Apparatus, sample cuvette and method for optical measurements
First Claim
1. 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.
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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.
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Citations
40 Claims
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1. 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.
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11. 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%.
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26. 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.
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32. 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.
Specification