Apparatus, sample cuvette and method for optical measurements
AssigneeRadiometer Medical A/S
InventorHenrik Fodgaard
Life of this patent
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Abstract
An apparatus, a sample cuvette and a method for optical measurements on samples which show variable levels of scattering are provided. The apparatus, sample cuvette and method may be used for optical measurements on biological, physiological and chemical samples, however, are especially applicable for optical measurements on whole blood.
Claims40
An apparatus for optical measurements on light scattering samples comprising at least one light emission means (12), a sample cuvette (15) with a sample chamber and a detecting means (19),
- the apparatus being characterised in that it comprises
- an absorption filter (18) which is positioned in the light path between the sample cuvette (15) and the detecting means (19), said absorption filter (18) has a center and a periphery and an absorbance which decreases from the center towards the periphery.
An apparatus according to 3, in which the detector (19) has a detector angular sensitivity defining a detector angular absorbance DAA(α′n) in the scattering angle range α′n and in which the sample has an effective optical pathlength defining a pathlength angular absorbance PAA(α′n) in the scattering angle range α′n, and in which the absorption filter (18) has an absorbance F(α′n)=ABSmax−(DAA(α′n)+PAA(α′n)), where ABSmax is the maximum absorbance of the absorption filter.
An apparatus for optical measurements on light scattering samples comprising at least one light emission means (12), a sample cuvette (15) with a sample chamber and a detecting means (19),
- the apparatus further being characterised in that it comprises
- an interference filter which is positioned in the light path between the sample cuvette (15) and the detecting means (19), and which is selected from the groups of band pass filters and long wavelength pass filters having a center wavelength and a cut-off wavelength, respectively, which are longer than the wavelength of the light from the light emission means, preferably longer by between 1 and 25%, more preferably between 5 and 20%, even more preferably between 10 and 20%.
A sample cuvette (15) for optical measurements on light scattering samples comprising a sample chamber and light entry and light exit windows (16), respectively, on the walls defining the sample chamber,
- the sample cuvette being characterised in that it comprises
- an absorption filter (18) as an integrated part of the sample cuvette (15), positioned on or into the exit window (16) of the sample cuvette (15), said absorption filter (18) has a center and a periphery and an absorbance which decreases from the center towards the periphery.
A sample cuvette (15) for optical measurements on light scattering samples comprising a sample chamber and light entry and light exit windows (16), respectively, on the walls defining the sample chamber,
- the sample cuvette being characterised in that it comprises
- an interference filter as an integrated part of the sample cuvette (15), positioned on or into the exit window (16) of the sample cuvette (15) and which is selected from the groups of band pass filters and long wavelength pass filters.
Dependencies are inferred from the claim text.