Locating and detecting device comprising a plurality of photodiodes

1. A detection and locating device comprising a plurality of optical sensors having fields that together define the field of the detection and locating device, each sensor having a plurality of photodiodes having fields that together define the field of the sensor, the sensors being connected to a control unit in such a manner that each sensor supplies a first signal corresponding to the sum of the signals from at least two of the photodiodes, the first signal corresponding to the sum of the signals from all of the photodiodes minus one, and each sensor supplies a second signal formed by the signal from the photodiode not taken into account for forming the first signal

wherein the control unit ( 10 ) is arranged to subtract the second signal of each sensor (Q 1 , Q 2 , Q 3 , Q 4 ) from its first signal.

2. The device according to claim 1 , wherein the control unit is arranged to sum the first and second signals of each sensor.

3. A The device according to claim 1 , wherein the photodiodes that produce the first signal are connected to one another in permanent manner.

4. A The device according to claim 1 , wherein the photodiodes of each sensor are connected to one another by switches in such a manner as to be able to connect any of the photodiodes together, and the switches are connected to the control unit so as to be controlled thereby.

5. The device according to claim 4 , wherein the control unit is arranged to control the switches in such a manner as to change the photodiodes that supply the first signal.

6. The device according to claim 4 , wherein the control unit is arranged to change the photodiodes periodically in permutation and to filter the measurements obtained.

7. The device according to claim 1 , wherein the photodiodes are four in number for each sensor.