Patent ID: 8891068

Claim:
A measuring device for optical distance measurement, in particular a handheld measuring device, comprising: a transmitting unit for emitting periodically modulated optical measurement radiation toward a target object; a receiving unit for detecting optical measurement radiation returning from the target object; an evaluation unit for receiving and evaluating detection signals of the receiving unit; and a calibration unit for calibrating the measuring device, wherein the calibration unit is designed to calibrate the evaluation unit on the basis of a detection of uncorrelated radiation which does not correlate with the modulated measurement radiation emitted by the transmitting unit, wherein a period of the periodically modulated measurement radiation is subdivided into a plurality of subperiods, wherein the evaluation unit is designed to cumulate a detection signal received by the receiving unit over predetermined subperiods, and wherein the calibration unit is designed to calibrate a length of the subperiods on the basis of a detection of unmodulated radiation.