| CPC G01V 8/20 (2013.01) | 16 Claims |
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1. A light grid for object detection and for determining a distance between a transmitter strip with at least two transmitter elements for emitting radiation and a receiver strip with at least two receiver elements for receiving radiation from the at least two transmitter elements, the light grid comprising a control device, which is configured to output a signal for object detection during an interruption of the receipt from at least one transmitter element of the at least two transmitter elements,
wherein
at least one transmitter element of the at least two transmitter elements
is configured as a qualified transmitter element designed to emit radiation having at least two different intensity levels,
at least one receiver element of the at least two receiver elements
is configured as a qualified receiver element designed to amplify the intensity resulting from the received radiation with at least two different amplification factors and to ascertain therefrom for each qualified transmitter element an intensity value for the received and amplified intensity,
wherein the control device is configured to
control at least two combinations of intensity levels and/or amplification factors of at least one of the qualified transmitter element or the qualified receiver element,
and to ascertain therefrom a sum of the resulting intensity values of at least two of the controlled combinations,
and to output a distance value as a function of the sum,
wherein the control device is configured to
control the combinations successively in a sequence
and to periodically repeat the sequence
and to ascertain the sum of the controlled combinations of a sequence
and to ascertain a distance value for each sequence.
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