Distance measuring device having homogenizing measurement evaluation
A handheld measuring device for optical distance measurement includes a transmitting device, a receiving device, an evaluation device, and a homogenizing device. The transmitting device is configured to transmit periodically modulated optical measurement radiation toward a target object. The receiving device is configured to detect optical measurement radiation returning from the target object. The evaluation device is configured to receive and evaluate detection signals of the receiving device. The evaluation device comprises a plurality of accumulation devices configured to accumulate detection signals. The evaluation device conducts detection signals during a sampling time window from a plurality of sampling time windows temporally schematically changeably to an assigned accumulation device from the plurality of accumulation devices, such that the accumulation device accumulates the detection signals during the sampling time window.
1. A handheld measuring device for optical distance measurement, comprising:
a transmitting device configured to transmit periodically modulated optical measurement radiation toward a target object;
a receiving device configured to detect optical measurement radiation returning from the target object; and
an evaluation device configured to receive and evaluate detection signals of the receiving device; and
a homogenizing device,
wherein the evaluation device comprises a plurality of accumulation devices configured to accumulate detection signals,
wherein the evaluation device conducts detection signals during a sampling time window from a plurality of sampling time windows temporally schematically changeably to an assigned accumulation device from the plurality of accumulation devices, such that the accumulation device accumulates the detection signals during the sampling time window,
wherein the evaluation device determines a total signal acquired over a total measurement duration from the detection signals accumulated in the accumulation devices, and
wherein said homogenizing device is configured to vary the temporally schematically changeable assignment of accumulation devices from the plurality of accumulation devices to sampling time windows during the total measurement duration.
2. The measuring device as claimed in claim 1 , wherein the homogenizing device varies the schematically changeable assignment in such a way that over the total measurement duration a plurality of the accumulation devices are assigned approximately equally often to each of the sampling time windows.
3. The measuring device as claimed in claim 1 , wherein:
the total measurement duration is subdivided into a plurality of partial measurement durations,
within a partial measurement duration, there is a fixed phase relationship between the periodically modulated measurement radiation and a cyclic assignment of the accumulation devices to sampling time windows, and
between different partial measurement durations, there is a relative phase shift in said phase relationship.
4. The measuring device as claimed in claim 3 , wherein:
between partial measurement durations, there is a relative phase shift of 2π/n, and
n is the number of partial measurement durations.
5. The measuring device as claimed in claim 1 , wherein the temporally schematically changeable assignment of accumulation devices to sampling time windows is synchronized with the modulated measurement radiation.
6. The measuring device as claimed in claim 1 , wherein the number of sampling time windows and the number of accumulation devices are identical.
7. The measuring device as claimed in claim 1 , wherein the number of sampling time windows and the number of accumulation devices are not identical.
8. The measuring device as claimed in claim 1 , wherein a period duration of a cyclically repeating sequence of the number of sampling time windows differs from the period duration of the modulated measurement radiation.
9. The measuring device as claimed in claim 1 , wherein the receiving device comprises at least one SPAD.
10. The measuring device as claimed in claim 1 , wherein the detection signals are conducted from the receiving device to the accumulation devices through multiplexers.