Opened 2 years ago

Last modified 21 months ago

#614 new task

Owl Calibration 2017 — at Version 5

Reported by: lah Owned by: lah
Priority: immediate Milestone: The Glorious Future
Component: ARSF Keywords: owl, calibration, wavelength
Cc: Other processors:

Description (last modified by lah)

This ticket records the results from the Owl wavelength calibration in 2017. This is the first time this has been attempted and the scripts used are still experimental/ not yet reviewed, but a record is still very useful.

Data location: /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Raw/19.04.17/wavelength

The process uses the raw data to calculate a transmission spectrum which is then compared to that measured by FSF instruments (a wiki page has been prepared in /users/rsg/arsf/scratch_space/wiki_text_DELETE_AFTER_BECOMES_LIVE/Owl_Wavelength_Calibration.docx).

Change History (5)

comment:1 Changed 2 years ago by lah

The script used (and developed) is: calc_owl_wavelength_offset.py in the owl subdirectory of libarsfcal

comment:2 Changed 2 years ago by lah

Multiple files were collected at different integration times, but there are only 2 complete measurements of the same sample. The commands used were:

calc_owl_wavelength_offset.py -r /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Raw/19.04.17/wavelength/Wavelength_80_Ref_Int1_00_2017-04-19_13-38-30/capture/Wavelength_80_Ref_Int1_00_2017-04-19_13-38-30.raw -s /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Raw/19.04.17/wavelength/Wavelength_80_PP_Filter_Int1_00_2017-04-19_13-48-37/capture/Wavelength_80_PP_Filter_Int1_00_2017-04-19_13-48-37.raw -c /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Raw/19.04.17/wavelength/Wavelength_80_Black_Int1_00_2017-04-19_13-51-16/capture/Wavelength_80_Black_Int1_00_2017-04-19_13-51-16.raw -e -t /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Docs/plasticTruthFSF.txt -o ~/scratch_network/transfer/Ttests/

calc_owl_wavelength_offset.py -r /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Raw/19.04.17/wavelength/Wavelength_80_Ref_Int1_10_2017-04-19_14-06-48/capture/Wavelength_80_Ref_Int1_10_2017-04-19_14-06-48.raw -s /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Raw/19.04.17/wavelength/Wavelength_80_PPsample_Int1_10_2017-04-19_14-08-46/capture/Wavelength_80_PPsample_Int1_10_2017-04-19_14-08-46.raw -c /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Raw/19.04.17/wavelength/Wavelength_80_Black_Int1_10_2017-04-19_14-10-38/capture/Wavelength_80_Black_Int1_10_2017-04-19_14-10-38.raw -e -t /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Docs/plasticTruthFSF.txt -o ~/scratch_network/transfer/Ttests/

Last edited 22 months ago by lah (previous) (diff)

comment:3 Changed 2 years ago by lah

The results were:
PP_Filter: rms = 0.024, offset 6.836 nm
PPsample: rms = 0.027, offset 0.610 nm

Given the difference between the 2 measurements the offset measurement is not conclusive.

Manual inspection of the peak values suggests that fityk is correctly identifying the peaks and that the algorithm is working properly, so the difference may just be due to the spectral resolution of the Owl (50 nm).

More measurements should be taken in future for comparison, but with such small values compared to the spectral resolution, the wavelength shift is not currently of major concern.

comment:4 Changed 2 years ago by lah

The output files have been stored here: /users/rsg/arsf/arsf_data/2017/misc/Owl_post_BB_cal_Apr/Processed/wavelength_transmittance

comment:5 Changed 2 years ago by lah

  • Description modified (diff)
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