[INSTRM-1349] Undo INSTRM-940 flip across Y. Created: 06/Sep/21  Updated: 06/Sep/21  Resolved: 06/Sep/21

Status: Done
Project: Instrument control development
Component/s: hxhal
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Normal
Reporter: cloomis Assignee: cloomis
Resolution: Done Votes: 0
Labels: SPS
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Story Points: 1

 Description   

That was stupid and confusing. Should not have deferred to engineers.

Undo change before NIR data becomes any more public. Added a W_4FMTVR card to signal such changes. Will be 2 after this change.

 Comments   
Comment by cloomis [ 06/Sep/21 ]

Merged at 938ab6a, tagged 3.0.0

Comment by rhl [ 06/Sep/21 ]

Does this mean that the order of fibres L-R will be different on the raw n images than on the br ones? That's OK, but I'd like to be sure.

Please identify visits with correct headers from before and after this change which are visible in Princeton (and anywhere else that might care). I can handle this transparently in the code, but will want to be able to check.

"Handle" probably means apply this unflip to old raw data, and flip new post-ISR data.

Comment by cloomis [ 06/Sep/21 ]

The main physical difference between vis and nir cameras is that dispersion is along rows for the nir cams.

I believe that by undoing the INSTRM-940 flip, the main difference between the vis and nir geometry will be just that: a +/- 90 degree rotation. No other flips, etc. Well, except for the different channel/amp geometries and the fact that there really is only one H4 chip, not two CCDs.

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