Time-of-flight sensor and monitoring system comprising such a sensor

摘要

The invention relates to a time-of-flight sensor (10) comprising: an illumination device (11) comprising a light source (12) emitting a source beam (13) towards a scene (3) comprising an object (4) capable of reflecting the source beam; a detector (15) comprising a matrix (16) of photosensitive pixels (16A) receiving a part (18) of the source beam reflected by the object; and an electronic unit (19) configured to: generate a modulation signal and control the device by means of this signal so that the source beam has a temporally modulated source light power; process electrical signals delivered as a function of time by the detector, each electrical signal being representative of a fraction of the source light power reflected towards a pixel; and deduce from the electrical signals, a characteristic distance (Dobj) between the object and the device. According to the invention, the unit is configured to, when the object is detected as being at a characteristic distance less than a predetermined threshold distance, to control the device so as to reduce the source light power on average. Figure 2