Apparatus for contact-based simultaneous recording of autopod impressions

摘要

The invention relates to a device for the contact-based simultaneous recording of impressions of several perfused skin areas of human autopodia by means of disturbed total reflection. Viewed from the direction of a contacting skin area, the device comprises a protective body (103) of predetermined thickness with a bearing surface (102), wherein the bearing surface (102) has a size which allows the simultaneous application of several autopods. This is followed by a sensor layer (104) which comprises array-shaped, photosensitive sensor elements (201) for detecting light of at least one predetermined wavelength range, wherein passages (202) are arranged between the sensor elements (201) which are transparent to light of at least one predetermined illumination wavelength range , Finally, the device also includes a light guide (106) made of a transparent material for light of the predetermined illumination wavelength range material, wherein the light guide (106) is formed in the form of a plane-parallel plate. The plane-parallel plate has a lower large side (155) and a parallel arranged upper large side (156), which faces the sensor layer (104). The large sides (155, 156) are connected by a plurality of narrow sides, wherein one of the narrow sides is designed as a coupling surface (158) for illumination light, which is radiated by a light source (112) along a longitudinal direction of the coupling surface (158). According to the invention, the light source ( 112) light in a limited angular range about a preferred direction (113). The preferred direction (113) includes with the large sides (155, 156) an angle of incidence, which is predetermined so that light which is emitted in the angular range, after entering the light guide (106) on the large sides (155, 156) in If an adjacent medium with a refractive index of air would be totally reflected. Between the sensor layer (104) and the light guide (106) a mirror layer (105) is arranged, which reflects a part of the illumination light back into the light guide (106) and transmits another part of the illumination light. In this case, the device has means for homogenizing the illuminance of illuminating light, which passes through the upper large side (156) of the light guide (106) and impinges on the support surface (102). Additionally or alternatively, the device also comprises means for homogenizing a quantity of light to be detected as a function of the illuminance of the illuminating light striking the bearing surface (102) from the protective body (103), wherein the homogenization takes place as a function of the distance to the light source (112).