| 摘要 |
<p>Background elimination device (1), comprising a photoemitter (3), which can emit light pulses in a pre-determined direction, an optoelectronic photoreceiver (4), which can receive light pulses reflected by an object (2), in order to supply as output a pair of position signals, which indicate the distance of the object (2) from the background elimination device (1), a pair of amplification channels (14, 15), which can amplify the pair of position signals, and a processing unit (6), which can receive the said position signals from the photoreceiver (4), via the amplification channels (14, 15), in order, according to the pair of position signals, to supply as output an information signal, which indicates the presence/absence of an object (2), within a pre-determined interval of distances; the background elimination device (1) comprising a sensing circuit (22), which can process temporarily at least one of the position signals, in order to supply as output a signal which indicates the presence/absence of an object (2). <IMAGE></p> |
