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TDC BIN length calculation

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iliasam edited this page Dec 18, 2023 · 1 revision

TDC BIN length can vary from IC to IC.
In my firmware there is no automatic TDC BIN length calibration (TDC can do it), so user must set it manually.
You can set and see TDC BIN length value in LidarTestingUtility, see "BIN Length" value. For accurate measuring TDC BIN length you need to:

  • Use LidarTestingUtility
  • Do Walk error calibration or load calibration data to the LidarTestingUtility
  • Enable "Auto Request Batch" switch
  • Ensure that "CORR. START" values are not "-1", which mean that calibration is applied
  • Ensure that "Corr AVR TOF" values is stable.
  • Do distance measurements at 2-3 different distances, write down real distance value and corresponding "Corr AVR TOF" value.
  • You can just calculate difference in distances and measured BINs values, and divide one diff. to another one:
    (2567mm-1406mm)/(211,4BIN-131,6BIN)=14.5mm/BIN
  • From other side, you can load your measurements to some math software, like SciDAVis, plot graph, do linear fit and see line slope coefficient: image
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