Monitoring System Requirements
From GlueXWiki
| Characteristic | LED/fibre | LED/wire |
|---|---|---|
| Dead/alive or on/off | yes | yes |
| Timing check/offset | yes | yes |
| Relative gain check | yes | yes |
| Linearity check | low end (a few times one LED) only | low end (a few times one LED) only |
| Temperature stability | yes, sensors in box | sensors in areal spread? |
| Tower row flashing | yes, multiplexer | yes, multiplexer |
| Simultaneously flash both ends | no solution yet | no solution yet |
| Location of LEDs input | Boxes at outer edge of each module, fibres | LED+board on light guide, LPCM in rack |
| Geometrical constraints | mechanical/fragility/replacement are serious concerns | none; easy to install |
| R&D done | Some, solution not preferred | Extensive, mature solution exists |
| Cost | Not costed | quotation exists (getting stale) |
- Details: Minutes/notes from December 6, 2010
- Comment: Time (and temperature) stability most important.
- Comment: Option of delivering a range of light intensities important (e.g. using various filter settings). Athens: test stability of LEDs at low output (near threshold) to see if this can be used as an additional check point in our monitoring.
- Comment: The flexibility in the use of the LED would be very useful for the start counter.
