Verification of the operability of a laser scanner

A laser scanner device having a computing unit and a laser scanner, wherein:

• the laser scanner has a housing with a light-transmissive window, a transmitter unit for emitting laser signals which is arranged within the housing, a control unit, a movable deflection unit for deflecting the laser signals, and a detector unit arranged within the housing;
• the control unit is configured to drive the transmitter unit such that the transmitter unit transmits at least one test signal during a test phase, and to drive the deflection unit in such a way that the deflection unit is aligned vis-à-vis the transmitter unit during the test phase so that the at least one test signal is not directed at the window;
• wherein the detector unit has at least two optical detectors which are configured to record components of the at least one test signal and to generate at least two detector signals on the basis of the detected components;
• and
• the computing unit is configured to determine a pulse width for each of the at least two detector signals and to calculate a sum of the determined pulse widths and
• to check a functionality of the transmitter unit and/or detector unit on the basis of the sum.