Driverless transport system control - uses laser sensor with laser diodes working in push=pull to detect position from retroreflective strips

摘要

Sensors detect a conducting track inside buildings and covered spaces. The drift or the difference between the required and actual values of the signals given by the sensors is used for control purposes. Serving as the conducting track (10), a reflecting strip (11) is fitted to the roof or ceiling of the plant. Each vehicle has a laser beam sensor (12) with two laser diodes (13,14) and a common receiver (30) and single detector (16). This arrangement directs two laser beams (13b,14b), lying close together, on the conducting track and, when there is a deviation from the required position inside the range measured, at least one of the incident surfaces (13a,14a) of the laser beams hits the reflecting strip, the intensity of the signal in the receiver depending on the deviation. ADVANTAGE - High system flexibility with economically strip lying.