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Optical distance measurement device with calibration device to take cross-talk into account

  • US 9,791,559 B2
  • Filed: 03/19/2013
  • Issued: 10/17/2017
  • Est. Priority Date: 05/18/2012
  • Status: Active Grant
First Claim
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1. A measurement device for measuring an optical distance of an object, the measurement device comprising:

  • an emission device configured to emit a first optical signal towards the object, the emission device being configured to operate with a first power level during a calibration process, the first power level being lower than a second power level used during optical distance measurement;

    a modulator device configured to modulate the first optical signal during the calibration process and during optical distance measurement;

    a reception device configured to detect a second optical signal, the second optical signal including an optical background radiation component and a measurement radiation component, the measurement radiation component resulting from the first optical signal being reflected from the object, the measurement radiation component receiving substantially no detectable signal when the emission device is operated at the first power level that is below a power threshold value during the calibration process;

    an analysis device configured to, at least during optical distance measurement, receive and analyze the second optical signal to determine an optical distance of the object; and

    a calibration device configured to calibrate the measurement device by determining a systematic error with reference to the second optical signal received during the calibration process.

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