for most frames, but shows scatter in some frames, at up to a 0.6 mm scale. In addition, there is an offset of a few tens of mm between the transformed position and the true position of the fiducial fibres. </p> <p> </p> <p>In addition, the production version of the code (6.1.3) produces different results than the version in the master branch on github, with the former being better. </p> INSTRM-1551

Issue PFI-MCS coordinate transformations on bench

Task Normal Done Done karr karr EngRun Wed, 16 Mar 2022 09:20:23 +0000 Thu, 5 May 2022 05:21:38 +0000 Thu, 5 May 2022 05:21:38 +0000 0 2 <p>Follow up checking with Chi-Hung replicated the problem on the real system. We will check the effect of the unstable cobras. </p> <p> </p> <p>Chi-Hung and I have confirmed that we get the same results. Removing unstable fiducial fibres improves the stability of the transform; the offset remains (on order of 0.2 mm). Chi-Hung has found that some sets of data are better than others; I'm exploring this now. </p> <p>The other thing I will check is looking at some of the data from the last engineering run, to see if the on-telescope transformation is better than the on-bench one.</p> <p> </p> <p>@karr will look at the offset issue in the coming week.</p> <p>Additional plots needed and will then close out.</p> <p><span class="image-wrap" style=""><img src="https://pfspipe.ipmu.jp/jira/secure/attachment/15170/15170_transform71424_10.png" style="border: 0px solid black" /></span></p> <p>Example of transformation residuals, above, version 6.1.3, below version 6.1.5</p> <p><span class="image-wrap" style=""><img src="https://pfspipe.ipmu.jp/jira/secure/attachment/15171/15171_v2.png" style="border: 0px solid black" /></span></p> Development Rank 0|02qpkb:i Sprint PreEngRun05 F Story Points 3.0