Device for separating non-solidified construction material from at least one real object constructed by means of a layer-by-layer addition and selective solidification of the construction material in the context of a generative construction process, which includes an electronic controller and a oscillation exciter (11, 12) controlled by the electronic controller, wherein the oscillation exciter (11, 12) is controlled by the electronic controller such that it excites the real object with at least one exciter frequency (f e) and/or with at least one exciter amplitude (A θ) two oscillations, in order in the context of a cleaning procedure to separate residual non-solidified construction material from the real object, wherein it furthermore comprises: a) a closed cleaning chamber, having a wall, in which chamber the object is arranged, in order to separate it in the context of the cleaning process from the residual non-solidified construction material, and b) a sensor apparatus which detects at least one characteristic variable of the oscillations of the real object and conducts it as an electrical signal into the electronic controller for evaluation, wherein c) the sensor apparatus c1) has at least one sensor (13a, 13b, 13d) arranged within or externally to the cleaning chamber and functioning according to a contactless measuring principle, characterised in that the sensor apparatus comprises at least one microphone, arranged within the cleaning chamber or externally to the cleaning chamber and functioning according to a contactless measuring principle, which detects the airborne sound which the vibrations of the real object directly or indirectly generate and converts them into a microphone signal as an electrical signal, and/or that c2) the sensor apparatus has at least one oscillation sensor arranged or fastened in or against a wall of the cleaning chamber, such that the oscillation sensor is able to detect the structure-borne sound to which the wall of the cleaning chamber is excited by means of the airborne sound which the real object, excited to oscillations, generates within the cleaning chamber. a) a closed cleaning chamber, having a wall, in which chamber the object is arranged, in order to separate it in the context of the cleaning process from the residual non-solidified construction material, and b) a sensor apparatus which detects at least one characteristic variable of the oscillations of the real object and conducts it as an electrical signal into the electronic controller for evaluation, wherein c) the sensor apparatus c1) has at least one sensor (13a, 13b, 13d) arranged within or externally to the cleaning chamber and functioning according to a contactless measuring principle, characterised in that the sensor apparatus comprises at least one microphone, arranged within the cleaning chamber or externally to the cleaning chamber and functioning according to a contactless measuring principle, which detects the airborne sound which the vibrations of the real object directly or indirectly generate and converts them into a microphone signal as an electrical signal, and/or that c2) the sensor apparatus has at least one oscillation sensor arranged or fastened in or against a wall of the cleaning chamber, such that the oscillation sensor is able to detect the structure-borne sound to which the wall of the cleaning chamber is excited by means of the airborne sound which the real object, excited to oscillations, generates within the cleaning chamber. c1) has at least one sensor (13a, 13b, 13d) arranged within or externally to the cleaning chamber and functioning according to a contactless measuring principle, characterised in that the sensor apparatus comprises at least one microphone, arranged within the cleaning chamber or externally to the cleaning chamber and functioning according to a contactless measuring principle, which detects the airborne sound which the vibrations of the real object directly or indirectly generate and converts them into a microphone signal as an electrical signal, and/or that c2) the sensor apparatus has at least one oscillation sensor arranged or fastened in or against a wall of the cleaning chamber, such that the oscillation sensor is able to detect the structure-borne sound to which the wall of the cleaning chamber is excited by means of the airborne sound which the real object, excited to oscillations, generates within the cleaning chamber.