| 摘要 |
A sensor (200, 300, 400) for the measurement of distances or of distance changes in accordance with the signal transit time principle having a transmitter (12) for the transmission of an electromagnetic signal as well as having a transmission controller (18, 20) by means of which the signals can be transmitted by the transmitter (12) at presettable transmission times and having a receiver (16) for the reception of the signal remitted in a monitored zone, wherein an evaluation unit (18, 22) of the sensor (200, 300, 400) is made to trigger the transmission of the signal at a transmission time in a respective measurement period (100) and to sample the received signal as well as to accumulate a histogram (110, 114) of such received signals over a plurality of measurement periods (100) to determine the reception time from the histogram (100, 114) and the transit time from said reception time. In this respect, the evaluation unit (18, 22) is made to determine the reception time by an interpolation and thus with a better time resolution than that of the histogram (110, 114) and to preset the transmission times over the plurality of measurement periods (100) in accordance with a distribution such that the time position of the reception time varies within the histogram (110, 114) over the plurality of measurement periods (100).
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