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Create watcher alarm using Rotator telemetry to track high amplitude vibrations in phase 1

Description

This action item is in response to the analysis associated with vibrations on the Top-End Assembly (TEA).
We need to implement a Watcher alarm to detect high amplitude vibrations on the TEA before leaving the rotator on for tests, as we did before. We want this alarm to monitor the Rotator telemetry for this particular ticket.

We still need to define exactly what would be the threshold to trigger the alarm.
This might require further data analysis (https://rubinobs.atlassian.net/browse/SITCOM-1285#icft=SITCOM-1285).

Use https://ts-watcher.lsst.io/ to implement a new watcher.

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2
  • 19 Jul 2024, 02:39 PM
  • 19 Jul 2024, 02:39 PM

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Bruno Quint August 19, 2024 at 6:19 PM

I believe we are good to go. Te-Wei explained the strategy for the filter using a Jupyter Notebook, which seems reasonable. In principle, we do not need to implement this during a slew. However, Te-Wei says it is always easier to have a filter active. The criteria to decide whether or not it triggers a warning can be determined after the vibration event is implemented. This will require tests to hone the configuration parameters.

Te-Wei Tsai August 13, 2024 at 7:21 PM

If the proposal is accepted, the implementation will happen in https://rubinobs.atlassian.net/browse/DM-45758.

Te-Wei Tsai August 13, 2024 at 7:17 PM

Please help to review the current experiment of algorithm here:
https://github.com/lsst-ts/ts_notebooks/pull/119

Thanks!

Te-Wei Tsai August 9, 2024 at 8:59 PM
Edited

To differentiate the frequencies of 0.12 Hz and 0.65 Hz while the rotator is stalled, if the sampling frequency is 20 Hz (CSC level), the number of sampling point to FFT should be >= 1024. If the sampling frequency is 2000 Hz (low-level controller level), the number of sampling points to FFT should be >= 32768.

Te-Wei Tsai July 23, 2024 at 5:26 PM

Andy suggested to add the detection at the rotator side. Will develop the algorithm in this direction.

Done
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Bruno Quint

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RubinTeam

Telescope and Site

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Created July 17, 2024 at 2:20 PM
Updated August 19, 2024 at 6:24 PM
Resolved August 19, 2024 at 6:24 PM