Opened 3 months ago

Last modified 3 months ago

#650 new flight processing

Fenix Calibration, end of season, october 2018

Reported by: asm Owned by:
Priority: immediate Milestone:
Component: Processing: general Keywords:
Cc: Other processors:


This ticket records calibration of the Fenix sensor for the final season. As a memento, the Fenix sensor was repaired by Specim in February 2018 and the detector array was replaced with a new one so timeline comparisons should not be made with calibrations made before 2018

Data location:

Change History (2)

comment:1 Changed 3 months ago by asm

A season final calibration was performed at BAS Cambridge during 17-19 October 2018. Most likely the last NERC-ARF calibration. asm attended to along with Chris from NERC-FSF and Gary from Ops.

  • Collected 3 datasets for Fenix
  • Problems with some Fenix data. The frame counter will go to negative values sometimes! Usually, first flightline data after warming up. The data can be used but has less number of frames.
  • asm wrote a script to compare uniforme versus absolute fenix data (close or far from integrating sphere)
  • asm to test latest changes to librarfscal and get a better tracking with the most up to date files
  • Discussed with Chris the need of uncertainties in report. Chris also trying to get a better documentation of processing procedures.
  • Better documentation for the scripts is also needed so will do that as we process the data.
  • Further characterisation using the double monochromator to be performed during 5 days starting on 29th October. asm to go back to BAS those days.

comment:2 Changed 3 months ago by asm

Wavelength accuracy.

Started at Cambridge, some problems were found and resumed at PML. No Mylar filter used for any of the datasets
-Dataset 1: No peaks found in the SWIR using the Kr lamp. Only one peak found for the 2 available He emissions in the SWIR. No fitting can be done with only one peak.

-Dataset 2: None of the Kr peaks were found in the SWIR, only the 2 peaks for He could be used.

-Dataset 3: The 2 peaks for He and 4 peaks for Kr where found in the SWIR region. This automatically makes this dataset the more trustworthy. Some of the other peaks in the csv file are very close to others not noted in the same file. Their contribution are likely to be mixed as fityk is reporting peaks in between of those values when analyising that lamp data alone. Related to that, there are a few peaks in the VNIR showing large values of FWHM that could be caused for something similar (such as 837.8 that was identified as 837.64 returning a FWHM of 25.15 when it seems that the Ne has one peak at 836.6 and another at 837.8). Since I am going back to the lab at Cambridge next week, I will put further processing on hold and will discuss this issue with Chris. So far the offset for this dataset is: 0.330852 and 0.386719 with respect to the original values of the Specim's calibration (good values)

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