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US 5,852,292 AGranted
Method of operating an optical light sensor
AssigneeSick AG
InventorsThomas Blumcke, Jurgen Burger, Fritz Kuhn, Klaus-Jurgen Leiting
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AssigneeSick AG
InventorsThomas Blumcke, Jurgen Burger, Fritz Kuhn, Klaus-Jurgen Leiting
Estimating the term…
A method for operating an optical light sensor for the detection of objects present in the monitored region in which light signals are transmitted into the monitored region in specific time intervals. The transmitted light signals and also the interference signals which occur are received and are evaluated for the detection of objects present in the monitored region, with the transmission reception of the light signals, and also the reception of the interference signals, respectively taking place in time sequential frame intervals. In the absence of an interference signal within a frame interval the transmission of the light signal takes place at the end of the frame interval defining a normed transmission timepoint for the respective light signal. On the occurrence of an interference signal within a frame interval the transmission of the next light signal is delayed timewise relative to its normed transmission timepoint. Furthermore a light sensor of this kind is described.
A method of operating an optical light sensor to detect objects present in a monitored region wherein light signals are transmitted at specific time intervals into the monitored region, the transmitted light signals and also any arising interference signals are received and are evaluated to detect objects present in the monitored region, with the transmission and reception of the light signals and also the reception of the interference signals respectively taking place in frame intervals which follow one another timewise, wherein in the absence of an interference signal within a frame interval the transmission of the light signal takes place at the end of the frame interval defining a normed transmission timepoint of the respective light signal, and wherein on the occurrence of an interference signal within a frame interval the transmission of the next light signal is delayed timewise relative to its normed transmission timepoint.
An optical light sensor for the detection of objects present in a monitored region comprising a light transmitter for the transmission of light signals in specific time intervals, a light receiver for receiving the transmitted light signals and also any occurring interference signals, an object signal evaluation unit for evaluating the received signals during the duration of the transmission of the light signal and for producing an object detection signal if an object is located in the monitored region, an interference signal unit for evaluating the received interference signal in the time interval between two sequentially transmitted light signals and for controlling the light transmitter, with the interference signal evaluation unit including a counter for at least one of determining the length of the negative halfwaves of an alternating interference signal or for generating a control signal for the transmission of a light signal by the light transmitter on reaching a specific count after the occurrence of a once-only-interference signal.
Dependencies are inferred from the claim text.