Spectral sensing device and method for measuring optical radiation

A spectral sensing device for measuring optical radiation, comprising:

• at least one photosensitive detector, wherein the at least one photosensitive detector has at least one photosensitive region designated for receiving optical radiation, wherein at least one detector signal as generated by the at least one photosensitive detector is dependent on an illumination of the at least one photosensitive region;
• at least one radiation emitting element, wherein the at least one radiation emitting element is designated for emitting the optical radiation;
• at least one optical element, wherein the at least one optical element is designated to guide a first portion of the optical radiation to the at least one photosensitive detector, wherein the at least one optical element is or comprises at least one beam splitter;
• and
• at least one evaluation unit, wherein the at least one evaluation unit is configured to perform a calibration of the spectral sensing device by using at least one first detector signal as generated by the at least one photosensitive detector upon the illumination of the at least one photosensitive region by the first portion of the optical radiation, wherein the calibration refers to a process of correcting from time to time drifting effects occurring in the spectral sensing device, wherein the drifting effects are caused by alterations related to the spectral sensing device itself or having an effect onto the spectral sensing device.