Optoelectronic sensor
First Claim
1. An optoelectronic sensor (14) having at least one light transmitter (16) for the transmission of light signals (s(t)) into a monitored zone (18) and having at least one light receiver (20) for the reception of light signals, wherein the received light signals (r(t)) are converted into electrical received signals in the light receiver,characterized in thatthe light signals (s(t)) transmitted by the light transmitter (16) are each generated on the basis of an output signal (60) spread in accordance with a frequency spreading technique (spread spectrum) and provided with an offset (22) applied for the generation of a unipolar signal;
- and in that means are provided to automatically measure repeatedly or continuously respective then current interference, to analyze it in the time domain and/or frequency domain; and
to compensate it at least substantially in dependence on the respective result of the interference analysis.
1 Assignment
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Accused Products
Abstract
An optoelectronic sensor includes at least one light transmitter for the transmission of light signals into a monitored zone and at least one light receiver for the reception of transmitted light signals. In this respect, the received light signals are converted into electrical received signals in the light receiver. The light signals transmitted by the light transmitter are each generated on the basis of an output signal spread in accordance with a frequency spreading technique (spread spectrum) and provided with an offset applied for the generation of a unipolar signal. The electrical received signals can be supplied to a high-pass filter in the light receiver. Means for interference suppression are provided to automatically measure repeatedly or continuously respective then current interference; to analyze it in the time domain and/or in the frequency domain; and to compensate it at least substantially in dependence on the respective result of the interference analyses.
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Citations
15 Claims
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1. An optoelectronic sensor (14) having at least one light transmitter (16) for the transmission of light signals (s(t)) into a monitored zone (18) and having at least one light receiver (20) for the reception of light signals, wherein the received light signals (r(t)) are converted into electrical received signals in the light receiver,
characterized in that the light signals (s(t)) transmitted by the light transmitter (16) are each generated on the basis of an output signal (60) spread in accordance with a frequency spreading technique (spread spectrum) and provided with an offset (22) applied for the generation of a unipolar signal; - and in that means are provided to automatically measure repeatedly or continuously respective then current interference, to analyze it in the time domain and/or frequency domain; and
to compensate it at least substantially in dependence on the respective result of the interference analysis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- and in that means are provided to automatically measure repeatedly or continuously respective then current interference, to analyze it in the time domain and/or frequency domain; and
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15. A method for interference suppression with an optoelectronic sensor (14) having at least one light transmitter (16) for the transmission of light signals (s(t)) into a monitored zone (18) and having at least one light receiver (20) for the reception of light signals in which the received light signals (r(t)) are converted into electrical received signals in the light receiver,
characterized in that the light signals (s(t)) transmitted by the light transmitter (16) are each generated on the basis of an output signal (60) spread in accordance with a frequency spreading technique (spread spectrum) and provided with an offset (22) applied for the generation of a unipolar signal; - and in that respective then current interference is measured repeatedly or continuously, is analyzed in the time domain and/or frequency domain; and
is compensated at least substantially in dependence on the respective result of the interference analysis.
- and in that respective then current interference is measured repeatedly or continuously, is analyzed in the time domain and/or frequency domain; and
Specification