Method for suppressing an echo signal
View Patent ↗Method for suppressing an echo signal in a range finder device, which has at least one light-sensitive receiver and at least one laser light source as transmitter, characterized in that at least one counter signal corresponding to the echo signal is generated and which counter signal is super-imposed to a signal generated by the transmitter.
1. A method for suppressing an echo signal caused by optical cross talk in a range finder device, which has at least one light-sensitive receiver and at least one laser light source as transmitter, the method comprising:
generating at least one counter signal corresponding to the echo signal caused by optical cross talk; and
super-imposing, in an additive or subtractive way, the at least one counter signal to a signal generated by the receiver, forming a resulting signal.
2. The method according to claim 1 , wherein the resulting signal is intensified.
3. The method according to one of the claim 1 , further comprising a calibrating step, wherein a level and/or a value and/or an amplitude and/or a pulse shape of the at least one counter signal are varied.
4. The method according to claim 3 , wherein the calibrating step is carried out prior to the range finding step.
5. The method according to claim 3 , wherein within the scope of the calibrating step, a signal vector of the resulting signal is analyzed.
6. The method according to claim 3 , wherein the calibrating step is repeated several times.
7. A range finder device having comprising:
at least one light-sensitive receiver; and
at least one laser light source as transmitter;
wherein the range finder device is adapted to generate at least one counter signal corresponding to an echo signal caused by optical cross talk and which the at least one counter signal is super-imposed, in an additive or subtractive way, to a signal generated by the receiver, forming a resulting signal.
8. The range finder device according to claim 7 , wherein it is adapted to intensify the resulting signal.
9. The range finder device according to claim 7 , wherein it is adapted to vary a level and/or a value and/or an amplitude and/or a pulse shape of the at least one counter signal in one calibrating step.
10. The range finder device according to claim 9 , wherein it is adapted to carry out the calibrating step prior to the range finding.
11. The range finder device according to claim 9 , wherein it is adapted to analyze a signal vector of the resulting signal within the scope of the calibrating step.
12. The range finder device according to claim 9 , wherein it is adapted to repeat the calibrating step several times.
13. A far-optical device comprising a range finder device according to claim 7 , with transmitter and receiver being at least partially disposed in one optical path.