Oxford MIPAS meeting#54
11 May 04
A number of tests have been performed to characterise the anomalies affecting the MIPAS interferometer. These tests have shown that the differential speed anomaly persists also when using the redundant electronics. This points to a mechanical error source. After completion of further tests this week, operations will resume on side A after completion of analysis. To avoid the initialisation error (in some cases restart after absolute velocity errors results in reaching the launch lock position, and recently it has been difficult to exit from this position), initially the operations will be resumed at a specific, reduced resolution. The ARB team has calculated an optimal value of 40.99% of its current nominal mode resolution, that must be kept identical during all modes (nominal, offset, RGC, WCC, transitory sweeps, etc).In view of the above I ask the level 1 and level 2 project leaders Gaetan and Bruno to re-iterate the workplan (already overdue...) and re-allocate therein the remaining resources to achieve with priority the following objective:
Achieve a reconfiguration of the level 1 and level 2 processor to optimise calibration and product data quality when operating at a resultion reduced to 40.99% of its current value
We need to generate: new level 1 configuration files, new calibration planning, new level 2 configuration files for modified nominal mode.
The activities are to be described prior to execution in:
Please note that this is the top-priority activity, as operations will resume shortly.
- The re-characterisation and recalibration plan, with Gaetan as book captain
- The level2 re-configuration and verification plan, for which I request Bruno, as level 2 project leader, to assign a book captain
Gaetan and Bruno, please provide an update of the workplan by Friday, including resource reassigment and schedule for the finalisation of the plans. I will meet with you both at the ACVE-2.
In more detail, the new operations will resume at a resolution of 62400 fringe counts. this results in a sweep duration of 1.46 seconds. Peter Mosner has calculated that the sweep length will be about 41mm, and that configuration is to be such that slide 1 will move between -21.3 ... +19.7mm, slide 2 will move between -19.7 ... 21.3mm (+0.15mm) ASTRIUM is currently calculating optimal times for the new WCC sequence and the compensation times, allowing us to proceed with generation of CTI's. We will consult QWG members indivitually during the redefinition of CTI values..