Laser scanner for monitoring a monitoring region

A laser scanner for monitoring a monitoring region in front of an opening that can be closed by a closing means, the closing means defining a hazard region within the monitoring region, the monitoring region being delimited at least on one side by a frame, the scanner comprising:

• a laser transmitting/receiving unit emitting laser pulses scanning the monitoring region, a propagation time sensing unit which determines a distance to an object in the monitoring region by means of a time of flight measurement (TOF) of the laser pulses, the propagation time sensing including a filter which defines a hazard edge region within the hazard region, an evaluation unit which generates a first object signal when it determines that the TOF indicates that the laser pulses are reflected from within the hazard region, an intensity sensing means operable when the TOF indicates that the laser pulses are reflected from within the hazard edge region to perform intensity sensing of the laser pulses and to compare the intensity of the received laser pulses to a reference intensity stored in a memory unit and issue a second object signal in the event of deviation beyond a certain threshold value, wherein the evaluation unit issues a safety signal if either the first or the second object signal is positive.