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/PIPE2D-465 DRP 2-D Pipeline <p>Jim has asked me to estimate FWHM of the spectrograph in low and medium resolution mode. Few wavelengths across the detector would be beneficial. He says that FWHM are good enough, he can then do resolution calculation.</p> <p>This is my understanding, the issue was also discussed on telecons on October 16, so there is possibility I missed something (<a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=hassan" class="user-hover" rel="hassan">hassan</a>?).</p> PIPE2D-465

Estimate resolution of the spectrograph

Task Normal Done Done ncaplar ncaplar Wed, 16 Oct 2019 17:45:39 +0000 Thu, 17 Oct 2019 17:59:34 +0000 Thu, 17 Oct 2019 16:46:58 +0000 Fri, 18 Oct 2019 00:00:00 +0900 0 2 <p>This task was raised during the MNG1 telecon on 2019-10-15 and briefly during the SpS telecon today 2019-10-16.</p> <p>This work is related to checking requirement SPS-REQ-42 of document LAM-PFS-RAO-1001 (<a href="https://pfs.ipmu.jp/internal/webdav/tech/SpS/Document_Project_LAM-Mirror/LAM/00_SpSystem/Top-Level_Documents/LAM-PFS-RAO-1001_3.1_FPRD_Signed.pdf" class="external-link" rel="nofollow">https://pfs.ipmu.jp/internal/webdav/tech/SpS/Document_Project_LAM-Mirror/LAM/00_SpSystem/Top-Level_Documents/LAM-PFS-RAO-1001_3.1_FPRD_Signed.pdf</a>)</p> <p>Images used for the analysis are, according to their expId. (see <a href="https://people.lam.fr/madec.fabrice/pfs/ait_logbook_SM1.html):" class="external-link" rel="nofollow">https://people.lam.fr/madec.fabrice/pfs/ait_logbook_SM1.html):</a></p> <p>1250 (blue, Neon)</p> <p>1340(low res, red Hgar)</p> <p>1343(low res, blue HgAr)</p> <p>1362(mid res, HgAR)</p> <p> </p> <p>Care was taken to assure that position of the detector is the same for mid-res and red arm of low-res images. I used images dithered by 0.5 pixel.</p> <p>FWHM_final shows the measured FWHM from dithered images. I see no obvious trend with wavelength and the result are consistent with the fixed PSF size, dominated by the influence of fiber (as expected).</p> <p>Resolving_power_final shows deduced resolving power. </p> <p> </p> <p>To summarize the results in few numbers I quote median FWHM measurements for each setup and the deduced resolving power in the middle of the wavelength range for each setup.</p> <p> </p> <p>mean FWHM blue: 3.12 +-0.06 pixels<br/> mean FWHM low-res red: 3.12 +- 0.13 pixels<br/> mean FWHM mid-res red: 3.44 +- 0.11 pixels</p> <p> </p> <p>Resolving power blue at 515nm = 2492+-48</p> <p>Resolving power low-res red at 800nm = 2983+-120</p> <p>Resolving power mid-res red at 797.5nm = 5398+-180</p> <p> </p> <p> </p> <p> </p> <p> </p> Development Rank 0|zyi01c: Reviewers hassan Story Points 2.0