Verification at MPIA

Functionality

• Goal: Swing in/out, stop motion, etc.
• Operate and move system from engineering interface for all test cases (ARGOS-MPIA-VER-ELE-001-Swing Arm Controller)

Result

• 26.05.2011 finally implemented and verified (Documentation to be updated ARGOS-MPIA-VER-ELE-001-Swing Arm Controller)
• 11.07.2011 last tests with DX before shipping showed some software bugs to be fixed.

Repeatability

• Goal: Catch target position (+- 1mm radius, 1\x92 tilt) and keep over time (<10 micron)
• Measured with PSD system and dial gauge

Result

• 26.05.2011 verified, documentation:
• Positioning of the swing arm

Alignment

• Goal: Control position and tip tilt alignment to the needed accuracy
• Measurement with laser tracker
• Rough alignment of position angle (y) with end stop
  • 1mm@endstop = 7.2mm@position
  • mm@endstop = (rel pos [mm] - x-rot [mm])/7.2
  • 10 plates with thickness difference of 0.1mm
  • 3 plates with thickness of 1mm
• Rough alignment of length (x) with dial gauge on upper spindle
  • 1mm = 1mm in length
  • nominal value 4325mm
  • nominal distance upper spindle = 69.5mm
  • nominal distance lower spindle = 71.234mm
• Rough alignment of tilt (y-rotation) with dial gauge on lower spindle
  • 1mm@spindle = 15.29'
  • mm@spindle = rel angle ['] * 0.0654 + x
• Rough alignment of tip (x-rotation) with calibration unit holder prism
  • 1mm@prism = 23.256'
  • mm@prism = rel angle ['] * 0.043
• Rough alignment of focus (z) with focus screw on calibration unit holder
  • 1mm = 1mm in height
• Fine alignment with ASM hexapod and optical feddback (not tested @ MPIA)
• Accuracy for alignment (tilt angle defined by lower spindle with x/226,248 radians)
  • 1 turn@spindle = 3mm
  • 1/2 turn@spindle = 1.5mm
  • 1/4 turn@spindle = 0.75mm
  • 10 deg@spindle = 0.0833mm = 76.386"
  • 5 deg@spindle = 0.0415mm = 38.193"
• Range for alignment in lower spindle
  • 1.75 turns = 5.25mm = 1.337 deg

Result

• 29.07.2011 verification with laser tracker. Adjustment within two iterations possible (<1mm, <1')
• The measurements are described in: ARGOS Gusset plate alignment
• (detailed measurement list to come).
• Measurement correlation between turns on upper screw and distance between T-Gusset and arm measured at the upper screw Measurement_upper_screw.pdf
• Measurement correlation between turns on lower screw and distance between T-Gusset and arm measured at the lower screw Measurement_lower_screw.pdf

Vibration

• Goal: Understand mechanical gain of the swing arm
• Introduce vibration with shaker and measure at mount and at swing arm end with accelerometer. In such way one can get the transfer function.

Result

• 26.05.2011 not possible as the mounting structure is to stiff and one would have to shake the full building (Description and pictures to come).
• Vibration spectrum of the swing arm first test measurement
• 50 Hz peak in the x-direction

Fiber throughput

• Goal: Measurement of fiber throughput.

Result

• (Description and pictures to come)

Measurements