| 摘要 |
The invention provides a device for optically determining a concentration of alcohol and carbohydrates in a liquid sample (3). The device comprises at least a first and a second light source (7, 10) arranged for exposing the liquid sample (3) in a wavelength range between 750 nm and 1000 nm, a spectrometer (11) arranged to determine a first and a second light intensity by measuring the light from the first and the second light source (7, 10), a processing unit (13) which is connected to the spectrometer (11) and which is arranged to determine an absorption value of the liquid sample (3) from a comparison of the first and the second light intensity with a reference value. The processing unit (13) is further arranged to calculate the concentration of alcohol from the proportion of the absorption at a wavelength of less than 900 nm and the wavelength range between 900 nm and 920 nm, and to calculate the concentration of carbohydrates alcohol from the proportion of the absorption in the wavelength range between 750 nm and 900 nm and at a wavelength of 900 nm. The device in particular further comprises at least two polarization filters (5, 8) for filtering the light from the first light source (7), wherein the first polarization filter (5) is disposed between the first light source (7) and the liquid sample (3) and the second polarization filter (8) is disposed between the liquid sample (3) and the spectrometer (11). |
