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-110 Instrument control development <p>For Arnaud:<br/> implement the dither flat sequence within the spsaitActor.</p> <p>For others:</p> <p>according to past discussion we want to move the fiber by a quarter of fiber spacing (+/-60 microns).<br/> some questions remains regarding the way to do it:<br/> which are the inputs parameters you would like?<br/> meaning: do we have a given dither step and a number of dither flat?<br/> do we want a range and a number of dither flat?</p> <p>do we want to talk in pix? in detector microns? in slit microns?</p> <p>or is it fix, for example a dither flat is 3 images, one without moving the slit and one at +60 and -60 microns?</p> <p>what do you think?</p> INSTRM-110

SpS Dither Flat sequence

Task Minor Done Done arnaud.lefur fmadec Thu, 27 Apr 2017 14:23:00 +0000 Wed, 17 May 2017 11:53:08 +0000 Tue, 9 May 2017 14:37:40 +0000 ics_spsaitActor 0 3 <p>I vote for having two knobs: the spacing between images and the number of positions. In real life I think we will need to iterate a little to get the right numbers.</p> <ul> <li>microns-on-detector is probably best, but microns-at-slit is also fine. The ratio probably comes from the procedure in any case....</li> <li>#positions to the side of center (2 would give 5 positions) lets you not deal with even numbers, but I don't really care.</li> </ul> <p>We had exactly the same opinion. Let's start with two parameters :</p> <ul> <li><b>shift (microns)</b> I will implement microns at slit first, but we'll able to calculate the ratio from the measures and check if it match theory</li> <li><b>nb of positions</b> Get rid of even number (1 gives -&gt; 3, 2 gives -&gt;5 ...)</li> </ul> <p>For instance, with <em>shift=60</em> and <em>nb=2</em> would gives:<br/> <b>-120,-60,0,60,120</b></p> <p>Code has been done and tested. <br/> The shift is in the slit coordinate system for now.</p> <p>The shift can now be specified in</p> <ul> <li>microns in slit coordinates</li> <li>pixels on detector</li> </ul> <p>Merged in 0.8.0</p> Development Rank 0|ii0213: Reviewers fmadec