Patent ID: 7289217

Claim:
An optical device for fluorometry to monitor a biological sample, the device comprising: a first filter to condition an excitation light directed at a sample region; a beamsplitter positioned along a first optical axis, the first optical axis being an optical axis of the excitation light, and the beamsplitter positioned along a second optical axis, the second optical axis being an optical axis of an emission light; and a first optical element positioned along the second optical axis to collimate the emission light and to reduce non-uniformities in the emission light prior to the emission light impinging the beamsplitter, wherein the first optical element comprises a plurality of lenses, and wherein the first optical element is positioned proximate to the sample region comprising a plurality of wells, and further wherein each of the plurality of lenses being proximate to a corresponding well, and wherein a numerical aperture of each of the plurality of lenses depends on a position of the corresponding well.