...
- Scan Amplitude = 2V (or 4V if a differential input is employed). This corresponds approximately to field-of-view scanned using Scan Amplitude = 2.5V (or 5V with differential input) under ScanImage 3.0/3.5.
- For this particular galvo, measured Acquisition Delay = 100?s (Scan Delay = 200?s). These values were entered and held fixed -- i.e. the linear optimization regime was employed. This Scan Delay value is well above small-angle step response specification; a better tuned scanner/servo would likely perform better.
At the specified fill fractions, the temperature remained below 50°C during 1 hour of continuous scanning. The temperature had remained stable for at least 5-10 minutes at that point.
Values are color-coded as follows:
Red: Maximum safe value found (if any) is below the optimal fill fraction value determined for the linear regime . That value is provided (given in parentheses). In this caseother words, thermal considerations are the limiting factor at this speed/amplitude.
Orange: Value represents the optimal fill fraction value determined for the linear regime. At that value, stable temperature was reached in the range of 40-50°C at 1 hr. Higher fill fractions, which would be in the nonlinear regime, were not tested and appear to be at risk of overheating.
Green: Value represents the optimal fill fraction value determined for the linear regime (or 0.819, whichever is lower). At that value, stable temperature was reached below 40°C at 1 hr. Higher fill fractions were not tested, but appear to be possible.
These results, of course, are provided as a reference only. They are in no way a guarantee.
Possibility of using fill fraction values above the optimum for the linear regime only applies for sawtooth scanning.
Sawtooth Scanning
16° 1x | 2x 8° 3x | 5.33° | 4x 4° 5x | 3.2° | ||
|---|---|---|---|---|---|---|
1 ms/line | NONE (0.569554) | NONE (.661621) | 0.569 585 (.683640) |
| 0.621 (.640) | 0.640 |
2 ms/line | 0.706 | 0.759 | 0.787 | 0.819 | 0.819 |
Bidirectional Scanning
| 16° | 1x 8° 2x | 5.33° | 3x 4° 4x | 3.2° | |||
|---|---|---|---|---|---|---|---|---|
0.5 ms/line |
|
|
| NONE (0.640) | NONE (0.640) | 0.706 | 0.706 | 0.706 |
1 ms/line | 0.819 | 0.759 |
|
| 819 | 0.819 | 0.819 | 0.819 |
2 ms/line | 0.819 |
|
| 0.819 | 0.819 | 0.819 | 0.819 |
NOTE: Values above 0.819 were not tested.
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- Temperature measured using Fluke 179 multimeter using Fluke 80BK-A temperature probe (Type-K thermocouple)
- Galvo was mounted on a standard aluminum mounting block (available from Cambridge Technology) which in turn was placed on a stainless steel shelf in a well-ventilated room/area
- Probe was fixed to exposed side of galvo can, towards the mirror, using thermal compound
- Baseline temperature for tests was ?24.5°C
- Optimal fill fraction fulfilling 'linear' condition was determined by eye - i.e. it was judged that ripple had sufficiently settled by the desired ramp start position