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. Author manuscript; available in PMC: 2008 Apr 15.
Published in final edited form as: Biosens Bioelectron. 2006 Dec 5;22(9-10):2208–2215. doi: 10.1016/j.bios.2006.10.030

Figure 2.

Figure 2

Folded optical path. Mirrors and prisms are used to fold the optical path such that input and output optical paths are parallel to each other and to the sensing surface. Inset: The LED light source is translated across the focal plane of the collimating lens to change the angle of light exiting the collimator.