Detection of mixing ratio of two components in textile fiber structure

A device (1) for detecting the mixing ratio of two components (41, 42) in a textile fabric (4) comprises a radiation source (2) for emitting electromagnetic radiation (3) in the spectral band in the direction of the textile fibrous structure (4); a radiation sensor (8) for receiving at least a portion of the electromagnetic radiation (7); and a spectral filter (6) having spectral characteristics in the spectral band for filtering at least part of the electromagnetic radiation (5). The transmittance of the spectral filter (6) in the spectral band has at least one local maximum and one local minimum. The spectral characteristics of the spectral filter (6) in the spectral band are adapted to the spectral characteristics of the radiation source (2) and each of the two components (41, 24) such that the radiation intensity received by the radiation sensor (8) is a monotonic function of the mixing ratio of the two components (41, 42). The device (1) is simple in design, and an imaging radiation sensor (8) with a spa