Intro

Manuals:

• accurange 3000 data sheet     (.pdf)
  
• accurange 3000 users manual (.pdf)

Specs from datasheet/manual

• 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)
  

Measurements: (top)

28apr11: distance measurements vs sample average. (top)

• 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.

20apr11: distance rms vs samples averaged. (top)

• 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

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