Ge Healthcare Bio-sciences Ab

Fredrik Lars Jarhede

Hanno Ehring

Erik Nils Ostlund

Disclosed is an apparatus for measuring the absorbance of a substance in a solution, comprising: i) a sample cell () of known path length (b) for containing said solution (S), said cell being transparent to light of a predefined wavelength spectrum; ii) plural LED's each being independently operable by means of a controller () each for emitting light, within said predefined wavelength spectrum, along a light path; iii) a band pass filter () in the light path; iv) a beam splitter () for dividing light from said source propagating along the path into a first portion and a second portion, said first portion being directable by the beam splitter toward a reference detector () and said second portion being directable into the cell (); v) a reference detector () for detecting the intensity of said first portion of light directed by said beam splitter; and vi) a sample detector () for detecting the intensity of the second portion propagating from the cell; the apparatus allowing a sample in the cell to be inexpensively subjected to more than one wavelength of light for quicker or more accurate analysis.

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Uppsala, Sweden

Fredrik Lars Jarhede