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RPI20 parallel interface

The RLE system directly produces a 1 Vpp sine / cosine output with nominal signal periods of 316 nm and 158 nm from single and double pass interferometers respectively.

The RPI20 interface processes these signals to provide ultra-high resolution (4096x interpolation) positional feedback in parallel word format.

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Features and benefits

  • 4096x interpolationDual axis VME
  • Analogue input bandwidth of <6.5 MHz
  • 36-bit parallel format output
  • Up to seven axis capability on one bus
  • Switch selectable output resolutions
  • Addressable registers providing:
    • Position data
    • Card status, inlcluding Liassajous co-ordinates, laser signal strength and system status
  • Compact 110 mm x 72 mm board size
  • Optional dual axis VME host board to enable to the RPI20 to be used in VME system architectures

Specification

Resolution38.6 picometres (plane mirror system)
77.2 picometres (retroreflector system)
Maximum velocity1 m/s (plane mirror system)
2 m/s (retroreflector system)
Output signal36-bit parallel word

Documents

Next steps

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