- 2 mrad diverenge 90% reflactance white targest .5 to 300 m
- accuracy:
- +/- 20mm at 100 hz
- +/- 60mm at 2000hz
- resolution: 1 mm
- Laser (2 mrad version).

- 905 nm, Qmax=165 nJ, t=6 ns f=2khz (measurement laser)

- 635nm Pmax=1 mw CW (guide laser)

20apr11: distance rms vs samples averaged

06apr11: Rfi testing in screen room

- data taken : 17 to 18 hours ast
- az=270, dome=5 degrees/
- tiedowns turned off.
- Sample freq - 2000 Hz
- Sample averages: 200,500, 1000, 3000 (.1sec,.25 sec, .5 sec, 1.5 sec averages)
- take 2 minutes of data at each sample average.

- Page 1: accurange 3000 distance vs time for 4 sample averages.
- The rms is included in each title
- Page 2: rms vs sample average and old distomat measurements:
- top: accurange 3000 rms (in mm) vs counts.
- The black line shows the 4 measurements
- The red line is the expected rms vs counts assuming rms for 200 counts is correct
- The rms decreases with counts, but not as rapidly as expected. This is probably caused by slow variations in the measured distance by the accurange3000.
- Bottom: Measured distance with old distomats.
- black,red green are the distances measured by the old distomats. The median value has been removed. corner 12 (black) is the same distance measure the accurange3000
- These measurements were made once every 2 minutes (spending
about 6 seconds for each measurement).

- The maxium variation over 1 hour was 8 mm. For each 2 minute measurement if varied by about 2 mm. This is much more than the 18 to 37 mm rms of the accurange 3000.
- Page 3: return power measured by accurange 3000
- each frame is a different sample average.
- Page 4: plot disance measurement vs returned power.
- The returned power is strongly correlated with the distance measured.
- You would expect the returned power to decrease with increaesed distance unless there was some pointing issue.
- Page 5: accurange 3000 temperate during measurements.
- the temperature measured for each measurent is plotted. there is no obvious dependencies.

- the measued rms for various sample averages is larger than expected (1 mm).
- The measured distance is positively correlated with the distance measured. There is probably some kind of alignement problem betweeen the distomat and the retroreflector.

Jorge ran the distomat at various settings while recording. The setups were:

samples
Averaged |
Measurement
frequency (Hz) |

1 |
1 |

1000 |
1000 |

3000 |
2000 |

15000 |
1000 |

30000 |
2000 |

The rms was computed for each of the sets of distance measurements.

The plots show the results of the distance measurements (.ps) (.pdf):

- Page 1: distance measurements vs time for:
- avg 1, sample 1 hz
- avg 1000, sample 1khz
- avg 3000 sample 2khz
- avg 15000 sample 1khz
- avg 30000 sample 1 kzh
- The rms (in mm) is included in each title.
- Page 2: rms (in mm) vs samples averaged.
- The x,y scales are log.
- The rms does not continue to decrease as the number of integrations increases

processing: x101/110426/accurange3000_data.pro