CPC G01N 21/6428 (2013.01) [G01N 21/645 (2013.01); G01N 21/33 (2013.01); G01N 21/6456 (2013.01); G01N 33/225 (2013.01); G01N 33/28 (2013.01); G01N 2021/135 (2013.01); G01N 2021/392 (2013.01); G01N 2021/6482 (2013.01); G01N 2021/6484 (2013.01); G01N 2201/129 (2013.01)] | 12 Claims |
1. A method comprising:
receiving a fluid sample by a sample holder defining an inner cavity configured to hold a sample and including a surface transparent to an excitation light source;
inducing fluorescence in the fluid sample by a light produced by a single-wavelength light source;
changing an angle of incidence between the surface of the sample holder and the light; and
detecting a change in fluorescence intensity by a detector as the angle of incidence is changed.
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