in this paper we report the development of two attachments to a
commercial cell phone that transform the phone's integrated lens and
image sensor into a 350× microscope and visible-light spectrometer. The
microscope is capable of transmission and polarized microscopy modes and
is shown to have 1.5 micron resolution and a usable field-of-view of 150×150 with no image processing, and approximately 350×350 when post-processing is applied. The spectrometer has a 300 nm bandwidth with a limiting
spectral resolution of close to 5 nm. We show applications of the
devices to medically relevant problems. In the case of the microscope,
we image both stained and unstained blood-smears showing the ability to
acquire images of similar quality to commercial microscope platforms,
thus allowing diagnosis of clinical pathologies. With the spectrometer
we demonstrate acquisition of a white-light transmission spectrum
through diffuse tissue as well as the acquisition of a fluorescence
spectrum. We also envision the devices to have immediate relevance in
the educational field.
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