Patent ID: 8575549

Claim:
A machine tool monitoring device, comprising: a detection device ( 32 ) for detecting the presence of a type of material, in particular human tissue, in a machine tool area ( 34 ) via spectral evaluation of radiation (S), wherein the detection device ( 32 ) includes a sensor unit ( 50 ) having at least one sensitivity range ( 64 ) for detecting radiation in a wavelength range (WL 2 ) located at least partially in the infrared spectrum ( 72 ), wherein the detection device ( 32 ) includes a transmitting unit ( 48 ) which transmits radiation, a portion of which at the least is in the wavelength range (WL 2 ), and in at least one further wavelength range (WL 1 , WL 3 , WL 4 ), and wherein the radiation of the at least one further wavelength range (WL 1 ) is in the ultraviolet spectral range ( 68 ), and wherein the transmitting unit ( 48 ) transmits radiation in at least one wavelength range (WL 1 , WL 2 , WL 3 , WL 4 ) in a pulsed manner.