[INSTRM-1470] Blue/Red flux ratio lower than expected Created: 06/Dec/21  Updated: 20/Sep/23

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

Type: Task Priority: Normal
Reporter: hassan Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Relates
relates to PIPE2D-918 Provide flux data for calibration lam... Done
relates to PIPE2D-799 Correct for Jacobian when resampling Done
relates to PIPE2D-942 Do we see bright blue spots at double... Done
relates to PIPE2D-943 Blue/red drop in SM2? Done

 Description   

As discussed in the drp-2d channel (messages around https://sumire-pfs.slack.com/archives/C3AU3VCMU/p1636429524093300) the blue:red flux ratio is lower than expected, with the measured flux in the blue arm being roughly a factor of 2-3 lower than expected.

Please investigate as to the cause.

 Comments   
Comment by yuki.moritani [ 20/Sep/23 ]

(For recording)
Intensive discussion and work in September 2023 revealed that vphg has been installed in wrong orientation. This caused blue is much lower than red. 

Given that it turns out  a h/w issue, I'll close this ticket if there is no objection.

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