Difference between revisions of "Monitoring System Requirements"
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| Line 11: | Line 11: | ||
| Linearity check || low end (a few times one LED) only || low end (a few times one LED) only | | 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? | + | | Temperature stability || yes, sensors in box|| <font color=orange> sensors in areal spread?</font> |
|- | |- | ||
| Tower row flashing || yes, multiplexer || yes, multiplexer | | Tower row flashing || yes, multiplexer || yes, multiplexer | ||
| Line 19: | Line 19: | ||
| Location of LEDs input || Boxes at outer edge of each module, fibres || LED+board on light guide, LPCM in rack | | 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 | + | | Geometrical constraints || <font color=red> mechanical/fragility/replacement are serious concerns</font> || none; easy to install |
|- | |- | ||
| R&D done || Some, solution not preferred || <font color=green> Extensive, mature solution exists</font> | | R&D done || Some, solution not preferred || <font color=green> Extensive, mature solution exists</font> | ||
|- | |- | ||
| − | | Cost || Not costed || quotation exists (getting stale) | + | | Cost || Not costed || <font color=green> quotation exists (getting stale)</font> |
|} | |} | ||
Revision as of 18:02, 8 December 2010
| 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) |
- Comment: Time (and temperature) stability most important.
- Comment: Option of delivering a range of light intensities important (e.g. using various filter settings).
- Comment from Werner: The flexibility in the use of the LED would be very useful for the start counter. Christina: Still need to test stability.
- Questions to Matt: What uniformity could one expect from the plexiglass input system? How many fibers were used to pulse the plexiglass, i.e. how often were they spaced?
- Comment: Matt drew attention to an LED pulser by Paul Smith which might be a useful reference.
