Saferange

A device adapted for monitoring a relatively large area in order to detect if an undesired object is present within the area, wherein the device includes a laser , which is adapted to emit a laser beam of a determined wavelength over the area, a photo sensor, which is arranged to receive a reflected part of the laser beam and to generate a signal depending of the reflected part of the laser beam , and an evaluation unit, which is arranged to process the generated signal in order to determine if an undesired object is present within the area, characterised in that said laser is adapted to emit a laser beam which has a wavelength longer than or equal to 1200 nm.  The device is arranged to scan the laser beam over the area in such a way that substantially the whole area is subjected to the laser beam during one scan. The evaluation unit is arranged to compare the generated signal to a reference signal and to establish that an object is present within the area if the generated signal deviates from the reference signal with a minimum predetermined value.