Device, household appliance and method for identifying substance groups in a fluid within a household appliance

A device for identifying substance groups in a fluid within a household appliance, comprising:

• an emission apparatus which emits a first electromagnetic radiation, characterized by an emission spectrum, into a test volume present with the fluid;
• a first measuring apparatus that detects a first spectrum of a second electromagnetic radiation directed in a forward direction and led out of the test volume present with the fluid;
• and
• an evaluation apparatus that is provided and designed to evaluate the first spectrum, which makes it possible to identify substance groups by using reference spectra,
• wherein the emission spectrum comprises a visible light wavelength range and an infrared radiation wavelength range, and
• wherein a plurality of different reference spectra are retrieved by the evaluation apparatus from a memory unit and/or from a server, wherein the reference spectra are produced in advance for each substance group to be detected and/or from a combination of different substance groups, wherein a typical reference spectrum is assigned to each substance group and/or combination of different substance groups, wherein the device further comprises at least one second measuring apparatus for detecting at least one second spectrum of a third electromagnetic radiation away from a forward direction, wherein the third electromagnetic radiation is generated by scattering of the first electromagnetic radiation by the substance groups to be identified, wherein the evaluation apparatus is provided and designed to evaluate the first spectrum and the at least one second spectrum, wherein substance groups can be identified by using a combination of the first spectrum and the at least one second spectrum, wherein the memory unit and/or the server comprise reference spectra for the first spectrum, as well as reference spectra of the substance groups to a respective second spectrum, and wherein the first spectrum is preferably evaluated from a combination of IR range, visible range and UV range.