The measurement of gloss is based on reflection of light sent to the skin. Parallel white light is created by LEDs in the probe head. To be able to emit light at 60° in a relatively small and uniquely designed measurement head, light is sent out at 0° and reflected by a mirror to 60°. Two separate measurement channels measure the reflected light. Direct reflection/gloss: the direct reflected light is again guided by a mirror in 60° into the reflection channel (blue). Diffuse reflected/scattered light: The scattered/diffuse reflected light is measured at 0° (completely vertically above the measured surface) under the assumption that light is scattered in the same way over all degrees (diffuse channel - red).So the Skin-Glossymeter GL 200 expresses both, the portion of directly reflected light (gloss) and the diffuse scattered portion from the skin surface.
Diffuse Scattering Correction (DSC): Skin varies in structure and brightness and also in colour. On the skin some part of the light will penetrate into the upper layers and will get scattered depending mainly on the skin colour (dark skin scatters less then light skin). To obtain a gloss value mostly free from the influence of skin colour, the diffuse light entering the gloss channel is deducted by a special formula. No other gloss measurement offers such a function.
The results are expressed in (arbitrary) Glossymeter units (excellent correlation with industrial standard units GU based on DIN and ISO).
Dimensions: 13 cm x Ø 2.4 cm, Cable length: approx. 1.3 m, Measuring area: 2.5 mm x 5 mm, Weight: 85 g incl. probe cable
Measurement principle: reflectance, Light: white LED, emittance at 60°, reflection measurement at 60°, diffuse reflectance measurement at 90°
Units: Glossymeter units (excellent correlation with industrial standard units GU based on DIN and ISO), Measurement uncertainty: ± 5%
For the technical data of the wireless probe, please see Basic Probe Systems.Technical changes may be made without prior notice.